Diagnostic Trouble Code (DTC) Information

ECM-P011800 Coolant Temperature Circuit High Input Signal


Condition







The engine control module (ECM) monitors the engine temperature using a sensor.

The diagnostic trouble code (DTC) is stored if the Engine Control Module (ECM) detects that the signal from the engine coolant temperature (ECT) sensor is too high.

The diagnostic trouble code can be diagnosed when the ignition is on.

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
- The signal cable is short-circuited to voltage.
- Open-circuit in the signal cable.
- Damaged engine coolant temperature sensor.

Fault Symptom[s]
- Malfunction indicator lamp (MIL) lit.
- Engine reluctant to start.
- Uneven idle.
- Engine stops.
- The engine cooling fan (FC) runs continuously even when the ignition is switched off.