Computers and Control Systems: Service and Repair

Injection System, Servicing





The components A, B and C are not shown on the illustration.

A. Brake pedal switch -F47- or Brake light switch -F
^ Together in one housing in footwell
B. Throttle Position (TP) sensor -G79- and Sender -2- for accelerator pedal position -G185
^ In footwell at accelerator pedal
C. Clutch vacuum vent valve switch -F36
^ In footwell

1. Evaporative Emissions (EVAP) canister purge regulator valve -N80
2. Camshaft Position (CMP) sensor -G40
^ In cylinder head cover
^ Controlled by engine control module
3. Intake manifold
4. Throttle valve control module -J338
5. Positive Crankcase Ventilation (PCV) heating element -N79
6. Secondary Air Injection (AIR) Solenoid Valve -N112
7. 81-pin connector
8. Motronic Engine Control Module (ECM) -J220
9. 40-pin connector
^ Only disconnect or connect with ignition switched off
10. Mass Air Flow (MAF) sensor -G70- with Intake Air Temperature (IAT) sensor -G42
^ Gold plated contacts
11. Protective housing for relays
12. Engine Coolant Temperature (ECT) sensor -G62
13. Air cleaner
14. Protective housing
15. Ignition coils with final output stages -N70-, -N 127-, -N291-, -N292
16. Engine speed (RPM) sensor -G28
17. Secondary Air Injection (AIR) pump motor -V1 01 -
18. Injector (-N30-, -N31-, -N32-, -N33-)
19. Knock Sensor (KS) 2 -G66
20. Knock Sensor (KS) 1 -G61
21. 4-pin connector
22. Oxygen Sensor (OS2) Behind Three Way Catalytic Converter (TWC) -G130-, 50 Nm
^ Installed location: in rear of catalytic converter
23. 6-pin connector
^ Black for Heated Oxygen Sensor (HO2S) -G39- and Oxygen Sensor (OS2) Heater -Z19
^ Gold plated contacts
^ Installed location: On right on underside of vehicle, Refer to Fig 2
24. Heated Oxygen Sensor (HO2S) -G39-, 50 Nm
^ Installed location: In exhaust manifold
25. Fuel pressure regulator





Fig. 1 Position of relays in protective housing (on left in engine compartment)

1. Secondary Air Injection (AIR) pump relay -J299-, Distinguishing features: Control number 100
2. Motronic Engine Control Module (ECM) power supply relay -J271-, Distinguishing features: Control number 428

Note:
^ The relay locations may differ depending on level of equipment.
^ For latest control numbers and installed locations:
^ Electrical Wiring Diagrams, Troubleshooting & Component Locations
^ Disconnect battery Ground strap first if tools are required to pull relays or control modules out of the relay plate.
^ Before disconnecting the battery Ground strap obtain code for radios with anti-theft coding.





Fig. 2 Location: 6-pin connector -1- for Heated Oxygen Sensor (HO2S) before catalytic converter.





Fig. 3 Location: 4-pin connector -1- for Heated Oxygen Sensor (HO2S) before catalytic converter.