Checking components and wiring
Check the resistance of the engine coolant temperature sensor. For the resistance values, see Components resistance values .
Remedy as necessary.
Other information:
- To access or replace the engine coolant temperature sensor:
- For cars manufactured up to w38 2001 inclusive, see Overheat protection thermostat / flame sensor / engine coolant temperature sensor, replacing
- For cars manufactured from w39 2001 inclusive, see Replacing the overheat protection thermostat, the flame sensor and the engine coolant temperature sensor .
- For other values, see Signal specification .
- Continue
Refer to Verification
Check the fuel pump (FP) and the control module connectors. Check for contact resistance and oxidation.
Check the cable between control module terminal #13 and fuel pump (FP) terminal 1. Check for an intermittent open-circuit.
Check the cable between control module terminal #11 and fuel pump (FP) terminal 2. Check for an intermittent open-circuit.
Diagnostic trouble code (DTC) CEM-5F3B Water pump, signal and / or diagnostic trouble code (DTC) CEM-5F3D Combustion fan, signal may also be stored if there is a fault in the power cable.
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 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 overheat protection thermostat:
- For cars manufactured up to w38 2001 inclusive, see Overheat protection thermostat / flame sensor / engine coolant temperature sensor, replacing
- For cars manufactured from w39 2001 inclusive, see Replacing the overheat protection thermostat, the flame sensor and the engine coolant temperature sensor .
- See Checking wiring and terminals .
- Continue
Refer to Verification