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HOMESERVICE MANUALSJEEP2008LIBERTY SPORT, RWD, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCETESTING & DIAGNOSISDTCS P0420 TO P0563P0480-COOLING FAN 1 CONTROL CIRCUITDIAGNOSTIC TEST
2008 Jeep Liberty Sport, RWD, Automatic

Diagnostic Test

2008 Jeep Liberty Sport, RWD, AutomaticSECTION Diagnostic Test
  1. ACTIVE DTC 

    Turn the ignition on.

    Start the engine and allow it to reach operating temperature.

    WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death.

    With a scan tool, select View DTCs.

    Is the DTC Active at this time? 

    Yes 

    1. Go To  2.

    No 

    1. Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
  2. CAN C or ECT DTCS CURRENTLY ACTIVE 

    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.
  3. COOLING FAN CONTROL CIRCUIT DTCS SET IN THE TIPM 

    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.
  4. POWERTRAIN CONTROL MODULE (PCM) 

    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 .
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.