Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information

Condition




The engine control module (ECM) monitors the engine temperature using a sensor.
A DTC is stored if the control module detects that the coolant temperature deviates too much from the air temperature, the air temperature (measured in the mass air flow (MAF) sensor), the temperature measured in the boost pressure sensor (between the turbo compressor and throttle) or the fuel temperature, after the engine has been switched off for a long time.
The diagnostic trouble code is diagnosed at ignition on once per driving cycle, but only when the fuel temperature has dropped by at least 20 °C and has ended up near the outdoor temperature from the previous driving cycle.

Substitute value
- During start-up: The intake air temperature (IAT) is used if no fault has been detected on the intake temperature sensor
- After start-up: The engine coolant temperature (ECT) is calculated based on a model.
- Engine cooling fan (FC) is activated at the predefined speed.

Possible source
- Contact resistance in connector.
- Damaged engine coolant temperature sensor.

Fault symptom[s]
- Starting/Engine stalls
- Starting/Engine hard to start/cranks slowly/Unsure when/at all times
- Idling/Uneven idle
- Driving/Engine stalls/Unsure when/at all times
- Warning lights and chimes/Malfunction Indicator Light ("Check engine" light) indication/no indication
- Engine cooling/Engine cooling fan (FC) always activated