System Tests
NOTE:
Powertrain Control Module (PCM) monitors radiator cooling fan, cooling fan circuit and cooling fan relays and will store a Diagnostic Trouble Code (DTC) if a fault is detected. To diagnose an inoperative cooling fan, a Diagnostic Readout Box (DRBIII(R)) scan tool, volt/ohm meter and vehicle wiring diagrams are required. If DTC P0480 or P0481 are present, see appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE to retrieve DTCs and for detailed testing procedures.