auto service test review - school district of · pdf fileauto service test review ... tbi vs....

Auto Service Test Review

For the Most Effective Personal Review, Match the Following Questions to the OnLine Study Guide Multimedia

Auto Service Test Review

Test #5 84 Questions

Covering Chapters: 20 & 21, 22 & 23, 27, 43 & 44

For the Most Effective Personal Review, Match the Following Questions to the OnLine Study Guide Multimedia

Chapter 20 Info to Know 1. Gasoline is a hydrocarbon fuel HC 2. Octane rating is ability to resist detonation 3. High Octane with high compression ratios

Chapter 20 Info to Know 5. Stoichiometric Air:Fuel Ratio 14.7:1 6. Lean is more air than stoichiometric

Rich is less air than stoichiometric

Best CAT Efficiency

Chapter 20 Info to Know 7 & 8. Detonation & Preignition 9. Dieseling or Runon (caused by a dripping injector)

Chapter 21 Info to Know

12. Fuel Tank Construction 13. Fuel Tank Caps Not Vented to Atmosphere 14. Pickup Sending Unit


15. Fuel Rail 16. Fuel Filters 17 & 18. Fuel Pumps


20. Inertia Fuel Shutoff Switch 22. Importance of the Air Filter!!


3. Catalytic Converter purpose & location 6. Muffler purpose & location


Platinum & Palladium

Rhodium

8. Normally & Artificially Aspirated Engines 9. Super Chargers = BeltDriven 10. Turbo Chargers = ExhaustDriven


9 & 10. Both increase Volumetric Efficiency 13. Intercooler, turbines & compressors 14. Waste Gate & Bypass Valve Purpose 18. Turbo Lag


Intercooler

1. Electronic Fuel Injection 2. Advantages of EFI & Computer Controls 3. Pressure Differences Cause Flow 48. TBI vs. MFI, Direct vs. Indirect, GDI

Chapter 22 & 23 Info to Know

MPG Driveability

Low Emissions

9. Fuel Pressure Regulator 10. A Fuel Injector is a really a Solenoid


12. Sensors!! & how they input data to PCM 13. Actuators & how they follow PCM commands


14. Exhaust Gas Oxygen Sensor operation


Lean Exhaust = Lots of 0 2 Rich Fuel Trim Command

Rich Exhaust = Not Much 0 2 Lean Fuel Trim Command


Closed Loop Warm to Hot Coolant (>140°) Running More Than 2 Minutes Active & Responsive Upstream HO2S

Open Loop Cold Coolant (<140°) Running Less Than 2 Minutes Inactive Upstream HO2S

MPG Driveability

Low Emissions

15. Open Loop Operational Mode 16. Closed Loop Operational Mode

1722. Major Sensors & what they sense


A/F Wide Range Air/Fuel Sensor = Resistant Titanium O2 BPP/BOO Brake Pedal Position or Brake OnOff BARO Barometric Pressure ECT Engine Coolant Temperature CKP Crankshaft Position CMP Camshaft Position EVP EGR Valve Position IAT Intake Air Temperature KS Knock Sensor MAP Manifold Absolute Pressure (Vacuum for Load Indicator) MAF Mass Air Flow NDS NeutralDrive Switch (Also Park/Neutral Switch or PRNDL) HO 2 S Heated Oxygen Sensor PS Power Steering Pressure Switch TPS Throttle Position Sensor VSS Vehicle Speed Sensor

24. Injector Pulse Width is “ontime” (milliSeconds) 30. OBD (abbreviation & concept) (I & II) 31. DTC = Diagnostic Trouble Codes 32. Malfunction Indicator Light


OnBoard Diagnostic

33. Scan Tool & its use 34. Fuel Trim is mixture adjustment 35. Oxygen Sensors have heaters 36. Noid Light to check injector pulse from PCM 37. Injectors may need cleaning

Flooded Engine & Clear Flood Mode Sensor Failure & Limpin Mode Adaptive Strategy for Engine Management


1. Reasons for Emission Control Systems 2. Who & What is the EPA 3. Smog


4 & 5. Hydrocarbon Pollution makeup/cause 6. Carbon Monoxide pollution makeup/cause 7. Oxides of Nitrogen pollution makeup/cause 8. Particulate Pollution = soot & carbon 9. Where does automotive pollution come from?


HC: No Burn

CO: Burn with Insufficient O 2

HC: Evaporation

NOx: Burn too hot

1015. Major Emission Control Systems

CAT Catalytic Converter (HC, CO, NOx) AIR Air Injection System (HC & CO) PCV Positive Crankcase Ventilation (HC & CO)

TAC Thermostatic Air Cleaner (HC & CO) EVAP Evaporative System (HC only) EGR Exhaust Gas Recirculation (NOx only)


16. PCV Valve


16. Evaporative Charcoal Canister


17. Exhaust Gas Recirculation


24. What is a Catalyst? 25. Catalytic Converter Operation 26. Platinum & Palladium oxidize HC & CO 27. Rhodium reduces NOx


31. Downstream HO2S is a Catalyst Monitor


A/F Control

Catalyst Monitor

28. PCM 29. EGOS or HO2S 30. Zirconium is in an Oxygen Sensor


32. Misfire = No Burn…Results in HC pollution 33 & 34. Exhaust Gas Analyzers & 5 Gases 35 & 36. IM/240 & VECI


Know the EEC System • Engine at the center • PCM & Others on the C.A.N. • Input Sensors Named & Data Stream • Output Controls Named & Data Stream • MIL as an output from the PCM • DLC as a tap into the PCM for scanners

Know the EEC System

Auto Service Test #5

Parts & Tools

These are:

PCM’s MP3 Players Ignition Coils Catalytic Converters

These are:

PCV Valves Oxygen Sensors EGR Valves Catalytic Converters

These are:

Inertia Fuel Shutoff Switches Head Light Switches MultiFunction Switches Oil Pressure Switches

These are:

Cookie Canisters EGR Valves Fuel Pumps EVAP Charcoal Canisters

These are:

EGR Valves Purge Solenoids PCV Valves Fuel Injectors

These are:

Oil Pumps Fuel Pumps Waste Gates Turbochargers

These are:

Oil Filters Air Filters Cabin Air Filters Fuel Filters

These are:

Oil Filters Air Filters Fuel Injectors Turbochargers

These are:

Purge Valves Oxygen Sensors Fuel Injectors PCV Valves

These are:

Hybrid Engines Super & Turbo Chargers Fuel Rails Fuel Tank Sending Units

More than you want to know…

EEC, Fuel Injection, and Emission Parts & Tools

PCM Charcoal Canister Oxygen Sensor Oxygen Sensor DLC Fuel Injector Scan Tool Fuel Tank Cap Catalytic Converter Gas Cap Pressure Tester Fuel Filter Mass Air Flow Sensor Fuel Pump Air Filter Inertia Fuel Shutoff Switch Fuel Tank Sending Unit EGR Valve Intake Manifold PCV Valve Exhaust Manifold

PCM ECM

Powertrain Control Module

PROM Chips..integrated circuits

Programmable Read Only Memory Chips… permanent, unlike the RAM RAM temporarily stores DTC’s

Diagnostic Link Connectors (DLC) OBD I & OBD II

Throttle Position Sensors

Potentiometers…3 connections

Manifold Air Temperature or Intake Air Temperature Sensors

Negative Temperature Coefficient Thermistors Temperature up = Resistance down

Manifold Absolute Pressure Sensors

3wire, voltage reference sensors

At KOEO MAP = Barometric

Idle Air Control Motors…IAC

ChryslerDodgeJeep

General Motors

Ford

Heated Exhaust Gas Oxygen Sensors

S1 = upstream “before the CAT” A/F adjustment

S2 = downstream “after the CAT” Catalyst efficiency

Crankshaft & Camshaft Position Sensors

RPM Signal

Engine Coolant Temperature Sensors

Vehicle Speed Sensors

DPFE…Delta Pressure Feedback EGR Position Transducers

Some engines use MAP variation to signal EGR obedience

Inertia Fuel Shutoff Switch

Mass Air Flow Sensors

Hot Wire Hot Film

“Counts” the amount of air going in to the engine

CKP & CMP

Crank RPM Signal For Spark

Cam RPM Signal For Fuel Injection

Thermal Vacuum Valves…sensitive to coolant temperature & used to switch vacuum on and off to devices like advance units & EGR valves

Vacuum Solenoids

Canister Purge & EGR Regulators

Emission Control Actuators

Idle Speed Control Motors…NOT Idle Air Control Motors

Often called throttle kickers since they could step up the

idle speed by actually opening the throttle as needed when

more accessories were turned on

Vacuum Solenoids…EVAP Purge & EGR Regulator,

Emission Control Actuators

Fuel Tank Sending Unit

Relays

Air Pump

Air Injection Manifold

Air Check Valve

Secondary Air System Air Injection System

Secondary Air Diverter Valves…also called Air Management Valves

Inoperative “gulp valves” can cause backfire on deceleration

Evaporative Charcoal Canisters

Used to reduce HC

Round fiberglass filter goes here

PCV Filter

Evaporative Canister with vapor management valves & fuel tank pressure sensor

Canister Purge Valve & Canister Vent Valve

Purge to engine during closed loop Vent so you can fill the fuel tank

Evaporative Service Port Valve Covers… lefthanded shrader valve inside

Positive Crankcase Ventilation Valves…PCV

Moves “blowby” gasses from the crankcase into the incoming A/F stream

Exhaust Gas Recirculation Valves…EGR

System used to reduce NOx

EGR Valve Variations

Thermostatic Air Cleaner Vacuum Motor & Heat Tube

Early Fuel Evaporation Heaters…used mostly on Carburetor & TBI

EGR Vacuum Regulator Solenoids

Allows the PCM to electronically switch vacuum to a normal EGR valve

4 cylinder “wet” intake manifold for TBI

IAT

EGR Valve

Coolant inlet

Vacuum taps

Brake Booster Hose

V6 wet intake manifold

Tstat goes here

Throttle Body Fuel Injection Units

ISC Motor

Fuel Pressure Regulator

TPS

IAC Motor

TPS

Multiport Fuel Injection Rail with vacuum fuel pressure regulator

Fuel Pressure Regulators

Note: Tiny Filter Screen on Regulator

Throttle Body…NOT Throttle Body Fuel Injection

IAC Motor

TP Sensor

Brake Booster Vacuum Tap

Fuel Pulsation Dampeners

Fuel Pump & Tank Sending Unit

Assembly

Fuel Filter

Fuel Level Wiper… Rheostat

Float for the Fuel Gauge

Fuel Filter Sock

Fuel Pump & Tank Sending Unit Assembly

Float for the Fuel Gauge

Inertia Fuel Shutoff Switches (IFS)

Electric Fuel Pumps & Filters

Mechanical Fuel Pumps

For Carbureted Engines Only

Fuel Filters

Fuel Filter Tether

Fuel Filter Clips

Engine Air Filter

MPFI Rails with Vacuum Pressure Regulators

Central Multiport Fuel Injection

1 Injector

Pressure Regulator

6 Poppet Nozzles

Also Called Unitized Injection

Fuel Injectors

Electric Fuel Pump

Super Charger

ByPass Valve or “Waste Gate” Actuator

SolenoidControlled, VacuumOperated, ByPass Valve Actuator for the Super Charger

Turbocharger Compressor Wheel “Cold Wheel”

Turbocharger Turbine Wheel “Hot Wheel”

Turbo Charger

auto service test review - school district of · pdf fileauto service test review ... tbi vs....

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