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6 Air conditioning V3 MR-366-X84-62A000$TOC.mif V3 62A "The repair procedures given by the manufacturer in this document are based on the technical specifications current when it was prepared. The procedures may be modified as a result of changes introduced by the manufacturer in the production of the various component units and accessories from which his vehicles are constructed." V3 All rights reserved by Renault s.a.s. Edition Anglaise Copying or translating, in part or in full, of this document or use of the service part reference numbering system is forbidden without the prior written authority of Renault s.a.s. © Renault s.a.s. 2009 AIR CONDITIONING Manual air conditioning and Climate control ABBREVIATIONS 62A - 2 Fault finding – Introduction 62A - 3 Fault finding – Function layout 62A - 9 Fault finding – Mode of operation 62A - 10 Fault finding – Configurations and configuration reading 62A - 18 Fault finding – Conformity check 62A - 19 Fault finding – Customer complaints 62A - 45 Fault finding – Fault Finding Chart 62A - 47

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Page 1: Megane Aircondition

6 Air conditioning

V3MR-366-X84-62A000$TOC.mifV3

62A

"The repair procedures given by the manufacturer in this document are based on the technical specifications current when it was prepared.

The procedures may be modified as a result of changes introduced by the manufacturer in the production of the various component units and accessories from which his vehicles are constructed."

V3

All rights reserved by Renault s.a.s.

Edition Anglaise

Copying or translating, in part or in full, of this document or use of the service part reference numbering system is forbidden without the prior written authority of Renault s.a.s.

© Renault s.a.s. 2009

AIR CONDITIONING

Manual air conditioning and Climate control

ABBREVIATIONS 62A - 2Fault finding – Introduction 62A - 3Fault finding – Function layout 62A - 9Fault finding – Mode of operation 62A - 10Fault finding – Configurations and configuration

reading 62A - 18Fault finding – Conformity check 62A - 19Fault finding – Customer complaints 62A - 45Fault finding – Fault Finding Chart 62A - 47

Page 2: Megane Aircondition

62A - 2

AIR CONDITIONINGABBREVIATIONS 62A

V3

Manual air conditioning and

Climate control

ABBREVIATIONS MEANING OF ABBREVIATION

ABS Anti-lock braking system

ALP Fault finding chart

APC After ignition

AVC Before ignition feed

BVA Automatic gearbox

BVM Manual gearbox

BVR Sequential gearbox

CAN Controller Area Network

AC Air conditioning

CD Compact disc

PAS Power assisted steering (hydraulic)

DAE Electric power assisted steering

DVD Digital versatile disc

DTC Fault finding code

EGR Exhaust gas recirculation

ESP Electronic Stability Program

GMV Fan assembly

CNG Compressed natural gas

LPG Liquefied petroleum gas

HLE High yield strength

MAG Metal active gas (for welding steel)

MIG Metal inert gas (for welding aluminium)

MR Workshop repair manual

TN Technical Note

OBD On board diagnostics

SER Resistance spot welding

SSPP Tyre pressure monitoring system

THLE Very high-tensile strength

TM Labour time

UCH UCH

UPC Protection and switching unit

UCT Roof control unit

UHLE Ultra high yield strength

VIN Vehicle identification number

162AAIR CONDITIONINGABBREVIATIONS

MR-366-X84-62A000$010.mif

Page 3: Megane Aircondition

62A - 3

AIR CONDITIONINGFault finding – Introduction 62A

V3

Manual air conditioning and

Climate control

162AAIR CONDITIONINGFault finding – Introduction

1. SCOPE OF THIS DOCUMENT

This document presents the fault finding procedure applicable to all computers with the following specifications:

2. PREREQUISITES FOR FAULT FINDING

Documentation type:

Fault Finding Procedures (this document and the technical notes for the injection fitted to the vehicle, the Passenger Compartment Central Unit (UCH) and the Protection and Switching Unit):– Assisted fault finding (integrated into the diagnostic tool), Dialogys.

Wiring Diagrams:– Visu-Schéma (CD-ROM), paper version.

Diagnostic tools type:

– CLIP

Type of special tooling required:

3. RECAP

Faults:

There are faults which are displayed and stored present faults (which occurred in certain circumstances and which still exist) and stored faults (which occurred in certain circumstances and have since disappeared or which are still present but not detected in the present context).The present or stored status of faults must be considered when using the diagnostic tool after switching on + after ignition (without activating any system components).Present faults must be dealt with according to the procedure specified in the Interpretation of faults section.For a stored fault, note the faults displayed and follow the instructions shown in the Notes section.If the fault is confirmed when the instructions in the Notes section are applied, the fault is present. In this case, deal with the fault.If the fault is not confirmed, carry out basic checks. Check:– The electric lines on which there is a fault;– The connectors on these lines (corrosion, bent pins, etc.);– The resistance of the faulty component;– The condition of the wires (insulation melted or cut, chafing, etc.).

Vehicle: Mégane II

Function concerned: Air conditioning

SPECIAL TOOLING REQUIRED

Multimeter

Elé. 1681 Universal bornier

CLIM X84 1.1

Edition 3MR-366-X84-62A000$020.mif

Page 4: Megane Aircondition

62A - 4

AIR CONDITIONINGFault finding – Introduction 62A

V3

Manual air conditioning and

Climate control

Conformity check

The aim of the conformity check is to check statuses and parameters that do not produce a fault display on the diagnostic tool when they are inconsistent. Therefore, this phase is used to:– carry out fault finding on faults that do not have a fault display, and which may correspond to a customer complaint.– check that the system is operating correctly and that there is no risk of a fault recurring after repairs.

This section features the fault finding procedures for statuses and parameters, and the conditions for checking them.

If a status is not behaving normally or a parameter is outside the permitted tolerance values, consult the corresponding fault finding page.

Notes about the conformity check for the climate control system:

The air conditioning system conformity check is divided into four parts. The parts relate to the four air conditioning sub-functions, heater, cold loop, user selection and passenger compartment ventilation.

The statuses and parameters related to these sub-functions are listed with their respective computers.

N.B.: the manual air conditioning control panel does not control electrical components and cannot be subjected to fault finding. Therefore, there is no conformity check in the 62C Manual air conditioning section.

Note: The interpretation of statuses, parameters and commands is also split into several sections. Everything controlled by the air conditioning control panel is explained in the two Air conditioning sections, 62A and 62B. On the other hand, signals from other computers are explained in the Fault finding sections for these computers (see the conformity check).

Customer complaints - Fault finding chart

If the diagnostic tool check is correct, but the customer complaint persists, the fault should be dealt with according to the customer complaint.

A summary of the general procedure to follow is provided on the following page in the form of a flowchart.

CLIM X84 1.1

Edition 3MR-366-X84-62A000$020.mif

Page 5: Megane Aircondition

62A - 5

AIR CONDITIONINGFault finding – Introduction 62A

V3

Manual air conditioning and

Climate control

4. FAULT FINDING PROCEDURE

Check the battery charge and the condition of the fuses

Print the system fault finding log (available on CLIP and in the Workshop Repair Manual or

Technical Note)

Connect CLIP

Dialogue with Electronic Control Unit?

no

yes

Read the faults

Faults present

no

yes

Deal with present faults

Deal with stored faults

The cause is still present

no Fault solved

yes

See Fault Finding Chart 1

Conformity check

The cause is still present

no Fault solved

Use the fault finding charts

The cause is still present

no Fault solved

Contact Techline with the completed fault finding log

CLIM X84 1.1

Edition 3MR-366-X84-62A000$020.mif

Page 6: Megane Aircondition

62A - 6

AIR CONDITIONINGFault finding – Introduction 62A

V3

Manual air conditioning and

Climate control

All faults requiring replacement of a computer must have a thorough fault finding procedure performed on them, using the appropriate tools. The fault finding log, which must be filled in during fault finding, makes dialogue with the manufacturer more constructive by providing: faster and more relevant Techline assistance; better analysis of the approval request and more likelihood that the replacement of parts will be accepted; clearer statement of your observations for the warranty reimbursement form.

6. SAFETY ADVICE

All work on components requires the observation of safety rules to prevent damage or injury:– Make sure the battery is properly charged to avoid damaging the computers with a low load.– Do not smoke.– Use the appropriate tools.

IMPORTANT!

5. FAULT FINDING LOG

IMPORTANT: For any reimbursement for a monitored part (computer type) or call to Techline, you will be asked for a correctly completed fault finding log. This makes it possible to keep track of your fault finding.

IT IS THEREFORE COMPULSORY TO COMPLETE A FAULT FINDING LOG EVERY TIME A FAULT FINDING PROCEDURE IS PERFORMED.

CLIM X84 1.1

Edition 3MR-366-X84-62A000$020.mif

Page 7: Megane Aircondition

List of monitored parts: Computer

FAULT FINDING LOGSystem: Air conditioning

Page 1/2

Administrative identification

Date 2 0

Log completed by

VIN

Engine

Diagnostic tool CLIP

Update version

Customer complaint

1127 No warm air 1129 Faulty air distribution 1130 Incorrect temperature setting

1128 No cold air 1125 Heating/air conditioning: ventilation

1182 Heating/air conditioning: demisting

Other Your comments:

Conditions under which the customer complaint occurs

011 When ignition is switched on

005 While driving 004 Intermittently

010 Gradual deterioration

012 When the air conditioning is switched on

009 Sudden fault

Other Your comments:

Documentation used in fault finding

Fault finding procedure used

Type of diagnostic manual: Workshop Repair Manual Technical Note Assisted fault finding

Fault finding manual no:

Wiring diagram used

Wiring Diagram Technical Note No:

Other documentation

Title and/or part number:

FD 04Fault finding log

page to print or photocopy - page to print or photocopy - page to print or photocopy

Page 8: Megane Aircondition

To be read with the diagnostic tool (Identification screen):

FAULT FINDING LOGSystem: Air conditioning

Page 2/2

Computer identification and system parts replaced

Part 1 part no.

Part 2 part no.

Part 3 part no.

Part 4 part no.

Part 5 part no.

Computer part no.

Supplier no.

Program no.

Software version

Calibration no.

VDIAG

Faults found with the diagnostic tool

Fault no. Present Stored Fault name Specification

Conditions under which fault occurs

Status or parameter no. Parameter name Value Unit

External temperature

Internal temperature

Refrigerant pressure

System-specific information

Description:

Additional information

What factors led you to replace the computer?What other parts were replaced?

Other defective functions?

Your comments:

FD 04Fault finding log

page to print or photocopy - page to print or photocopy - page to print or photocopy

Page 9: Megane Aircondition

62A - 9

AIR CONDITIONINGFault finding – Function layout 62A

V3

Manual air conditioning and

Climate control

AIR CONDITIONINGFault finding – Function layout

CLIM X84 1.1

Edition 3

Air conditioning system layout

The air conditioning system uses four computers. The four computers are connected by the multiplex system, except in the case of manual air conditioning, where the connection between the air conditioning control panel and the passenger compartment central unit (UCH) is by normal wiring.

The air conditioning control panel interprets the driver's wishes and transmits them to the other computers; it also manages the passenger compartment ventilation, air distribution, air mixing and air recirculation.

The Passenger Compartment Control Unit (UCH) transmits the request to engage the air conditioning compressor to the injection and controls the operation of the passenger compartment heating resistors (RCH).

The injection receives the refrigerant fluid pressure signal from the pressure sensor. The injection computer authorises or inhibits the request to engage the compressor depending on how the vehicle is operating and transmits the signal to the Protection and Switching Unit (UPC).

The role of the UPC is to manage the power section of the air conditioning system. It controls the engagement of the compressor, the engine cooling fan assemblies and the heated rear screen.

GLOSSARY:RCH = Passenger compartment heating resistor

AC control panel UCH

– interpretation of driver's wishes– passenger compartment

ventilation management– air distribution management– air mixing management

– passenger compartment heating resistors' operation management

UPC (Power and Switching Unit)

Injection computer

– engine unit management– compressor control– heated rear screen control

– air conditioning authorisation

MR-366-X84-62A000$030.mif

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62A - 10

AIR CONDITIONINGFault finding – Mode of operation 62A

V3

Manual air conditioning and

Climate control

AIR CONDITIONINGFault finding – Mode of operation

General operation

The air conditioning system is composed of four sub-functions: heating, cold loop, passenger compartment ventilation and user selection. Fault finding on the air conditioning is performed in two different ways using the diagnostic tool.The first procedure is by computer fault finding which makes it possible to communicate with just one computer (select the computer concerned). The second procedure consists of performing fault finding on each function which allows communication with all four computers of the AIR CONDITIONING function.

Description of the sub-functions

Heater sub-function: this sub-function includes everything relating to the production of warm air in the vehicle and management of the heated rear screen.The main computers involved are the air conditioning computer (air mixing and blown air setting) and the UCH (control and management of the passenger compartment heating resistors). The Protection and Switching Unit controls the heated rear screen (and heated door mirror). The injection computer is only included in this sub-function to supply the signals required for its management.

Cold loop sub-function: this sub-function includes everything involved in the vehicle's production of cold air.The computers concerned are the air conditioning computer for air mixing, the injection computer to authorise compressor engagement and the UPC to control the compressor and the engine fan assemblies. With climate control systems, the UCH merely transmits the request to engage the compressor from the air conditioning computer to the injection computer.With manual air conditioning, the UCH authorises or inhibits sending the request to engage the compressor from the air conditioning computer to the injection computer depending on the status of the passenger compartment blower (with manual air conditioning, the UCH receives and manages the passenger compartment blower speed signal: compressor engagement is inhibited if the blower is not running).

User selection sub-function: this sub-function includes everything used to transmit the user's requests (pressing buttons). The computers concerned are the air conditioning computer for climate control systems and the UCH. The two other computers are not used for manual air conditioning.

Passenger compartment ventilation sub-function (climate control systems only): this sub-function includes everything involved in ventilation, air mixing, air recirculation and air distribution. Therefore, only the air conditioning computer is involved.

CLIM X84 1.1

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Page 11: Megane Aircondition

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AIR CONDITIONINGFault finding – Mode of operation 62A

V3

Exchanges between the four air conditioning system computers

– air conditioning request 1 (compressor engagement)

– switch on passenger compartment heating resistors (RCH) request

– switch on heated rear screen request (+ electric door mirrors)

– passenger compartment ventilation signal

Climate control panelUCH

– passenger compartment heating resistors (RCH) operation management

– external temperature signal– engine coolant temperature signal

– switch on heated rear screen request (+ electric door mirrors)

UCHUPC

(Power and Switching Unit)

– alternator charge signal– number of passenger compartment heating

resistors authorised by alternator

– air conditioning request 2 (compressor engagement)

– fast idle request for passenger compartment heating resistors (RCH)

UCH Injection computer

– compressor engagement authorisation– engine coolant temperature signal– refrigerant fluid pressure signal– number of passenger compartment heating

resistors authorised by injection

– compressor engagement request– switch on engine cooling fan assembly request

Injection computerUPC

(Power and Switching Unit)

– alternator charge signal

Manual air conditioning and

Climate control

CLIM X84 1.1

Edition 3MR-366-X84-62A000$040.mif

Page 12: Megane Aircondition

62A - 12

AIR CONDITIONINGFault finding – Mode of operation 62A

V3

Manual air conditioning and

Climate control

Summary diagram of components controlled or managed by the climate control computer

Ventilation and air conditioning control unit

Passenger compartment

blower Vehiclemultiplex

network

Passenger compartment blower power

moduleRecirculation

motorDistribution

motorAir mixing

motorInternal

temperature sensor

Solar radiation sensor

Actuator control Sensor management

Climate control computer (control panel)

Climate control management (hot and cold)

User requests management

(buttons pressed)

Button lighting

Key:Wire connections = Multiplex connections =

CLIM X84 1.1

Edition 3MR-366-X84-62A000$040.mif

Page 13: Megane Aircondition

62A - 13

AIR CONDITIONINGFault finding – Mode of operation 62A

V3

Summary diagram of components controlled or managed by the manual air conditioning computer

Ventilation and air conditioning unit

Passenger compartment

blower

Resistor unit

Recirculation flap

Distribution flap

Mixing flap Vehicle

multiplexnetwork

Actuator control

Manual air conditioning computer (control panel)

Switch lights (air conditioning button and heated rear screen button)

Passenger compartment blower

operation signal (running or stopped)

User request management (air conditioning button and heated rear screen button pressed)

UCH Transmission of requests (air conditioning,

heated rear screen)

Key:Wire connections = Multiplex connections = Mechanical connections = (control cables)

Manual air conditioning and

Climate control

CLIM X84 1.1

Edition 3MR-366-X84-62A000$040.mif

Page 14: Megane Aircondition

62A - 14

AIR CONDITIONINGFault finding – Mode of operation 62A

V3

Summary diagram of components controlled or managed by the control panel of heater versions without air conditioning

Ventilation unit

Passenger compartment

blower

Resistor unitRecirculation

flapDistribution

flapMixing flap

Vehicle multiplexnetwork

Actuator control

user control panel

Switch lights (heated rear screen button)

Passenger compartment blower

operation signal (running or stopped)

User request management (heated rear screen button pressed)

UCH Transmission of the request to switch on the heated rear

screen

Key:Wire connections = Multiplex connections = Mechanical connections = (control cables)

Manual air conditioning and

Climate control

CLIM X84 1.1

Edition 3MR-366-X84-62A000$040.mif

Page 15: Megane Aircondition

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AIR CONDITIONINGFault finding – Mode of operation 62A

V3

Manual air conditioning and

Climate control

CLIM X84 1.1

Edition 3

Summary diagram of components controlled or managed by the UCH

Summary diagram of components controlled or managed by the Protection andSwitching Unit

Relay No.2 for the Passenger Compartment

Heating resistors

Relay No.1 for the Passenger Compartment

Heating resistors

Relay No. 3 for the Passenger Compartment

Heating resistors (only for Scénic)

External temperature

sensor

Vehiclemultiplex

network

Actuator control Sensor management

UCH

Air conditioning request management

Heated rear screen control management

Passenger compartment heating resistor control

management

Engine cooling fan assembly

Heated rear screen and heated door

mirrors

Air conditioning compressor

Alternator: DF terminal

Actuator control Electrical availability management

UPC

DF terminal signal formatting (alternator charging)

Key:Wire connections = Multiplex connections =

MR-366-X84-62A000$040.mif

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AIR CONDITIONINGFault finding – Mode of operation 62A

V3

Manual air conditioning and

Climate control

Summary diagram of components controlled or managed by the injection computer

Refrigerant fluid pressure sensor

Engine coolant temperature

sensor

Vehiclemultiplexnetwork

Sensor management

Engine injection computer

Management of the cold loop (refrigerant fluid pressure, switch on engine cooling fan request, compressor

engagement authorisation, etc.)

Passenger compartment heating resistors (RCH)

authorised power management

Key:Wire connections = Multiplex connections =

CLIM X84 1.1

Edition 3MR-366-X84-62A000$040.mif

Page 17: Megane Aircondition

62A - 17

AIR CONDITIONINGFault finding – Mode of operation 62A

V3

Manual air conditioning and

Climate control

Key:

Multiplex signals.

Wire connections.

CLIM X84 1.1

Edition 3

Compressor control flowchart

ET143 Air conditioning request 1 (climate control)

Climate control panel ET029 Air conditioning button (manual air conditioning)

ET030 Air conditioning request 2

UCH

ET088 compressor engagement request

Injection computerET004 Air conditioning authorisation

UPC (Power and Switching Unit)

Control via wire connection

Special notes:This flowchart shows the tracks of the compressor engagement request. Components which may block this request are not listed (passenger compartment blower operation signal for the UCH on manual air conditioning version, correct refrigerant fluid pressure for the injection, etc.).If the compressor does not engage (one of the requests is not transmitted): carry out a conformity check.

Air conditioning compressor

MR-366-X84-62A000$040.mif

Page 18: Megane Aircondition

AIR CONDITIONING 62A

62A - 18V3

Manual air conditioning and

Climate control

AIR CONDITIONINGFault finding – Configurations and configuration reading

Air conditioning system configurations

Air conditioning system configuration readings

Computers Configuration Option Comment

Air conditioning (climate control computers only)

CF044 Vehicle type B84/L84/J84/E84 Manual configuration (with CLIP)

CF117 Type of heating resistor

Without/1000 W/1800 W

UCH SC008 Type of Passenger Compartment Control Unit

Configuration situation (possible to register all the UCH functions).

Injection (all types)X X

Automatic computer configuration

Protection and switching unit

CF001 Type of alternator – KCB1 90 BOSCH– TG11 110 VALEO– SG12 VALEO– LIE8 150 BOSCH– SG15L VALEO– Other type

Manual configuration (with CLIP)

Computers Configuration reading Option Comment

Air conditioning LC013 Vehicle type B84/J84/E84 None

LC043 Heating resistor without/1000 W/1800 W

UCH LC013 Type of air conditioning climate control/manual/heating

None

LC030 Type of heating resistorwithout/1000W/1500W

LC011 Vehicle type All except E8h

S3000 injection

N.B. These functions are only valid for the S3000 injection (K4J / K4M / F4R and F4R Turbocharged engines

LC009 Air conditioning connected/not connected

Following the first compressor engagement request:LC009 connectedLC016 With

LC016 Air conditioning pressure signal management

with/without

ET079 Air conditioning present yes/no ET079

LC025 Heating resistor with/without None

Protection and switching unit

LC001 Type of alternator – KCB1 90 BOSCH– TG11 110 VALEO– SG12 VALEO– LIE8 150 BOSCH– SG15L VALEO– Other type

None

CLIM X84 1.1

Edition 3MR-366-X84-62A000$050.mif

Page 19: Megane Aircondition

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AIR CONDITIONINGFault finding – Conformity check 62A

V3

Manual air conditioning and

Climate control

AIR CONDITIONINGFault finding – Conformity check

Sub-function: cold loop

NOTES

Only carry out this conformity check after a full check with the diagnostic tool (fault reading and configuration checks).Test conditions: ignition on (12 volts APC), engine stopped, AIR CONDITIONING SWITCHED OFF (passenger compartment blower switched off and air conditioning compressor not engaged).Note: Read the parameters when the vehicle is cold (in the morning) to check the conformity of the temperature parameters (without thermometer). The temperatures should be approximately equal (internal, external and engine coolant).Fault finding procedures for the statuses, parameters and commands listed in this check are explained in the technical notes relating to the computer which generates the signal (see the Introduction section).

Computer (signal generator)

Parameter or status check or action

Display and Notes Fault finding

Climate control

ET143: Air conditioning request 1.

ACTIVE for air conditioning request (AC button pressed

or AUTO button pressed with maximum cold

request).INACTIVE otherwise.

Note: This status is only valid for climate control

systems.

If there is a fault, refer to the fault finding procedure

for this status.Note: This status

represents the request from the air conditioning

computer to the UCH to engage the compressor (refer to the flowchart in

the General operation section).

PR001: Internal temperature.

X = internal temperature ± 5 ˚C

(invalid value: 87.5 ˚C)

If there is a fault, refer to the fault finding procedure

for this parameter.

ET141: Passenger compartment blower.

STOPPED(according to test

conditions: see Notes).

If there is a fault, refer to the fault finding procedure

for this status.Note: This status is only

operative for climate control systems.

PR012: Mixing flap position.

0 % = Max. cold position (15 ˚C)

100 % = Max. hot position (27 ˚C)

If there is a fault, refer to the fault finding procedure

for this parameter.

PR006: Solar radiation. 0 watts (no sunlight) to 400 watts (maximum

sunlight).

If there is a fault, refer to the fault finding procedure

for this parameter.

CLIM X84 1.1

Edition 3MR-366-X84-62A000$060.mif

Page 20: Megane Aircondition

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AIR CONDITIONINGFault finding – Conformity check 62A

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Manual air conditioning and

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Sub-function: cold loop (continued 1)

Computer (signal generator)

Parameter or status check or action

Display and Notes Fault finding

UCH

ET030: Air conditioning request 2.

INACTIVE(engagement of the compressor is only

authorised when the engine is running).

If there is a fault, refer to the fault finding procedure

for this status.Note: This status

represents the request from the UCH to the injection computer to engage the compressor (refer to the flowchart in the General

operation section).

PR002: External temperature.

X = external temperature ± 5 ˚C

(invalid value: 215 ˚C)

If there is a fault, refer to the fault finding procedure

for this parameter.

ET015: Passenger compartment blower.

INACTIVE(according to test

conditions: see Notes).

If there is a fault, refer to the fault finding procedure

for this status.Note: This status is only operative for manual air

conditioning (and heater versions without air

conditioning).

ET091: Engine running: NONote: This status is

displayed by the UCH but is generated by the injection

computer.

If there is a fault, refer to the fault finding procedure

for this status.(Injection Technical Note).

Injection

ET079: Air conditioning present.

YES(automatic injection

computer configuration).

If the status displays NO, refer to the fault finding

procedure for this status.

PR064: Coolant temperature.

X = engine coolant temperature.

If there is a fault, refer to the fault finding procedure

for this parameter.

ET004: Air conditioning authorisation.

NO(no authorisation with

engine stopped).

If there is a fault, refer to the fault finding procedure

for this status.

CLIM X84 1.1

Edition 3MR-366-X84-62A000$060.mif

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AIR CONDITIONINGFault finding – Conformity check 62A

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Manual air conditioning and

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Sub-function: cold loop (continued 2)

Computer (signal generator)

Parameter or status check or action

Display and Notes Fault finding

Injection(continued 1)

ET088: Compressor activation request.

INACTIVE(engagement of the compressor is only

authorised when the engine is running).

If there is a fault, refer to the fault finding procedure

for this status.Note: This status

represents the request from the injection computer to

the Protection and Switching Unit to engage

the compressor (refer to the flowchart in the General

operation section).

PR089: Vehicle speed. 0 mph or km/h If there is a fault, refer to the fault finding procedure

for this parameter.

PR055: Engine speed. 0 rpm. If there is a fault, refer to the fault finding procedure

for this parameter.

ET023: Fast idle request (except EDC 16 injection).

ABSENT If there is a fault: refer to the fault finding procedure

for this status.Note: This status is not displayed by the EDC16 injection (F9Q engine).

PR053: Engine speed requested by air conditioning (except S3000 and DDCR injections).

0 rpm. If there is a fault, refer to the fault finding procedure

for this parameter.Note: This parameter is only displayed by the

EDC16 injection (F9Q engine).

PR037: Refrigerant pressure.

1 bar < X < 15 bar If there is a fault, refer to the fault finding procedure

for this parameter.

PR125: Power absorbed by air conditioning compressor.

0 W < X < 300 W(ambient temperature

23 ˚C)

If there is a fault, refer to the fault finding procedure

for this parameter.

CLIM X84 1.1

Edition 3MR-366-X84-62A000$060.mif

Page 22: Megane Aircondition

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AIR CONDITIONINGFault finding – Conformity check 62A

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Sub-function: cold loop (continued 3)

Computer (signal generator)

Parameter or status check or action

Display and Notes Fault finding

Injection(continued 2)

ET022: Low-speed fan assembly request (except 3000 injection)

INACTIVENote: This status is not displayed by the S3000

injection (K4J, K4M, F4R and F4RT engines).

If there is a fault, refer to the fault finding procedure

for this status.– For more information

(Control of Fan 1 or Fan 2 according to vehicle speed and refrigerant fluid pressure), refer to the HELP section (62B).

ET021: High-speed fan assembly request (except S3000 injection).

INACTIVENote: This status is not displayed by the S3000

injection (K4J, K4M, F4R and F4RT engines).

If there is a fault, refer to the fault finding procedure

for this status.– For more information

(Control of Fan 1 or Fan 2 according to vehicle speed and refrigerant fluid pressure), refer to the HELP section (62B).

ET014: Fan assembly 1 check (except DDCR injection).

STOPPED If there is a fault, refer to the fault finding procedure

for this status.Note: This status is not displayed by the DDCR injection (K9K engine).

ET015: Fan assembly 2 check (except DDCR injection).

STOPPED If there is a fault, refer to the fault finding procedure

for this status.Note: This status is not displayed by the DDCR injection (K9K engine).

CLIM X84 1.1

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Sub-function: cold loop (continued 4)

Computer (signal generator)

Parameter or status check or action

Display and Notes Fault finding

Protection and Switching Unit

ET007: High-speed fan control.

INACTIVE(On Mégane saloons and

coupes this status is always ACTIVE: ignore it).

If there is a fault, refer to the fault finding procedure

for this status.Note: This status is only

operative on Mégane Scénics (2 engine cooling

fans and Fan 2 relay outside the UPC).

AC008: Compressor control.

Command for testing the operation of the air

conditioning compressor clutch.

If there is a fault, consult the fault finding procedure

for this command.Note: The UPC cannot test

the compressor control circuit; this command is the

only way to test its operation.

AC009: Low-speed fan assembly.

Command for testing the low speed operation of the

engine cooling fan assembly (Fan 1).

If there is a fault, consult the fault finding procedure

for this command.Note: The UPC cannot test the control circuit for fan 1; this command is the only way to test its operation.

AC010: High-speed fan assembly

Command for testing the high speed operation of the engine cooling fan

assembly (Fan 2).

If there is a fault, consult the fault finding procedure

for this command.Note: On Mégane saloons

and coupes the UPC cannot test the control circuit for Fan 2; this

command is the only way to test its operation.

On Mégane Scénics, the Fan 2 control relay is

outside the UPC and its control line is tested by (DF002 High-speed fan assembly relay control

circuit).

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Sub-function: heater

NOTES

Only carry out this conformity check after a full check with the diagnostic tool (fault reading and configuration checks).Test conditions: ignition on (12 volts APC), engine stopped, AIR CONDITIONING SWITCHED OFF (passenger compartment blower switched off and air conditioning compressor not engaged).Note:Read the parameters when the vehicle is cold (in the morning) to check the conformity of the temperature parameters (without thermometer). The temperatures should be approximately equal (internal, external and engine coolant). Fault finding procedures for the statuses, parameters and commands listed in this check are explained in the technical notes relating to the computer which generates the signal (see the Introduction section).

Computer (signal generator)

Parameter or status check or action

Display and Notes Fault finding

Climate control

ET086: Heated rear screen: manual mode.

ACTIVE: De-icing button at the bottom of the

control panel pressed.INACTIVE otherwise.

If there is a fault, refer to the fault finding procedure

for this status.

ET085: Heated rear screen: auto mode.

ACTIVE: De-icing button at the top of the

control panel pressed ("See clear" function).INACTIVE otherwise.

If there is a fault, refer to the fault finding procedure

for this status.

PR121: Blown air temperature setting.

0 < X < 80 ˚C. If there is a fault, refer to the fault finding procedure

for this parameter.

PR001: Internal temperature.

X = internal temperature ± 5 ˚C

(invalid value: 87.5).

If there is a fault, refer to the fault finding procedure

for this parameter.

PR012: Mixing flap position.

0 % = Max. cold position (15 ˚C)

100 % = Max. hot position (27 ˚C)

If there is a fault, refer to the fault finding procedure

for this parameter.

ET141: Passenger compartment blower.

OFF(according to test

conditions: see Notes).

If there is a fault, refer to the fault finding procedure

for this status.Note: This status is only

operative for climate control systems.

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Sub-function: heater (continued 1)

Computer (signal generator)

Parameter or status check or action

Display and Notes Fault finding

UCH

PR001: Battery voltage. 10.5 < X < 14.4 volts. If there is a fault, refer to the fault finding procedure for this parameter. If the fault is still present, carry

out a fault finding test on the charging circuit.

PR002: External temperature.

X = external temperature ± 5 ˚C

(invalid value: 215 ˚C).

If there is a fault, refer to the fault finding procedure

for this parameter.

ET025: Retractable roof. CLOSED or NOT CLOSEDABSENT if the vehicle

does not have one.

If there is a fault, refer to the fault finding procedure

for this status.

ET091: Engine running. NONote: This status is

displayed by the UCH but is generated by the injection computer.

If there is a fault, refer to the fault finding procedure

for this status.(Injection Technical Note).

ET015: Passenger compartment blower.

INACTIVE(according to test

conditions: see Notes).

If there is a fault, refer to the fault finding procedure

for this status.Note: This status is only operative for manual air

conditioning (and heater versions without air

conditioning).

ET026: Heated rear screen switch.

INACTIVE(Inhibited with engine

stopped).

If there is a fault, refer to the fault finding procedure

for this status.

ET031: Fast idle request for RCH.

INACTIVE(Inhibited with engine

stopped).

If there is a fault, refer to the fault finding procedure

for this status.

ET017: Number RCH required.

0, 1, 2 or 3 for Mégane saloons and coupes (1000 watt RCH).

0, 1, 2, 3, 4 or 5 for Mégane Scénics (1800 watt RCH).

(according to heat requirement).

If there is a fault, refer to the fault finding procedure

for this status.

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Sub-function: heater (continued 2)

Computer (signal generator)

Parameter or status check or action

Display and Notes Fault finding

UCH(continued)

ET018: Number RCH authorised by alternator.

0(Inhibited with engine

stopped).

If there is a fault, refer to the fault finding procedure

for this status.

ET019: Number RCH authorised by injection.

0(Inhibited with engine

stopped).

If there is a fault, refer to the fault finding procedure

for this status.

ET020: Number RCH activated.

0(Inhibited with engine

stopped).

If there is a fault, refer to the fault finding procedure

for this status.

ET021: RCH relay control 1.

INACTIVE(Inhibited with engine

stopped).

If there is a fault, refer to the fault finding procedure

for this status.

ET022: RCH relay control 2.

INACTIVE(Inhibited with engine

stopped).

If there is a fault, refer to the fault finding procedure

for this status.

ET023: RCH relay control 3 (Mégane Scénic and Scénic 4x4 only).

INACTIVE(Inhibited with engine

stopped).

If there is a fault, refer to the fault finding procedure

for this status.Note: This status is

inoperative for Mégane saloons and

Mégane coupes.

AC016: RCH relay 1. Commands for testing the operation of the RCH

(passenger compartment air resistors). The number

of RCH stages switched on depends on the number of

relays activated.Note: RCH relay 3 is only fitted to Mégane Scénics.

If there is a fault, refer to the fault finding procedure

for these controls.Note: For information on the

correlation between the relays actuated and the

number of RCH engaged, refer to the General

operation section of the UCH Technical Note.

AC017: RCH relay 2.

AC018: RCH relay 3 (Mégane Scénic only).

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Sub-function: heater (continued 3)

Computer (signal generator)

Parameter or status check or action

Display and Notes Fault finding

Injection

ET024: Set number of RCH.

NONote: Depending on the

requirements of the injection system: power

requirement, torque reduction, etc., the injection computer sets the number of the RCH stage switched

on (no more, no less).

If there is a fault, refer to the fault finding procedure

for this status.

PR064: Coolant temperature.

X = engine coolant temperature.

If there is a fault, refer to the fault finding procedure

for this parameter.

Protection and Switching Unit

PR002: Alternator charging signal.

99 %, engine stopped. If there is a fault, refer to the fault finding procedure

for this parameter.

AC011: Heated rear screen.

Command for testing the operation of the rear screen

heating.

If there is a fault, consult the fault finding procedure

for this command.Note: The UPC cannot test

the rear screen heating control circuit; this

command is the only way to test its operation.

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Sub-function: user selection

NOTES

Only carry out this conformity check after a full check with the diagnostic tool (fault reading and configuration checks).Test conditions: ignition on (12 volts APC), engine stopped, AIR CONDITIONING SWITCHED OFF (passenger compartment blower switched off and air conditioning compressor not engaged).Note: The fault finding procedure for the statuses, parameters and commands listed in this check are explained in the technical notes relating to the computer which generates the signal (see the Introduction section).

Computer (signal generator)

Parameter or status check or action

Display and Notes Fault finding

Climate control

ET086: Heated rear screen: manual mode.

ACTIVE: De-icing button at the bottom of the

control panel pressed.INACTIVE otherwise.

If there is a fault, refer to the fault finding procedure

for this status.

ET085: Heated rear screen: auto mode.

ACTIVE: De-icing button at the top of the

control panel pressed ("See clear" function).INACTIVE otherwise.

If there is a fault, refer to the fault finding procedure

for this status.

ET143: Air conditioning request 1.

ACTIVE for air conditioning request (AC button pressed

or AUTO button pressed with maximum cold

request).INACTIVE otherwise.

Note: This status is only valid for climate control

systems.

If there is a fault, refer to the fault finding procedure

for this status.Note: This status

represents the request from the air conditioning

computer to the UCH to engage the compressor (refer to the flowchart in

the General operation section).

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Sub-function: user selection (continued)

Computer (signal generator)

Parameter or status check or action

Display and Notes Fault finding

UCH

ET029: Air conditioning button.

PRESSED if the AC button on the air conditioning

control panel is pressed.RELEASED otherwise.

If there is a fault, refer to the fault finding procedure

for this status.Note: This status is only operative for manual air conditioning systems.

ET028: Heated rear screen button.

PRESSED if the heated rear screen key on the air conditioning control

panel is pressed.RELEASED otherwise.

If there is a fault, refer to the fault finding procedure

for this status.Note: This status is only operative for manual air

conditioning (and heater versions without air

conditioning).

ET015: Passenger compartment blower.

INACTIVE(according to test

conditions: see Notes).

If there is a fault, refer to the fault finding procedure

for this status.Note: This status is only operative for manual air

conditioning (and heater versions without air

conditioning).

AC015: Air conditioning button light.

Command enabling the air conditioning button light

to be illuminated to check its operation.

If there is a fault, consult the fault finding procedure

for this command.Note: This command is only

operative for manual air conditioning systems.

AC019: Heated rear screen indicator light.

Command enabling the heated rear screen button light to be illuminated to

check its operation.

If there is a fault, consult the fault finding procedure

for this command.Note: This command is only

operative for manual air conditioning systems (and heater versions

without air conditioning).

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Sub-function: passenger compartment ventilation

NOTES

Only carry out this conformity check after a full check with the diagnostic tool (fault reading and configuration checks).Test conditions: ignition on (12 volts APC), engine stopped, AIR CONDITIONING SWITCHED OFF (passenger compartment blower switched off and air conditioning compressor not engaged).Note:Read the parameters when the vehicle is cold (in the morning) to check the conformity of the temperature parameters (without thermometer). The temperatures should be approximately equal (internal, external and engine coolant). Fault finding procedures for the statuses, parameters and commands listed in this check are explained in the technical notes relating to the computer which generates the signal (see the Introduction section).

Computer (signal generator)

Parameter or status check or action

Display and Notes Fault finding

Climate control

PR019: Passenger compartment blower PWM setting.

Speed 0 = 0 %.Speed 8 = 100 %.

Note: The PWM signal is a modulated control voltage used to control the power module for the passenger

compartment blower.

If there is a fault or for more information (to find the

intermediate speed percentages), refer to the fault finding procedure

for this parameter.

PR012: Mixing flap position.

0 % = Max. cold position (15 ˚C)

100 % = Max. hot position (27 ˚C)

If there is a fault, refer to the fault finding procedure

for this parameter.

ET062: Recirculation flap position.

OPEN if the flap is in the external air position.

CLOSED if the flap is in the recirculation position.

If there is a fault, refer to the fault finding procedure

for this status.

PR011: Distribution flap position.

from 0 % to 100 %.Note:

0 % = Full air vents position100 % = De-icing position.

If there is a fault or for more information (various flap opening values according

to the user selection), refer to the fault finding procedure for this

parameter.

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Sub-function: passenger compartment ventilation (continued)

Computer (signal generator)

Parameter or status check or action

Display and Notes Fault finding

Climate control (continued)

PR001: Internal temperature.

X = internal temperature ± 5 ˚C

(invalid value: 87.5).

If there is a fault, refer to the fault finding procedure

for this parameter.

PR002: External temperature.

X = external temperature ± 5 ˚C

(invalid value: 215 ˚C).Note: This status is

displayed via the climate control computer but is generated by the UCH.

If there is a fault, refer to the fault finding procedure

for this parameter (UCH technical note).

PR006: Solar radiation. 0 watts (no sunlight)to 400 watts (maximum

sunlight).

If there is a fault, refer to the fault finding procedure

for this parameter.

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Sub-function: cold loop

NOTES

Only carry out this conformity check after a full check with the diagnostic tool (fault reading and configuration checks).Test conditions: engine at idle speed, AIR CONDITIONING OPERATING (air conditioning compressor engaged).Note:Read the parameters when the vehicle is cold (in the morning) to check the conformity of the temperature parameters (without thermometer). The temperatures should be approximately equal (internal, external and engine coolant).Fault finding procedures for the statuses, parameters and commands listed in this check are explained in the technical notes relating to the computer which generates the signal (see the Introduction section).

Computer (signal generator)

Parameter or status check or action

Display and Notes Fault finding

Climate control

ET143: Air conditioning request 1.

ACTIVENote: This status is only valid for climate control

systems.

If there is a fault, refer to the fault finding procedure

for this status.Note: This status

represents the request from the air conditioning

computer to the UCH to engage the compressor (refer to the flowchart in

the General operation section).

PR001: Internal temperature.

X = internal temperature ± 5 ˚C

(invalid value: 87.5 ˚C)

If there is a fault, refer to the fault finding procedure

for this parameter.

ET141: Passenger compartment blower.

RUNNING(according to test

conditions: see Notes).

If there is a fault, refer to the fault finding procedure

for this status.Note: This status is only

operative for climate control systems.

PR012: Mixing flap position.

0 % = Max. cold position (15 ˚C)

100 % = Max. hot position (27 ˚C)

If there is a fault, refer to the fault finding procedure

for this parameter.

PR006: Solar radiation. 0 watts (no sunlight) to 400 watts (maximum

sunlight).

If there is a fault, refer to the fault finding procedure

for this parameter.

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Sub-function: cold loop (continued 1)

Computer (signal generator)

Parameter or status check or action

Display and Notes Fault finding

UCH

ET030: Air conditioning request 2.

ACTIVE If there is a fault, refer to the fault finding procedure

for this status.Note: This status

represents the request from the UCH to the injection computer to engage the compressor (refer to the flowchart in the General

operation section).

PR002: External temperature

X = external temperature ± 5 ˚C

(invalid value: 215 ˚C)

If there is a fault, refer to the fault finding procedure

for this parameter.

ET015: Passenger compartment blower.

ACTIVE(according to test

conditions: see Notes).

If there is a fault, refer to the fault finding procedure

for this status.Note: This status is only operative for manual air

conditioning (and heater versions without air

conditioning).

ET091: Engine running. YESNote: This status is

displayed by the UCH but is generated by the injection

computer.

If there is a fault, refer to the fault finding procedure

for this status.(Injection Technical Note).

Injection

ET079: Air conditioning present.

YES(automatic injection

computer configuration).

If the status displays NO, refer to the fault finding

procedure for this status.

PR064: Coolant temperature.

X = engine coolant temperature.

If there is a fault, refer to the fault finding procedure

for this parameter.

ET004: Air conditioning authorisation.

YES If the status displays NO, refer to the fault finding

procedure for this status.

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Sub-function: cold loop (continued 2)

Computer (signal generator)

Parameter or status check or action

Display and Notes Fault finding

Injection(continued 1)

ET088: Compressor activation request.

ACTIVE If the status displays INACTIVE, refer to the fault finding procedure for this

status.Note: This status

represents the request from the injection computer to

the Protection and Switching Unit to engage

the compressor (refer to the flowchart in the General

operation section).

PR089: Vehicle speed. 0 mph or km/h If there is a fault, refer to the fault finding procedure

for this parameter.

PR055: Engine speed. 800 rpm. If there is a fault, refer to the fault finding procedure

for this parameter.

ET023: Fast idle request (except EDC 16 injection).

PRESENT If there is a fault: refer to the fault finding procedure

for this status.Note: This status is not displayed by the EDC16 injection (F9Q engine).

PR053: Engine speed required by air conditioning (except S3000 and DDCR injections).

800 rpm. If there is a fault, refer to the fault finding procedure

for this parameter.Note: This parameter is only displayed by the

EDC16 injection (F9Q engine).

PR037: Refrigerant pressure.

1 bar < X < 27 bar If there is a fault, refer to the fault finding procedure

for this parameter.

PR125: Power absorbed by air conditioning compressor.

300 W < X < 5000 W(ambient temperature =

23 ˚C)

If there is a fault, refer to the fault finding procedure

for this parameter.

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Sub-function: cold loop (continued 3)

Computer (signal generator)

Parameter or status check or action

Display and Notes Fault finding

Injection(continued 2)

ET022: Low-speed fan assembly request (except 3000 injection).

ACTIVE if the refrigerant fluid pressure is less than 23 bar

INACTIVE otherwiseNote: This status is not displayed by the S3000

injection (K4J, K4M, F4R and F4RT engines).

If there is a fault, refer to the fault finding procedure

for this status.– For more information

(Control of Fan 1 or Fan 2 according to vehicle speed and refrigerant fluid pressure), refer to the HELP section (62B).

ET021: High-speed fan assembly request (except S3000 injection).

ACTIVE if the refrigerant fluid pressure is

more than 23 barINACTIVE otherwise

Note: This status is not displayed by the S3000

injection (K4J, K4M, F4R and F4RT engines).

If there is a fault, refer to the fault finding procedure

for this status.– For more information

(Control of Fan 1 or Fan 2 according to vehicle speed and refrigerant fluid pressure), refer to the HELP section (62B).

ET014: Checking fan assembly 1(except DDCR injection).

RUNNING if the refrigerant fluid pressure is less than 23 bar OFF otherwise

If there is a fault, refer to the fault finding procedure

for this status.Note: This status is not displayed by the DDCR injection (K9K engine).

ET015: Fan assembly 2 check (except DDCR injection).

RUNNING if the refrigerant fluid pressure is

more than 23 barOFF otherwise

If there is a fault, refer to the fault finding procedure

for this status.Note: This status is not displayed by the DDCR injection (K9K engine).

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Sub-function: cold loop (continued 4)

Computer (signal generator)

Parameter or status check or action

Display and Notes Fault finding

Protection and Switching Unit

ET007: High-speed fan assembly control.

INACTIVE(On Mégane saloons and

coupes this status is always ACTIVE: ignore it).

If there is a fault, refer to the fault finding procedure

for this status.Note: This status is only

operative on Mégane Scénics (2 engine cooling

fans and Fan 2 relay outside the UPC).

AC008: Compressor control.

Command for testing the operation of the air

conditioning compressor clutch.

If there is a fault, consult the fault finding procedure

for this command.Note: The UPC cannot test

the compressor control circuit; this command is the

only way to test its operation.

AC009: Low-speed fan assembly.

Command for testing the low speed operation of the

engine cooling fan assembly (Fan 1).

If there is a fault, consult the fault finding procedure

for this command.Note: The UPC cannot test the control circuit for fan 1; this command is the only way to test its operation.

AC010: High-speed fan assembly.

Command for testing the high speed operation of the engine cooling fan

assembly (Fan 2).

If there is a fault, consult the fault finding procedure

for this command.Note: On Mégane saloons

and coupes the UPC cannot test the control circuit for Fan 2; this

command is the only way to test its operation.

On Mégane Scénics, the Fan 2 control relay is

outside the UPC and its control line is tested by

(DF002 High-speed fan assembly relay

control circuit).

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Sub-function: heater

NOTES

Only carry out this conformity check after a full check with the diagnostic tool (fault reading and configuration checks).Test conditions: engine at idle speed, AIR CONDITIONING OPERATING (air conditioning compressor engaged).Note:Fault finding procedures for the statuses, parameters and commands listed in this check are explained in the technical notes relating to the computer which generates the signal (see the Introduction section).

Computer (signal generator)

Parameter or status check or action

Display and Notes Fault finding

Climate control

ET086: Heated rear screen: manual mode.

ACTIVE: De-icing button at the bottom of the

control panel pressed.INACTIVE otherwise.

If there is a fault, refer to the fault finding procedure

for this status.

ET085: Heated rear screen: auto mode.

ACTIVE: De-icing button at the top of the

control panel pressed ("See clear" function).INACTIVE otherwise.

If there is a fault, refer to the fault finding procedure

for this status.

PR121: Blown air temperature setting.

0 < X < 80 ˚C. If there is a fault, refer to the fault finding procedure

for this parameter.

PR001: Internal temperature.

X = internal temperature ± 5 ˚C

(invalid value: 87.5).

If there is a fault, refer to the fault finding procedure

for this parameter.

PR012: Mixing flap position.

0 % = Max. cold position (15 ˚C)

100 % = Max. hot position (27 ˚C)

If there is a fault, refer to the fault finding procedure

for this parameter.

ET141: Passenger compartment blower.

RUNNING.(according to test

conditions: see Notes).

If there is a fault, refer to the fault finding procedure

for this status.Note: This status is only

operative for climate control systems.

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Sub-function: heater (continued 1)

Computer (signal generator)

Parameter or status check or action

Display and Notes Fault finding

UCH

PR001: Battery voltage. 12.5 < X < 14.4 volts. If there is a fault, refer to the fault finding procedure for this parameter. If the fault is still present, carry out fault finding on the

charge circuit.

PR002: External temperature.

X = external temperature ± 5 ˚C

(invalid value: 215 ˚C).

If there is a fault, refer to the fault finding procedure

for this parameter.

ET025: Retractable roof. CLOSED or NOT CLOSEDABSENT if the vehicle does

not have one.

If there is a fault, refer to the fault finding procedure

for this status.

ET091: Engine running. YESNote: This status is

displayed by the UCH but is generated by the injection

computer.

If there is a fault, refer to the fault finding procedure

for this status.(Injection Technical Note).

ET015: Passenger compartment blower.

ACTIVE(according to test

conditions: see Notes).

If there is a fault, refer to the fault finding procedure

for this status.Note: This status is only operative for manual air

conditioning (and heater versions without air

conditioning).

ET026: Heated rear screen switch.

ACTIVE if the heated rear screen is operating.

INACTIVE otherwise.

If there is a fault, refer to the fault finding procedure

for this status.

ET031: Fast idle request for RCH.

ACTIVE if the RCH are operating.

INACTIVE otherwise.

If there is a fault, refer to the fault finding procedure

for this status.

ET017: Number RCH required.

0, 1, 2 or 3 for Mégane saloons and coupes (1000 watt RCH).

0, 1, 2, 3, 4 or 5 for Mégane Scénics (1800 watt RCH).

(according to heat requirement).

If there is a fault, refer to the fault finding procedure

for this status.

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Sub-function: heater (continued 2)

Computer (signal generator)

Parameter or status check or action

Display and Notes Fault finding

UCH (continued 1)

ET018: Number RCH authorised by alternator.

0, 1, 2 or 3 for Mégane saloons and coupes (1000 watt RCH).

0, 1, 2, 3, 4 or 5 for Mégane Scénics (1800 watt RCH).

(depending on the electricity available).

If there is a fault, refer to the fault finding procedure

for this status.

ET019: Number RCH authorised by injection.

0, 1, 2 or 3 for Mégane saloons and coupes (1000 watt RCH).

0, 1, 2, 3, 4 or 5 for Mégane Scénics (1800 watt RCH).

(according to the injection's requirements: power requirement, torque

reduction, etc.).

If there is a fault, refer to the fault finding procedure

for this status.

ET020: Number RCH activated.

0, 1, 2 or 3 for Mégane saloons and coupes (1000 watt RCH).

0, 1, 2, 3, 4 or 5 for Mégane Scénics (1800 watt RCH).

(depending on statuses ET017, ET018 and ET019).

If there is a fault, refer to the fault finding procedure

for this status.

ET021: RCH relay control 1.

ACTIVE or INACTIVE(depending on status

ET020).

If there is a fault, refer to the fault finding procedure

for this status.

ET022: RCH relay control 2.

ACTIVE or INACTIVE(depending on status

ET020).

If there is a fault, refer to the fault finding procedure

for this status.

ET023: RCH relay control 3 (Mégane Scénic and Scénic 4x4 only).

ACTIVE or INACTIVE(depending on status

ET020).

If there is a fault, refer to the fault finding procedure

for this status.Note: this status is

inoperative for Mégane saloons and

Méganes coupes.

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Sub-function: heater (continued 3)

Computer (signal generator)

Parameter or status check or action

Display and Notes Fault finding

UCH (continued 2)

AC016: RCH relay 1. Commands for testing the operation of the RCH

(passenger compartment air heating resistors). The number of RCH stages switched on

depends on the number of relays activated.

Note: RCH relay 3 is only fitted to Mégane Scénics.

If there is a fault, refer to the fault finding procedure

for these controls.Note: For information on the

correlation between the relays actuated and the

number of RCH engaged, refer to the General

operation section of the UCH Technical Note.

AC017: RCH relay 2.

AC018: RCH relay 3.(Mégane Scénics only)

Injection

ET024: Set number of RCH.

YES or NO Note: Depending on the

requirements of the injection system: power

requirement, torque reduction, etc., the injection computer sets the number of the RCH stage switched

on (no more, no less).

If there is a fault, refer to the fault finding procedure

for this status.

PR064: Coolant temperature.

X = engine coolant temperature.

If there is a fault, refer to the fault finding procedure

for this parameter.

Protection and Switching Unit

PR002: Alternator charging signal.

0 < X < 100 %– 0 % = zero electricity

consumption.– 100 % = maximum

electricity consumption.

If there is a fault, refer to the fault finding procedure

for this parameter.

AC011: Heated rear screen.

Command for testing the operation of the rear screen

de-icer.

If there is a fault, consult the fault finding procedure

for this command.Note: The UPC cannot test

the rear screen de-icer control circuit; this

command is the only way to test its operation.

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Sub-function: user selection

NOTES

Only carry out this conformity check after a full check with the diagnostic tool (fault reading and configuration checks).Test conditions: engine at idle speed, AIR CONDITIONING OPERATING (air conditioning compressor engaged).Note:The fault finding procedure for the statuses, parameters and commands listed in this check are explained in the technical notes relating to the computer which generates the signal (see the Introduction section).

Computer (signal generator)

Parameter or status check or action

Display and Notes Fault finding

Climate control

ET086: Heated rear screen: manual mode.

ACTIVE: De-icing button at the bottom of the control

panel pressed.INACTIVE otherwise.

If there is a fault, refer to the fault finding procedure

for this status.

ET085: Heated rear screen: auto mode.

ACTIVE: De-icing button at the top of the

control panel pressed ("See clear" function).INACTIVE otherwise.

If there is a fault, refer to the fault finding procedure

for this status.

ET143: Air conditioning request 1.

ACTIVENote: This status is only valid for climate control

systems.

If there is a fault, refer to the fault finding procedure

for this status.Note: This status

represents the request from the air conditioning

computer to the UCH to engage the compressor (refer to the flowchart in

the General operation section).

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Sub-function: user selection (continued)

Computer (signal generator)

Parameter or status check or action

Display and Notes Fault finding

UCH

ET029: Air conditioning button.

PRESSED(AC button on the manual

air conditioning control panel pressed).

If there is a fault, refer to the fault finding procedure

for this status.Note: This status is only operative for manual air conditioning systems.

ET028: Heated rear screen button.

PRESSED if the heated rear screen key on the air conditioning control

panel is pressed.RELEASED otherwise.

If there is a fault, refer to the fault finding procedure

for this status.Note: This status is only operative for manual air

conditioning (and heater versions without air

conditioning).

ET015: Passenger compartment blower.

ACTIVE(according to test

conditions: see Notes).

If there is a fault, refer to the fault finding procedure

for this status.Note: This status is only operative for manual air

conditioning (and heater versions without air

conditioning).

AC015: Air conditioning button indicator light.

Command enabling the air conditioning button

indicator light to be illuminated to check

its operation.

If there is a fault, consult the fault finding procedure

for this command.Note: This command is only

operative for manual air conditioning systems.

AC019: Heated rear screen indicator light.

Command enabling the heated rear screen button light to be illuminated to

check its operation.

If there is a fault, consult the fault finding procedure

for this command.Note: This command is only

operative for manual air conditioning systems (and heater versions

without air conditioning).

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Sub-function: passenger compartment ventilation

NOTES

Only carry out this conformity check after a full check with the diagnostic tool (fault reading and configuration checks).Test conditions: engine at idle speed, AIR CONDITIONING OPERATING (air conditioning compressor engaged).Note:Read the parameters when the vehicle is cold (in the morning) to check the conformity of the temperature parameters (without thermometer). The temperatures should be approximately equal (internal, external and engine coolant). Fault finding procedures for the statuses, parameters and commands listed in this check are explained in the technical notes relating to the computer which generates the signal (see the Introduction section).

Computer (signal generator)

Parameter or status check or action

Display and Notes Fault finding

Climate control

PR019: PWM settingPassenger compartment blower.

from 18 % to 100 %. (18 % corresponds to

speed 1)Note: The PWM signal is a modulated control voltage used to control the power module for the passenger

compartment blower.

If there is a fault or for more information (to find the

intermediate speed percentages), refer to the fault finding procedure

for this parameter.

PR012: Mixing flap position.

0 % = Max. cold position (15 ˚C)

100 % = Max. hot position (27 ˚C)

If there is a fault, refer to the fault finding procedure

for this parameter.

ET062: Recirculation flap position.

OPEN if the flap is in the external air position.

CLOSED if the flap is in the recirculation position.

If there is a fault, refer to the fault finding procedure

for this status.

PR011: Distribution flap position.

from 0 % to 100 %.Note:

0 % = Full air vents position100 % = De-icing position

If there is a fault or for more information (various flap opening values according

to the user selection), refer to the fault finding procedure for this

parameter.

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Sub-function: passenger compartment ventilation (continued)

Computer (signal generator)

Parameter or status check or action

Display and Notes Fault finding

Climate control (continued)

PR001: Internal temperature.

X = internal temperature ± 5 ˚C

(invalid value: 87.5).

If there is a fault, refer to the fault finding procedure

for this parameter.

PR002: External temperature.

X = external temperature ± 5 ˚C

(invalid value: 215 ˚C).Note: This status is

displayed via the climate control computer but is generated by the UCH.

If there is a fault, refer to the fault finding procedure

for this parameter (UCH technical note).

PR006: Solar radiation. 0 watts (no sunlight)to 400 watts (maximum

sunlight).

If there is a fault, refer to the fault finding procedure

for this parameter.

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AIR CONDITIONINGFault finding – Customer complaints

NOTESSpecial notes:This section gives the complete list of possible customer complaints (the fault finding charts are to be found in sections 62A, 62B and 62C: see below).

COMMUNICATION FAULT (only for regulated versions) Section 62B

NO DIALOGUE WITH THE COMPUTER ALP 1

AIR DISTRIBUTION PROBLEM Sections 62B and 62C

AIR DISTRIBUTION PROBLEM ALP 2

AIR FLOW FAULT ALP 3

INEFFICIENT WINDSCREEN DEMISTING ALP 4

NO PASSENGER COMPARTMENT VENTILATION ALP 5

AIR CONDITIONING FAULT Section 62A

NO HEATING OR INADEQUATE HEATING ALP 6

EXCESSIVE HEATING ALP 7

NO COLD AIR ALP 8

TOO MUCH COLD AIR ALP 9

INEFFICIENT REAR SCREEN DE-ICING OR DEMISTING ALP 10

PASSENGER COMPARTMENT ODOURS Sections 62B and 62C

UNPLEASANT ODOURS IN PASSENGER COMPARTMENT ALP 11

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WATER IN PASSENGER COMPARTMENT Sections 62B and 62C

WATER IS PRESENT IN PASSENGER COMPARTMENT ALP 12

CONTROL PANEL FAULT Sections 62B and 62C

NO CONTROL PANEL LIGHTING ALP 13

COMPRESSOR NOISES Section 62A, 62B and 62C

AIR CONDITIONING NOISES DURING OPERATION ALP 14

PASSENGER COMPARTMENT VENTILATION NOISES ALP 15

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AIR CONDITIONINGFault finding – Fault Finding Chart

ALP 6 No heating or inadequate heating

NOTESOnly refer to this customer complaint after a full check with the diagnostic tool (fault reading and configuration checks).

Is the air flow correct?

YES

Is the air distribution correct?

YES

With the engine warm, select the MAX heat position.

Is the blown air hot?

NO

Using the diagnostic tool statuses and parameters screen (cold loop sub-function), check that the temperature signals are correct (no sensor drift resulting in incorrect measurement).For manual air conditioning systems:– External air temperature and engine coolant

temperature.For climate control systems:– External air temperature, engine coolant

temperature and internal air temperature.Depending on the vehicle equipment, also check that the internal air temperature sensor mini-turbine is operating correctly (this can distort the measurement if it is faulty).

Are the temperature signals consistent?

YES

NO

NO

YES

NO

See ALP 3, air flow fault.

See ALP 2, air distribution fault.

If necessary, explain how the system works to the customer again.

Carry out a conformity check on the sensors (refer to the relevant section).Replace any faulty components.

AFTER REPAIR Perform a complete check using the diagnostic tool.

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ALP 6

CONTINUED

With the engine warm and passenger compartment ventilation operating, vary the position of the mixing flap from the very cold position to the very hot position and check subjectively that there is a difference in temperature.

Can you feel the difference in temperature?

YES

NO

For climate control systems:Carry out a conformity check on the mixing motor (PR012 Mixing motor). If the conformity check does not reveal any faults, look for a mechanical fault with the mixing flap (condition of the motor's toothed sector, flap jammed inside the unit, etc.).For manual air conditioning and heater versions:Check the condition and routing of the mixing flap control cable. Eliminate any constraints on it: kinks, cable restricted by plastic clips, etc. Replace it if necessary. Unclip the cable from the side of the unit and check the stiffness of movement of each component: control button and flap control on the air distribution unit.Check that there is no mechanical fault with the mixing flap (flap jammed inside the unit, etc.).Carry out any necessary repairs.

Is the fault still present?

YES

Is the lower heater matrix pipe (coolant inlet) hot? Note: Pipe located on the left-hand side of the heater-air conditioning unit, near the engine bulkhead.

YES

Check that the heater matrix is not blocked: The top heater matrix pipe should be hot. Note: Pipe located on the left-hand side of the heater/climate control unit, at the engine compartment bulkhead. Clean the heater matrix or replace it if necessary.

Is the fault still present?

YES NO

If the vehicle is fitted with passenger compartment heating resistors (RCH), check that these are operating correctly by referring to the fault finding procedure in the UCH Technical Note.

NO

Carry out a check on the coolant circuit and ensure that the thermostatic valve opens at the correct temperature. Replace the valve if necessary.

NO

End of fault finding procedure.

AFTER REPAIR Perform a complete check using the diagnostic tool.

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ALP 7 Too much hot air

NOTESOnly refer to this customer complaint after a full check with the diagnostic tool (fault reading and configuration checks).

Is the air flow correct?

YES

Is the air distribution correct?

YES

Using the diagnostic tool statuses and parameters screen (cold loop sub-function), check that the temperature signals are correct (no sensor drift resulting in incorrect measurement). For manual air conditioning: External air temperature and engine coolant temperature.For regulated climate control systems: External air temperature, engine coolant temperature and internal air temperature.Depending on the vehicle equipment, also check that the internal air temperature sensor mini-turbine is operating correctly (this can distort the measurement if it is faulty).

Are the temperature signals consistent?

YES

With the engine warm and passenger compartment ventilation operating, vary the position of the mixing flap from the maximum hot position to the maximum cold position and check subjectively that there is a difference in temperature.

Can you feel the difference in temperature?

YES

Carry out a conformity check on the sensors (refer to the relevant section). Replace any faulty components.

For climate control systems:Carry out a conformity check on the mixing motor (PR012 Mixing motor). If the conformity check does not reveal any faults, look for a mechanical fault with the mixing flap (condition of the motor's toothed sector, flap jammed inside the unit, etc.).For manual air conditioning systems:Check the condition and routing of the mixing flap control cable. Eliminate any constraints on it: kinks, cable restricted by plastic clips, etc. Replace it if necessary. Unclip the cable from the side of the unit and check the stiffness of movement of each component: control button and flap control on the air distribution unit.Check that there is no mechanical fault with the mixing flap (flap jammed inside the unit, etc.).Carry out any necessary repairs.

Manual air conditioning and

Climate control

NO

NO

NO

NO

See ALP 3, air flow fault.

See ALP 2, air distribution fault.

AFTER REPAIR Perform a complete check using the diagnostic tool.

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ALP 7

CONTINUED

For climate control systems:Using the diagnostic tool statuses and parameters screen (passenger compartment ventilation sub-function), check that the recirculation flap is in the external air position: status ET062 Recirculation flap position should display OPEN. If it is closed when the user does not want recirculation, use the fault finding procedure for fault: DF021 Recirculation motor circuit.For manual air conditioning systems:check that the recirculation flap is in the external air position. If this is not operating correctly (impossible to change the flap to the exterior air position), check the condition and routing of the recirculation flap control cable. Eliminate any constraints on it: kinks, cable restricted by plastic clips, etc. Replace it if necessary. Check that there is no mechanical fault with the recirculation flap (flap jammed). Carry out any necessary repairs.

Is the fault still present?

YES NO

Is the lower heater matrix pipe (coolant inlet) hot?

Note: Pipe located on the left-hand side of the heater/climate control unit, at the engine compartment bulkhead.

NO

Carry out a check on the coolant circuit and ensure that thermostatic valve opens at the correct temperature.Replace the valve if necessary.

YES

If the vehicle is fitted with passenger compartment heating resistors, check that these are operating correctly (not switching on unnecessarily) by referring to the fault finding procedure contained in the UCH technical note. End of fault finding procedure.

AFTER REPAIR Perform a complete check using the diagnostic tool.

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ALP 8 No cold air

NOTESOnly carry out this conformity check after a full check with the diagnostic tool (fault reading and configuration checks).

Using the diagnostic tool statuses and parameters screen (cold loop sub-function), check that the temperature signals are consistent (no sensor drift resulting in incorrect measurement).For manual air conditioning: External air temperature and engine coolant temperature.For regulated climate control systems: External air temperature, engine coolant temperature and internal air temperature. Depending on the vehicle equipment, also check that the internal air temperature sensor mini-turbine is operating correctly (this can distort the measurement if it is faulty).

Are the temperature signals consistent?

YES

Start the engine and switch on the air conditioning by pressing the AC button (with a request for maximum cold temperature and the passenger compartment fan running).View the following statuses on the user selection sub-function screen:– For climate control systems:Status ET143 AIR CONDITIONING REQUEST 1 should display ACTIVE and the symbol AC should be displayed on the air conditioning control panel screen.– For manual air conditioning systems:Status ET029 AIR CONDITIONING BUTTON should display PRESSED.Note: these statuses show the request from the air conditioning control panel to the UCH to start the air conditioning.

Are the correct statuses displayed?

YES

NO

Carry out a conformity check on the sensors.Replace any faulty components.

NOContact your Techline.

AFTER REPAIR Perform a complete check using the diagnostic tool.

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ALP 8

CONTINUED 1

With the engine running at idle speed, use the diagnostic tool to check that the UCH does in fact send the start air conditioning request to the injection computer. Status ET030 AIR CONDITIONING REQUEST 2 should display ACTIVE.

Is the correct status displayed? NO

YES YES

View the following states on the diagnostic tool (cold loop subsystem screen):– ET004 AIR CONDITIONING

AUTHORISATION: this status should be displayed as YES,

– ET088 COMPRESSOR ENGAGEMENT REQUEST: this status should be displayed as ACTIVE.

Are the correct statuses displayed? YES

NO

Check that the injection computer is correctly configured. Status ET079 AIR CONDITIONING PRESENT should display YES (cold loop sub-function screen).Note: Status ET079 is present in all injection systems.S3000 injection (K4J, K4M, F4R and F4RT engines) has 2 additional configuration readings:– LC009 "AIR CONDITIONING" should display "CONNECTED",– LC016 "AIR CONDITIONING PRESSURE SIGNAL MANAGEMENT" should display "WITH".

Is the injection computer correctly configured?

YES NO

Reconfigure the injection computer (automatic configuration: see the "Introduction" section in the Injection note).

Check that the UCH is correctly configured by viewing the configuration reading LC013 TYPE OF AIR CONDITIONING.Reconfigure the UCH if necessary.

Check that the UCH is receiving the engine operating status and passenger compartment fan signals correctly (for manual air conditioning).On the heating sub-function screen, status ET091 ENGINE RUNNING should display YES and status ET015 PASSENGER COMPARTMENT FAN should display ACTIVE.

Are the correct statuses displayed?

NO

Carry out a fault finding procedure on the multiplex network, the injection (interpretation of status ET091), and the UCH (interpretation of status ET015).

AFTER REPAIR Perform a complete check using the diagnostic tool.

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ALP 8

CONTINUED 2

Carry out fault finding on the injection system to ensure that no fault is present (if faults are displayed by the injection computer, engagement of the air conditioning may be inhibited).If there are present or stored faults: carry out the necessary repairs (see the injection Technical Note).

Check that the refrigerant fluid pressure is correct (neither too low nor too high) using parameter PR037 REFRIGERANT FLUID PRESSURE: see the conformity check in this note (cold loop sub-function).

Check that the engine cooling fan assembly is at speed 1 by viewing the following statuses on the cold loop sub-function screen:– Status ET014 FAN ASSEMBLY 1 CHECK should

display RUNNING.– status ET022 LOW SPEED FAN ASSEMBLY REQUEST

should display ACTIVE.NOTE: These statuses are not displayed by all types of injection system (see the cold loop sub-function conformity check).

Is the engine fan running at speed 1?

YES

NO

Carry out fault finding on the injection (which calls for the fan units to be switched on) and the Switching Protection Unit (which controls the fan units).

AFTER REPAIR Perform a complete check using the diagnostic tool.

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ALP 8

CONTINUED 3

Check the condition of the air conditioning compressor belt and its tension.

Is the tension correct?

YES

With the engine stopped, use the diagnostic tool to run command AC008 COMPRESSOR CONTROL (Protection and Switching Unit command mode menu).

Does the compressor clutch jam?

YES

With the engine warm and passenger compartment ventilation operating, vary the position of the mixing flap from the maximum hot position to the maximum cold position and check subjectively that there is a difference in temperature.

Can you feel the difference in temperature?

YES

NOReplace the belt(refer to repair methods).

NO

Use the fault finding procedure for command AC008 COMPRESSOR CONTROL found in the Protection and Switching Unit Technical Note.

NO

For climate control systems:Carry out a conformity check on the mixing motor (PR012 MIXING MOTOR). If the conformity check does not reveal any faults, look for a mechanical fault with the mixing flap (condition of the motor's toothed sector, flap jammed inside the unit, etc.).For manual air conditioning systems:Check the condition and routing of the mixing flap control cable. Eliminate any stresses on it: kinks, cable restricted by plastic clips, etc.Replace it if necessary. Unclip the cable from the side of the unit and check the stiffness of movement of each component: control button and flap control on the air distribution unit.Check that there is no mechanical fault with the mixing flap (flap jammed inside the unit, etc.).Carry out any necessary repairs.

Is the fault still present?

YES NO

End of fault finding procedure.

AFTER REPAIR Perform a complete check using the diagnostic tool.

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ALP 8

CONTINUED 4

Check that the condenser is clean (presence of leaves, mud, etc.).Clean the condenser if necessary.

Check the cold loop by checking the condition of the pipes and checking that the air conditioning system is not leaking refrigerant (carry out the check with the engine cold and then hot, using the electronic buzzer or a leak detecting product to avoid filling the air conditioning system twice in succession).Repair if necessary.

With the air conditioning operating (maximum cold requested), check that the refrigerant pipe between the sized port and the evaporator is very cold to the touch (lower evaporator inlet pipe at the engine compartment bulkhead).

Is the refrigerant pipe cold?

YES

Top up the refrigerant, referring to the Repair Manual (550 g ± 25 g).

Is the fault still present?

YES NO

Replace the air conditioning compressor. End of fault finding procedure.

NOCheck the presence of the calibrated jet.

YES Is the sized port present?

NO

Replace the pipe (between the condenser outlet and the evaporator inlet).

Replace the calibrated jet.

AFTER REPAIR Perform a complete check using the diagnostic tool.

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ALP 9 Too much cold air

NOTESOnly refer to this customer complaint after a full check with the diagnostic tool (fault reading and configuration checks).

With the engine running at idle speed and air conditioning switched off ("AC" button not pressed and no "AUTO" mode), check that the air conditioning compressor clutch is not engaged.

Is the air conditioning compressor clutch engaged?

YES

With the engine stopped, use the diagnostic tool to run command AC008 COMPRESSOR CONTROL (Protection and Switching Unit command mode menu) to check the correct operation of the compressor clutch electrical control.During the command, track A of the compressor clutch must be supplied with + 12 volts. If the + 12 volts feed is still present after the command has terminated: refer to the interpretation of this command (check the continuity and insulation against + 12 volts of the electrical connection between the UPC and the compressor clutch).

If there are no faults on the compressor command line but the clutch remains engaged: check that the air conditioning compressor clutch is not seized (mechanical fault).Replace the air conditioning compressor if necessary.

Is the fault still present?

YES

NO

NO End of fault finding procedure.

AFTER REPAIR Perform a complete check using the diagnostic tool.

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ALP 9

CONTINUED

Using the diagnostic tool statuses and parameters screen (cold loop sub-function), check that the temperature signals are correct (no sensor drift resulting in incorrect measurement).For manual air conditioning: External air temperature and engine coolant temperature.For regulated climate control systems: External air temperature, engine coolant temperature and internal air temperature.Depending on the vehicle equipment, also check that the internal air temperature sensor mini-turbine is operating correctly (this can distort the measurement if it is faulty).

Are the temperature signals consistent?

YES

With the engine warm and passenger compartment ventilation operating, vary the position of the mixing flap from the very cold position to the very hot position and check subjectively that there is a difference in temperature.

Can you feel the difference in temperature?

YES

Check the refrigerant fluid level.

NO

NO

Carry out a conformity check on the sensors (refer to the relevant section).Replace any faulty components.

For climate control systems:Carry out a conformity check on the mixing motor (PR012 Mixing motor). If the conformity check does not reveal any faults, look for a mechanical fault with the mixing flap (condition of the motor's toothed sector, flap jammed inside the unit, etc.).For manual air conditioning systems:Check the condition and routing of the mixing flap control cable. Eliminate any constraints on it: kinks, cable restricted by plastic clips, etc. Replace it if necessary. Unclip the cable from the side of the unit and check the stiffness of movement of each component: control button and flap control on the air distribution unit. Check that there is no mechanical fault with the mixing flap (flap jammed inside the unit, etc.). Carry out any necessary repairs.

AFTER REPAIR Perform a complete check using the diagnostic tool.

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ALP 10 Inefficient rear screen de-icing or demisting

NOTES

Only refer to this customer complaint after a full check with the diagnostic tool (fault readings, especially those of the Protection and Switching Unit, and configuration checks).

Special notes:– Check that the inside of the glass is not greasy as this lowers the de-icing efficiency.

Note: The de-icing command may only be used when the engine is running to prevent a power drain.Rear screen de-icing can be activated in two ways:– Pressing the de-icing button (at the bottom of the control panel) switches on the

heated rear screen in manual mode (with timer) and heated door mirrors.– Pressing the de-icing button at the top of the control panel activates the "See clear"

function: heated rear screen in automatic mode (no timer) heated door mirrors, air conditioning and high speed windscreen ventilation all switched on.

Check that there are no water leaks into the passenger compartment which would significantly increase the humidity levels and reduce the effectiveness of demisting. Repair if necessary (see ALP 12).

Is the fault still present?

YES

Check for earth on the right-hand side terminal of the heated rear screen.Repair if necessary.

Use the diagnostic tool to run command AC011 Heated rear screen (Protection and Switching Unit command mode menu).

Is the 12 V feed present on the left-hand connector of the heated rear screen?

NO

NO

YES

End of fault finding procedure.

If the 12 V feed and earth both arrive correctly at the heated rear screen terminals but the screen still does not operate correctly: unclip the plastic rear screen pillars and check that the de-icing lines are not broken. The resistance of the lines should be neither zero nor infinity (average 0.5 Ω). Repair if necessary.

AFTER REPAIR Perform a complete check using the diagnostic tool.

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Climate control

ALP 10

CONTINUED 1

Use the fault finding procedure for command AC011 HEATED REAR SCREEN found in the Protection and Switching Unit Technical Note.

Is the fault still present?

YES

Using the tables below, check the control panel button(s).NOTE: With climate control systems, press the de-icing button at the top of the control panel for auto de-icing ("See clear" function), and press the de-icing button at the bottom of the control panel for manual de-icing.

CLIMATE CONTROL

ENGINE STOPPED ENGINE RUNNING

No button pressed

Auto de-icing

pressed

Manual de-icing

pressed

No button pressed

Auto de-icing

pressed

Manual de-icing

pressed

ET085 Heated rear screen: automatic mode

INACTIVE ACTIVE INACTIVE INACTIVE ACTIVE INACTIVE

ET086 Heated rear screen: manual mode

INACTIVE INACTIVE ACTIVE INACTIVE INACTIVE ACTIVE

ET026 Heated rear screen control

INACTIVE INACTIVE INACTIVE INACTIVE ACTIVE ACTIVE

MANUAL AIR CONDITIONING

(and heater version without air conditioning)

ENGINE STOPPED ENGINE RUNNING

No button pressed

De-icing pressed

No button pressed

De-icing pressed

ET026 Heated rear screen control

INACTIVE INACTIVE INACTIVE ACTIVE

ET028 Heated rear screen button

RELEASED DEPRESSED RELEASED DEPRESSED

NO End of fault finding procedure.

AFTER REPAIR Perform a complete check using the diagnostic tool.

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AIR CONDITIONINGFault finding – Fault Finding Chart 62A

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Manual air conditioning and

Climate control

ALP 10

CONTINUED 2

Do the statuses operate as shown?

NO

For climate control systems:Carry out fault finding on the multiplex system, UCH and Switching Protection Unit (requests to switch on the heated rear screen are sent via the multiplex system).For manual air conditioning systems:Refer to the interpretation of status ET028 Heated rear screen button and carry out fault finding on the UCH (the request to switch on the heated rear screen is sent via a wire connection).

End of fault finding procedure.

YES End of fault finding procedure.

AFTER REPAIR Perform a complete check using the diagnostic tool.

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Manual air conditioning and

Climate control

ALP 14 Air conditioning noises during operation

NOTESOnly deal with this customer complaint after a full check with the diagnostic tool (fault reading and configuration checks).

Check that the computers involved in the air conditioning function (Injection, Protection andSwitching Unit, UCH and Air conditioning control panel) are correctly configured.Reconfigure if necessary (see Configurations and Configuration readings).

Check that:– the compressor fitted to the vehicle corresponds correctly to the engine (see MR 364 Mechanical, 62A, Air

conditioning, Air conditioning: Parts and consumables for the repair). Replace the compressor if necessary (see MR 364, Mechanical, 62A, Air conditioning, Compressor: Removal - Refitting).– the compressor is correctly fixed (see MR 364 Mechanical, 62A, Air conditioning, Compressor:

Removal - Refitting).

Check the condition of the compressor belt and check its tension. Replace the belt if necessary (see MR 364 Mechanical, 11A, Top and front of engine, Accessories belt: Removal - Refitting).

Check that the intermediate pipes, condenser and dehydrator reservoir are correctly fitted. – Check the mountings and brackets of the components. – Check the contact between and proximity of the components. (See MR 364 Mechanical, 62A, Air conditioning, Air conditioning: List and location of components).

Check the correct operation of the cooling fan assembly or passenger compartment fan assembly and condenser:– check the electrical supply of the fan using parameters ET007 High speed fan assembly control, AC009 Low

speed fan assembly and AC010 High speed fan assembly (see Conformity check, Sub-function: Cold loop).

Check the quantity of refrigerant (see MR 364 Mechanical, 62A, Air conditioning, Air conditioning: Parts and consumables for the repair).

If the quantity of refrigerant is:– Greater than the manufacturer's information, recharge according to the manufacturer's values (see MR 364

Mechanical, 62A, Air conditioning: Draining - Filling).– Less than the manufacturer's information, check for leaks (see MR 364 Mechanical, 62A, Air conditioning,

Refrigerant circuit: Check).

If the fault is still present, replace the compressor (see MR 364, Mechanical, 62A, Air conditioning, Compressor: Removal - Refitting).

AFTER REPAIR Carry out a complete check using the diagnostic tool.

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Manual air conditioning and

Climate control

ALP 15 Passenger compartment ventilation noises

NOTESOnly deal with this customer complaint after a full check with the diagnostic tool (fault reading and configuration checks).

The aim of the following operations is to check and, if necessary, eliminate any foreign bodies (leaves, insects, other, etc.) in: – the passenger compartment air inlet,– the cabin filter housing,– the housing and on the fan assembly.

Check the passenger compartment air inlet:

Remove: – the scuttle panel grille (see MR 365 Bodywork, 56A, Exterior equipment, Scuttle panel grille:

Removal - Refitting),– the scoop under the scuttle panel grille.

Check that there are no foreign bodies (leaves, insects, other, etc.) and, if necessary, clean the passenger compartment air inlet and the cabin filter housing.

Refit:– the scoop under the scuttle panel grille,the scuttle panel grille (see MR 365 Bodywork, 56A, Exterior equipment, Scuttle panel grille: Removal - Refitting).

Check the cabin filter housing:

Remove the cabin filter (see MR 364 Mechanical, 61A, Heating system, Cabin filter: Removal – Refitting).

Check that there are no foreign bodies (leaves, insects, other, etc.) and, if necessary, clean the cabin filter housing.Refit the cabin filter (see MR 364 Mechanical, 61A, Heating system, Cabin filter: Removal – Refitting).

Check the housing and the fan assembly:

Remove the fan assembly (see MR 364 Mechanical, 61A, Heating system, Fan assembly: Removal - Refitting).

Check that there are no foreign bodies (leaves, insects, other, etc.) and, if necessary, clean the fan assembly housing.

Check that there are no foreign bodies (leaves, insects, other, etc.) and, if necessary, clean the fan assembly.Refit the fan assembly (see MR 364 Mechanical, 61A, Heating system, Fan assembly: Removal - Refitting).

AFTER REPAIR Carry out a complete check using the diagnostic tool.

CLIM X84 1.1

Edition 3