Conditions Which Generate This Code:
The Engine Control Module (ECM) detects the following conditions:
• The signal voltage from the engine coolant temperature sensor is greater than 4.95 VDC for
more than eight seconds.
• The ECM has been powered for at least two seconds.
• The engine has been running for more than seven minutes.
System Response:
The ECM will log the diagnostic code and the ECM will trigger a snapshot. The check engine lamp
will illuminate once this diagnostic code has been active for more than ten hours. The ECM will default to 90 C (194.0 F) for engine coolant temperature.
The ECM will activate the cooling fan after this code has been active for more than eight seconds.
Possible Performance Effect:
None
Troubleshooting:
Perform the following diagnostic procedure: “Engine Temperature Sensor Open or Short Circuit – Test”
Results:
• OK – STOP.
