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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)  A/C CLUTCH RELAY OPERATION 

    Ignition on, engine not running.

    With a scan tool, actuate the A/C Clutch Relay.

    Is the A/C Clutch Relay operating? 

    Yes 

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

    No 

    1. Go To step  2).
  2. 2)  A/C CLUTCH RELAY RESISTANCE 

    Turn the ignition off.

    Remove the A/C Clutch Relay from the IPM.

    Measure the resistance of the A/C Clutch Relay Coil.

    Is the resistance between 60 to 80 ohms? 

    Yes 

    1. Go To step  3).

    No 

    1. Replace the A/C Clutch Relay.
    2. Perform POWERTRAIN VERIFICATION TEST .
  3. 3)  (F942) FUSED IGNITION SWITCH OUTPUT CIRCUIT 

    Ignition on, engine not running.

    Using a 12-volt test light connected to ground, probe the (F942) Fused Ignition Switch Output circuit in the connection.

    Does the test light illuminate brightly? 

    Yes 

    1. Go To step  4).

    No 

    1. Repair the open or short to ground in the (F942) Fused Ignition Switch Output circuit. Check and replace any open fuses.
    2. Perform POWERTRAIN VERIFICATION TEST .
  4. 4)  (A917) FUSED B+ CIRCUIT 

    Using a 12-volt test light connected to ground, probe the (A917) Fused B+ circuit in the connection.

    Does the test light illuminate brightly? 

    Yes 

    1. Go To step  5).

    No 

    1. Repair the open or short to ground in the (A917) Fused B+ circuit. Check and replace any open fuses.
    2. Perform POWERTRAIN VERIFICATION TEST .
  5. 5)  (C13) A/C CLUTCH RELAY CONTROL CIRCUIT OPEN 

    Turn the ignition off.

    Disconnect the C3 PCM harness connector.

    CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.

    Measure the resistance of the (C13) A/C Clutch Relay Control circuit from the relay connection to the appropriate terminal of special tool #8815.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go To step  6).

    No 

    1. Repair the open in the (C13) A/C Clutch Relay Control circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .
  6. 6)  (C13) A/C CLUTCH RELAY CONTROL CIRCUIT SHORTED TO GROUND 

    Measure the resistance between ground and the (C13) A/C Clutch Relay Control circuit at the IPM.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Repair the short to ground in the (C13) A/C Relay Clutch Control circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go To step  7).
  7. 7)  PCM 
    NOTE: Before continuing, check the PCM 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 POWERTRAIN VERIFICATION TEST .

    No 

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