Checking components and wiring
Check the cable between control module terminal #10 and the signal terminal for the combustion fan (the black lead from the fan). Check for a short-circuit to supply voltage.
If no faults are found in the cable, the combustion fan must be replaced:
- For cars manufactured up to w38 2001 inclusive, see Fuel injection nozzle / fan motor / pressure equalizer, replacing
- For cars manufactured from w39 2001 inclusive, see Fuel injection nozzle / fan motor / pressure equalizer, replacing .
Remedy as necessary.
Other information:
- To access the control module or connect the breakout box, see Connecting the breakout box
- With the ignition on and the signal terminal for the combustion fan disconnected, the voltage between the signal terminal for the combustion fan (control module side) and ground must be approximately 0 V
- For other values, see Signal specification
- See Checking wiring and terminals .
- Continue
Refer to Verification