Checking The Component
WARNING:
Engine cooling fan (FC) can also operate if the ignition is switched off when this diagnostic trouble code (DTC) is stored.
HINT: To avoid injury, disconnect the power supply to the engine cooling fan (FC) during fault-tracing.
- Check the connector on the engine coolant temperature (ECT) sensor. Check for contact resistance and oxidation.
This diagnostic trouble code (DTC) is stored if the engine coolant temperature (ECT) sensor freezes. This may happen if the coolant level is low or there is too little glycol in the coolant. Check the engine coolant level and its freezing point.
HINT: The diagnostic trouble code (DTC) can be caused by a thermostat that doesn't open.
Replace the engine coolant temperature (ECT) sensor if the above does not remedy the fault.
Remedy as necessary.
Other information
- For B5xx4T, see REPLACING THE THERMOSTAT AND/OR ENGINE COOLANT TEMPERATURE SENSOR
- For B6xx4T, see ENGINE COOLANT TEMPERATURE (ECT) SENSOR, REPLACING .
- see CHECKING WIRING AND TERMINALS
- Continue
Refer to VERIFICATION