Checking components and wiring
Check the cable between combustion preheater module (CPM) terminal #10 and the signal terminal for the combustion fan (the black lead from the fan). Check for a short-circuit to supply voltage.
The combustion fan must be replaced if no faults are found in the cable.
Remedy as necessary.
Other information
- See Connecting the breakout box
- See Signal specification
- 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 .
- See Checking wiring and terminals
- Continue
Refer to Verification
Check the cable between combustion preheater module (CPM) terminal #10 and the signal terminal for the combustion fan (the black lead from the fan). Check for an intermittent short-circuit to supply voltage.
Remedy as necessary.
Other information
- See Connecting the breakout box
- To access the combustion fan:
- 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 .
- See Signal specification
- See Water pump engine coolant heater, replacing
- See Checking wiring and terminals
- Continue
Refer to Verification