2

INTRODUCTION

The Electronic Throttle Control System (EML) regulates the operation of the throttle valve(s).The scope of EML design on BMW engines provides:

• Throttle valve positioning for optimum starting

• Precise idle speed regulation without the use of an external idle control valve/circuit

• Progressive throttle opening curves matched to the driving program (with EGS/AGS inter-face)

• Cruise control operation without additional control modules and linkages

• Automatic synchronization of the throttles (airflow balancing) for two independent banks,throughout the entire engine speed range (M70, S70, M73 engines only)

• Intake air volume control for ASC/DSC (Automatic Slip Control/Directional Stability Con-trol) systems

• Maximum road speed limiting

• Emergency “Failsafe” operation in the event of component failures

The EML control module is a link in the total scope of Engine Management Control. The EMLis interfaced with other control modules to complete the management system, which in-cludes:

• ECM(s) - Except E46 (EML integrated in MS42.0 ECM)

• EGS/AGS

• ABS/ASC

The main components of the EML system are:

• Accelerator pedal position sensor (PWG)

• Accelerator pedal position sensor (driver’s wish sensor - integrated in throttle housing,E46 MS42.0)

• Throttle valve assembly/assemblies with electronic control motor(s) - DK/MDK

• EML control module (MS42.0 ECM - E46)

3

EML SYSTEM OVERVIEW

Throttle valve control is managed electronically, using an electric motor(s), without the use ofmechanical linkages or cables (except E46 - MDK).

The EML system uses a microprocessor to convert the input signal for the position of theaccelerator pedal into output commands for control of the throttle valve. The position of thepedal is merely a request to the control module for throttle opening. The EML module pro-cesses this input request along with other pertinent operating parameters. The throttle valveis then moved to its proper position according to specific control unit programming.

The total scope of output control functions for the EML includes:

4

EML Control System Version Identification By Vehicle

BMW engine management systems have evolved through the model years. The evolution isdue to continued technical refinement and emission level compliancy.

Same version systems may be different from vehicle-to- vehicle. This additionally increasesthe number of system variations as well.

SNOISREV LEDOM ENIGNE RAEYLEDOM

2.1hcsoB 23E 07M 0991-8891

7.1hcsoB 13E 07M 4991-0991

3.1hcsoB 23E 03M 2991-1991

3.1hcsoB 43E 03M 3991-1991

7.1hcsoB 23E 07M 4991-1991

7.1hcsoB 13E 07S 5991-4991

sIIIsnemeiS 83E 37M tneserp-5991

sIIIsnemeiS 13E 37M 7991-5991

0.24SMsnemeiS 64E UT25M tneserp-9991

5

SYSTEM OVERVIEW - I-P-O

6

SYSTEM OVERVIEW - I-P-O

7

SYSTEM OVERVIEW - I-P-O

KL 15

MEMORY POWER

AUX KL 31

MAIN KL 31ECMRELAY

CRANKSHAFTPOSITION SENSOR

OPERATING POWER

IGNITION MONITOR

E46IHKA K-BUS

ROLLING CODE

CAMSHAFT POSITION SENSOR (2)

KNOCKSENSORS

ENGINE TEMPERATURE

2X 2XPRE & POSTCAT CONV.O2 SENSOR

MONITORING

THROTTLEPOSITION

AIRMASS SIGNAL

INTAKEAIRTEMP

OIL TEMPSENSOR

MDK

VEHICLE SPEED INPUTABS/ASC

LEAKAGE DIAGNOSIS PUMP+

RADIATOR OUTLETTEMPERATURE SENSOR

ECM RELAYCONTROL

FUEL PUMP RELAY CONTROL

AC COMPRESSORRELAY CONTROL

SECONDARY AIR INJECTIONAIR PUMP RELAY CONTROL

AIRINJ.SOL.

RUNLOSSSOL.

EXHAUST VANOS SOLENOID

INTAKE VANOS SOLENOID

IDLE CONTROL VALVE

PRE-CAT(2X)

POST-CAT(2X)

02 SENSOR HEATING

IGNITION COILS CONTROL (6X)

OBD II

DIAGNOSIS

DIS

CANTCM

P

M

OUTPUT STAGE

CHECKENGINE

PURGE VALVE CONTROL

INTAKE JET PUMP SOLENOID VALVE

SEQUENTIAL FUEL INJECTOR CONTROL (6X)

MDKMOTOR DRIVEN THROTTLE VALVE

RESONANCE-TURBULENCE INTAKE SYSTEM

COMPRESSOR CLUTCH

MAP-CONTROLLED

HEATED THERMOSTAT

THROTTLEPOSITION

(DK)

ABS/ASC

ELECTRIC FAN

LEAKAGE DIAGNOSIS

PUMP

+

M

MFL BUTTON PAD

CLUTCH SWITCHBRAKE LIGHT SWITCH

BRAKE LIGHT TEST SWITCH

CAN

I/O

BMW

SIEMENS

MS42.0E46

M52 TU

134 PINS

Programing Features

Throttle Motor ControlThrottle Valve optimum position for startingIdle Speed ControlCruise Control Engine Speed LimitVehicle Speed LimitDrive Torque Reduction (ASC)Drag Torgue Reduction (MSR)Safety MonitoringFail Safe FunctionsFault Monitoring with MemoryDiagnostic CommunicationFlash ProgrammableEWS 3.3

MoDiC

MoDiC