Diagnostic Test

Ignition on, engine not running.

With a scan tool, actuate the Cooling Fan through the PCM Actuators.

Is the Cooling Fan operating? 

Yes 

1. Refer to the INTERMITTENT CONDITION Diagnostic Procedure.

No 

1. Go To  2.

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

Yes 

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

No 

1. Go To  3.

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

Yes 

1. Diagnose the appropriate Cooling Fan Control Circuit DTC in the TIPM.

No 

1. Go To  4.

Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Relay, Totally Integrated Power Module (TIPM), and the Powertrain Control Module (PCM).

Look for any chafed, pierced, pinched, or partially broken wires.

Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the Relay, Totally Integrated Power Module (TIPM), and the Powertrain Control Module (PCM) connectors.

Refer to any Technical Service Bulletins that may apply.

Were there any problems found? 

Yes 

1. Repair as necessary.
2. Perform POWERTRAIN VERIFICATION TEST .

No 

1. Replace and program the Powertrain Control Module per Service Information.
2. Perform POWERTRAIN VERIFICATION TEST .