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 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 .
- See Checking wiring and terminals .
- Continue
Refer to Verification