Computers and Control Systems: Locations
Overview Of Location Components
Components A to I are not shown in the illustration.
A "MIL" exhaust emissions warning lamp
- In instrument cluster (Notes on warning lamp)
- See Fig. 1
B "EPC" warning lamp
- In instrument cluster (Notes on warning lamp)
- See Fig. 2
C Throttle Position (TP) sensor -G79- and Sender -2- for accelerator pedal position -G185-
- In footwell on accelerator pedal (both sensors are located in one housing)
- See Fig. 3
D Fuel pump (FP) relay -J17-
- In the micro central electrics unit behind driver's side storage compartment, relay position 4
- See Fig. 4
E Brake light switch -F- and Brake pedal switch -F47-
- In footwell on pedal bracket near brake pedal
- See Fig. 5
F Motronic Engine Control Module (ECM) power supply relay -J271-
- 3-way relay carrier in electronics box in plenum chamber, relay socket 3
- See Fig. 6
G Engine Control Module (ECM) -J220-
- In the electronics box in plenum chamber
H Secondary Air Injection (AIR) pump relay -J299-
- In 3 slot relay carrier; in electronics box in plenum chamber
- See Fig. 6
I Data Link Connector (DLC)
- Located in knee bolster on driver's side
1 Evaporative Emissions (EVAP) canister purge regulator valve -N80-
- See Fig. 7
2 Mass Air Flow (MAF) sensor -G70- with Intake Air Temperature (IAT) sensor -G42-
3 Connector retainer
- Connector positions
- See Fig. 8
4 Valve -1- for camshaft adjustment -N205-
- See Fig. 9
5 Camshaft Position (CMP) sensor -G40-
- Cylinder bank 1
- See Fig. 9
6 Engine Coolant Temperature (ECT) sensor -G62-
- On coolant pipe behind cylinder head, Bank 1
- See Fig. 9
7 Throttle valve control module -J338-
- With Throttle drive (power accelerator actuation) -G186-, Angle sensor -1- for throttle drive -G187- and Angle sensor -2- for throttle drive -G188-
- See Fig. 9
8 Oil pressure switch -F1-
- See Fig. 9
9 Fuel pressure regulator
10 Camshaft Position (CMP) sensor 2 -G163-
- Cylinder bank 2
- See Fig. 9
11 Connector retainer
- Connector positions
- See Fig. 10
12 Valve -2- for camshaft adjustment -N208-
- See Fig. 10
13 Ignition coils with output stages
- Cylinder bank 2
14 3 pin connector
- For Knock Sensor (KS) 3 -G198-
- For Knock Sensor (KS) 4 -G199-
- See Fig. 11
15 Secondary Air Injection (AIR) solenoid valve -N112-
- See Fig. 11
16 Intake manifold change-over valve -N156-
- See Fig. 11
17 3-pin connector
- For Knock Sensor (KS) 1 -G61-
- For Knock Sensor (KS) 2 -G66-
- See Fig. 11
18 Ignition coils with output stages
- Cylinder bank 1
19 Secondary Air Injection (AIR) pump motor -V101-
- Below longitudinal member, right side
- See Fig. 12
Fig. 1 "MIL" exhaust emissions warning lamp
If the engine control module detects faults affecting the emission control
system, this is indicated by the exhaust emissions warning lamp.
Location of exhaust emissions warning lamp
NOTE: The exhaust emissions warning lamp can either flash or switch on continuously. In both cases check the fault memory.
Flashing light
- This indicates a fault which will cause damage to the catalytic converter if the vehicle is driven further under the current conditions. If the warning lamp is flashing, the vehicle should only be driven with reduced power until the MIL goes out or remains on continuously. The fault should be corrected as soon as possible.
Continuous light
- This indicates a fault that causes an increase in exhaust emissions. Interrogate the fault memory of the engine control module and automatic transmission (if equipped).
- If the vehicle does not run properly, or the customer reports driveability problems, and the exhaust emissions warning lamp does not light up, check the function of the warning lamp and then interrogate the fault memory. The fault memory may have stored faults which are not indicated immediately by the exhaust emissions warning lamp.
Fig. 2 EPC warning lamp
"EPC" stands for Electronic Power Control and refers to the electronic throttle control system.
Location of EPC warning lamp
The engine control module switches the EPC warning lamp on when the ignition is switched on.
After the engine has been started, the engine control module tests all parts for faults relating to the electronic throttle control system.
During the test sequence the EPC warning lamp lights up for about 3 seconds. If a fault is detected during this test phase the warning lamp will remain lit.
If a fault is detected in the electronic throttle control system while the engine is running, the engine control module will activate the EPC warning lamp. At the same time a fault code is stored in the fault memory of the engine control module.
Fig. 3 Location Throttle Position (TP) sensor -G79- and Sender - 2- for accelerator pedal position -G185-
- Incorporated in accelerator pedal module (arrow)
Fig. 4 Location of Fuel pump (FP) relay -J17-
- In the micro central electrics unit behind storage compartment on driver's side, position 4
Fig. 5 Location of Brake light switch -F-, Brake pedal switch -F47- and Clutch vacuum vent valve switch -F36-
1 Clip
2 Brake light switch -F-, Brake pedal switch -F47-
3 Clutch vacuum vent valve switch -F36-
NOTE: To ensure a secure fit, the switches may be installed only once.
Fig. 6 Locations of components in electronics box in plenum chamber
2 Secondary Air Injection (AIR) pump relay -J299-
3 Motronic ECM power supply relay -J271-
7 Fuse -S130- for secondary air injection pump
Fig. 7 EVAP canister purge regulator valve -N80-
Fig. 8 Connector retainer
1 4-pin connector for Oxygen Sensor (O2S) Behind Three Way Catalytic Converter (TWC) -G130- and Oxygen Sensor (O2S) Heater 1 Behind Three Way Catalytic Converter (TWC) -Z29- (cylinder bank 1)
2 4-pin connector for Heated Oxygen Sensor (H)2S) -G39- and Oxygen Sensor (O2S) heater -Z19- before catalytic converter (cylinder bank 1)
3 Connector for starter and Generator
4 2-pin connector for camshaft timing adjustment (cylinder bank 1)
Fig. 9 View from rear
1 Valve -2- for camshaft adjustment -N208-
2 Camshaft Position (CMP) sensor 2 -G163-, cylinder bank 2
3 Oil pressure switch -F1-
4 Throttle valve control module -J338-
5 Engine Coolant Temperature (ECT) sensor -G62-
6 Camshaft Position (CMP) sensor -G40-, cylinder bank 1
7 Valve -1- for camshaft adjustment -N205-
Fig. 10 Connector retainer beneath coolant expansion tank
1 4-pin connector for Heated Oxygen Sensor (HO2S) 2 -G108- and Oxygen Sensor (O2S) Heater 2 -Z28- before catalytic converter (cylinder bank 2)
2 3-pin connector for Engine speed (RPM) sensor -G28-
3 2-pin connector for camshaft timing adjustment (cylinder bank 2)
4 4-pin connector for Oxygen Sensor (O2S) 2 Behind Three Way Catalytic Converter (TWC) -G131- and Oxygen Sensor Heater 2 Behind Three Way Catalytic Converter (TWC) -Z30- (cylinder bank 2)
Fig. 11 View from front
1 Vacuum unit for intake manifold change-over
2 Knock Sensor (KS) 1 -G61-
3 Knock Sensor (KS) 2 -G66-
4 Intake manifold change-over valve -N156-
5 Secondary Air Injection (AIR) solenoid valve -N112-
6 Knock Sensor (KS) 3 -G198-
7 Knock Sensor (KS) 4 -G199-
Fig. 12 Secondary Air Injection (AIR) pump motor -V101-
