Checking the supply circuit
- Ignition off
- Remove the heater.
Check the circuit between combustion preheater module (CPM) terminal #11 and the components which are connected to the supply circuit (water pump terminal 2, fuel pump (FP) terminal 2 and combustion fan supply terminal). Check for a short-circuit to supply voltage.
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.
Remedy as necessary.
Other information:
- See Connecting the breakout box
- See Signal specification
- For cars manufactured up to w38 2001 inclusive, see Engine coolant heater, replacing
- For cars manufactured from w39 2001 inclusive, see Engine coolant heater, replacing .
- See Water pump engine coolant heater, replacing
- 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 .
- 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