Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information ECM-274C

Condition




Engine Control Module (ECM) checks the signal for engine temperature. If the engine temperature (signal) exceeds a certain limit, the control module checks current operating condition and compares to a calculated engine temperature. Calculations are based on, among other things, speed and load. If the signal from the engine temperature sensor matches a temperature that is higher than a certain limit value and is not reduced within a certain time, the control module interprets this as a malfunction and the diagnostic trouble code (DTC) is generated.
The diagnostic trouble code (DTC) can be diagnosed when the engine is running.

Substitute value
- The engine coolant temperature (ECT) is calculated based on a model.

Possible source
- Damaged engine coolant temperature (ECT) sensor.
- Contact resistance or oxidation in the terminals.
- Insufficient coolant in cooling system.
- Damaged thermostat.
- Clogged radiator.

Fault symptom[s]
- Malfunction indicator light (MIL), on
- Engine is difficult to start