CID 0544 FMI 08 Engine Cooling Fan Speed signal abnormal
Conditions Which Generate This Code:
After the engine speed has been above low idle for one minute, a fan speed of less than 38 rpm, or a fan speed of more than 2000 rpm is detected for at least 1.9 seconds.
System Response:
The Electronic Control Module (ECM) logs the diagnostic code. The ECM flags fan speed as invalid data. The ECM defaults to maximum fan speed for operation of the fan control solenoid.
Test Step 1. Perform the following diagnostic procedure: Engine Fan Speed Sensor Circuit - Test
Results:
- OK - STOP
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