Intermittent fault
Check circuit between control module #11 and the components which are connected to the supply circuit (water pump terminal 1, fuel pump (FP) terminal 2 and combustion fan supply terminal). Check for an intermittent short-circuit to supply voltage.
Remedy as necessary.
Other information:
- To access the control module or connect the breakout box, see Connecting the breakout box
- To access or replace the water pump, see Water pump engine coolant heater, replacing
- To access or replace the fuel pump (FP):
- For cars manufactured up to w38 2001 inclusive, see Fuel pump, auxiliary heater, replacing
- For cars manufactured from w39 2001 inclusive, see Fuel pump auxiliary heater, replacing .
- To access or replace the blower 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 .
- With the ignition on and the water pump connector disconnected, the voltage between water pump terminal 1 (control module side) and ground should be approximately 0 V
- For other values, see Signal specification
- See Checking wiring and terminals .
- Continue
Refer to Information