Engine Control Module, Component Layout

Motronic ECM, component layout






1 - Motronic ECM harness connector
- before removing ignition must have been switched off for a minimum of 20 seconds
- 68 pin
2 - Motronic engine control module (ECM) (J 220)*
- installation location drivers side of plenum panel in engine compartment
- with DTC MEMORY (Fault memory)
- idle speed and ignition timing point checking/adjusting Testing and Inspection
3 - ECM mounting plate
4 - Heated Oxygen sensor (HO2S) (G 39)*
- 50 Nm
- installation location, front exhaust pipe
- coat threads with G5 but do not allow G5 to contact slotted area of sensor tip
To check heater voltage supply:
- switch Fluke 83 multimeter to 20 Volt range
- connect multimeter between terminals 1 (red/white) and 2 (brown)
- start engine and let idle
- must be approx. battery voltage
5 - Engine coolant temperature (ECT) sensor (G 62)*
- blue
- 2-pin
- checking Testing and Inspection
6 - Retaining clip
check for secure fit
7 - 0-ring
8 - Harness connector for blue ECT sensor
9 - Engine speed (RPM) sensor (G 28)*
10 - Spacer
11 - Harness connector for HO2S sensor
- 4-pin
- for HO2S and HO2S heater
- fastened to rear engine mount facing front of vehicle