LEMON Manuals: Even more car manuals for everyone
Home >> Jeep >> 2005 >> Wrangler Rubicon, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 552 (DTCS P0642 To P1593) >> Diagnosis And Testing >> P0685-Auto Shutdown Relay Control Circuit >> Diagnostic Test

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)  ASD RELAY OPERATION 

    Ignition on, engine not running.

    With a scan tool, actuate the ASD Relay.

    Is the ASD Relay operating? 

    Yes 

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

    No 

    1. Go To step  2).
  2. 2)  (A924) FUSED B+ CIRCUITS 

    Turn the ignition off.

    Remove the ASD Relay from the IPM.

    Using a 12-volt test light connected to ground, probe the (A924) Fused B+ circuits in the IPM.

    Does the test light illuminate brightly? 

    Yes 

    1. Go To step  3).

    No 

    1. Repair the open or short to ground in the (A924) Fused B+ circuits. Inspect and replace any open fuses.
    2. Perform POWERTRAIN VERIFICATION TEST .
  3. 3)  ASD RELAY 

    Measure the resistance of the ASD Relay Coil.

    Is the resistance between 60 to 80 ohms? 

    Yes 

    1. Go To step  4).

    No 

    1. Replace the ASD Relay.
    2. Perform POWERTRAIN VERIFICATION TEST .
  4. 4)  (K342) ASD RELAY CONTROL CIRCUIT OPEN 

    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 (K342) ASD Relay Control circuit from the IPM to the appropriate terminals of special tool #8815.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go To step  5).

    No 

    1. Repair the open in the (K342) ASD Relay Control circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .
  5. 5)  (K342) ASD RELAY CONTROL CIRCUIT SHORTED TO GROUND 

    Measure the resistance between ground and the (K342) ASD Relay Control circuit in the IPM.

    Is the resistance below 100 ohms? 

    Yes 

    1. Repair the short to ground in the (K342) ASD Relay Control circuit.
    2. Perform POWERTRAIN VERIFICATION TEST .

    No 

    1. Go To step  6).
  6. 6)  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 .
scientia non olet · About LEMON Manuals