Troubleshooting ECM

Replacing Thermostat

NOTE: This diagnostic trouble code (DTC) is stored if the engine temperature sensor freezes. This may happen if the coolant level is low or there is too little glycol in the coolant. Check the coolant level and its freezing point.

Engine control module (ECM) has registered that the actual temperature increase has deviated from the calculated temperature increase. This deviation is probably due to a damaged thermostat.

Check cables and connectors between engine control module (ECM) and engine temperature sensor for contact resistance and oxidation.

Remedy as necessary.

Other Information
- Signal specification, engine control module (ECM)
- Thermostat, replacing
- Temperature sensor engine coolant, replacing
- Checking wiring and terminals

Continue: Refer to Fault-Tracing Information - Interrupted Fault.