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Diagnostic Test

WARNING: This page is about a different car, the 2005 Jeep Grand Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
  1. 1)  HIGH SPEED RADIATOR FAN RELAY OPERATION 

    Ignition on, engine not running.

    With a scan tool, actuate the High Speed Radiator Fan Relay.

    Is the Cooling Fan Relay operating? 

    Yes 

    1. Refer to INTERMITTENT CONDITION .
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go To step  2).
  2. 2)  (A16) FUSED B+ CIRCUITS 

    Turn the ignition off.

    Remove the High Speed Radiator Fan Relay.

    Using a 12-volt test light connected to ground, probe the (A16) Fused B+ circuits in the Relay connection.

    Is the voltage above 11.0 volts? 

    Yes 

    1. Go To step  3).

    No 

    1. Repair the open or short to ground in the (A16) Fused B+ circuits. Inspect the related fuse and repair as necessary.
    2. Perform BODY VERIFICATION TEST - VER 1 .
  3. 3)  HIGH SPEED RADIATOR FAN RELAY RESISTANCE 

    Measure the resistance of the High Speed Radiator Fan Relay Coil.

    Is the resistance between 60 to 80 ohms? 

    Yes 

    1. Go To step  4).

    No 

    1. Replace the Relay.
    2. Perform POWERTRAIN VERIFICATION TEST .
  4. 4)  (N112) COOLING FAN NO.2 CONTROL CIRCUIT OPEN 

    Disconnect the IPM FCM 49 way harness connector.

    Measure the resistance of the (N112) Cooling Fan No.2 Relay Control circuit from the Relay connection to the IPM FCM harness connector.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go To step  5).

    No 

    1. Repair the open in the (N112) Cooling Fan No.2 Relay Control circuit.
    2. Perform BODY VERIFICATION TEST - VER 1 .
  5. 5)  (N112) COOLING FAN NO.2 CONTROL CIRCUIT SHORTED TO GROUND 

    Measure the resistance between ground and the (N112) Cooling Fan No.2 Relay Control circuit at the Relay connection.

    Is the resistance below 100 ohms? 

    Yes 

    1. Repair the short to ground in the (N112) Cooling Fan No.2 Relay Control circuit.
    2. Perform BODY VERIFICATION TEST - VER 1 .

    No 

    1. Go To step  6).
  6. 6)  FRONT CONTROL MODULE 
    NOTE: Before continuing, check the FCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.

    Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.

    Were there any problems found? 

    Yes 

    1. Repair as necessary.
    2. Perform BODY VERIFICATION TEST - VER 1 .

    No 

    1. Replace the Front Control Module per Service Information.
    2. Perform BODY VERIFICATION TEST - VER 1 .
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