Diagnosis

If a problem that involves the low speed cooling fan relay control circuit (cooling fan #1 relay control) exists, DTC P1651 should set. If the problem affects the high speed cooling fan relay control circuit (Cool Fan #2 and Cool Fan #3 Relay 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. The Electric Cooling Fan Diagnosis table should be used to diagnose the PCM controlled cooling fans only if no DTC is set.