P0480-COOLING FAN 1 CONTROL CIRCUIT





For a complete wiring diagram Refer to Section 8W.


  • When Monitored:

    With the ignition on. Battery voltage greater than 10 volts.

  • Set Condition:

    The PCM is requesting the TIPM to turn on the Cooling Fan On and it is not operating. One Trip Fault. Three good trips to turn off the MIL.


Possible Causes
  
CAN C BUS FAILURE
  
ENGINE COOLANT TEMP SENSOR DTCS SET
  
COOLING FAN CONTROL CIRCUIT DTCS SET IN THE TIPM
  
PCM
  

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).



Diagnostic Test

1.COOLING FAN RELAY OPERATION




Is the Cooling Fan operating?

Yes


No
  • Go To 2

2.CAN C or ECT DTCS CURRENTLY ACTIVE


Are any CAN C or ECT DTCs Active at this time?

Yes
  • Refer to the appropriate diagnostics for the ECT Sensor or CAN C Bus DTC.


No
  • Go To 3

3.COOLING FAN CONTROL CIRCUIT DTCS SET IN THE TIPM


Are any Cooling Fan Control Circuit DTCs set in the TIPM?

Yes
  • Diagnose the appropriate Cooling Fan Control Circuit DTC in the TIPM


No
  • Go To 4

4.PCM

NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.




Were there any problems found?

Yes


No