Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information ECM-200A

Condition




The diagnostic trouble code (DTC) is stored if the engine control module (ECM) detects that the value from the engine coolant temperature (ECT) sensor deviates too much from the values for intake and outside temperatures after the engine has been switched off for an extended period.
The diagnostic trouble code (DTC) can be diagnosed at ignition after the engine has been allowed to cool for approximately 8 hours.

Substitute value
- When starting: The intake air temperature (IAT) is used if no fault has been detected on the intake temperature sensor Otherwise the constant +20 °C is used
- After starting: The engine coolant temperature (ECT) is calculated based on a model
- The cooling fan runs at low-speed.

Possible source
- Contact resistance in the connector
- Damaged engine coolant temperature (ECT) sensor.

Fault symptom[s]
- Malfunction indicator lamp (MIL) lit
- Engine difficult to start when warm
- Uneven idle
- The engine stops, but only when it is at operating temperature
- The engine cooling fan (FC) runs continuously even when the ignition is switched off.