Century V6-3100 3.1L VIN M SFI (1998)
Voltage Signal: Testing and Inspection
Engine Cooling Fan Signal
Important: When certain Diagnostic Trouble Codes (DTCs) are present, the PCM may command the cooling fans to run all the time. It is important
to perform the Powertrain On-Board Diagnostic System check prior to diagnosing the engine cooling fans. See: Testing and Inspection
Diagnosis
If a problem that involves the low speed cooling fan relay control circuit (cooling fan relay #1 control) exists, DTC P1651 should set. If the problem
affects the high speed cooling fan relay control circuit (cooling fan relay #2 and #3 control), DTC P1652 should set. A problem with the ECT sensor
should set DTC P0117, P0118, P1114, or P1115. Any of these DTCs will affect cooling fan operation and should be diagnosed before using the
Electric Cooling Fan Diagnosis table. Refer to System Diagnosis / Diagnostic Tables / Diagnostic Trouble Code Tables. See: Testing and Inspection
The Electric Cooling Fan Diagnosis table should be used to diagnose the FCM controlled cooling fans only if no DTC is set. Refer to System
Diagnosis / Diagnostic Tables / System Diagnostic Tables. See: Testing and Inspection
