Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information

Condition




Diagnostic trouble code (DTC) ECM-15 is stored if the engine coolant temperature (ECT) sensor circuit is short-circuited to ground or voltage or if there is an open-circuit in the circuit.

Substitute value
- The engine coolant temperature (ECT) is calculated theoretically after start
- Initial boost pressure
- The A/C is switched off
- No heated oxygen sensor (HO2S) diagnostics
- No idle air trim adaptation
- No leak diagnostic.

Possible source

Signal too high:
- Short-circuit to supply voltage in the signal cable
- Open-circuit in the signal cable or ground lead
- Faulty engine coolant temperature (ECT) sensor
- Contact resistance and oxidation.

Signal too low:
- Short-circuit to ground in signal cable
- Faulty engine coolant temperature (ECT) sensor.

Fault symptom[s]
- Difficult to start
- The engine cooling fan (FC) operates constantly
- Low idling speed
- High idling speed
- Malfunction indicator lamp (MIL) lit.