Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information ECM-270B

Condition




The engine control module (ECM) checks the signal for engine coolant temperature (ECT).
As soon as the engine is started the temperature is calculated theoretically. The diagnostic trouble code (DTC) is stored if the calculated temperature exceeds the engine coolant temperature (ECT) sensor signal.
The diagnostic trouble code (DTC) can be diagnosed when the engine is running.

Substitute value
- Initial boost pressure
- The engine coolant temperature (ECT) is calculated based on a model. Three-way catalytic converter (TWC) heating and fuel trim at start (starting trim), idle diagnostic and misfire diagnostic are disabled
- The engine cooling fan (FC) runs at a predefined speed.

Possible source
- Damaged temperature sensor
- Damaged coolant thermostat.

Fault symptom[s]
- Malfunction indicator lamp (MIL) lit
- The engine is difficult to start.