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Home >> Chrysler >> 2006 >> PT Cruiser Base, 2D Convertible, Standard >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> 1.6L Engine - DTCS P0646 To P127C >> Diagnosis And Testing >> P0688-ASD Relay Output Circuit Low >> Diagnostic Test

Diagnostic Test

  1. 1)  VERIFY ASD DTC 
    NOTE: Diagnose P0686 or P0687 - Auto Shutdown Relay Control Circuit first if set along with this DTC.

    With the scan tool, erase the DTC.

    Attempt to start the engine. If the engine will not start, crank the engine for at least 15 seconds. It may be necessary to repeat several times.

    Does the DTC reset? 

    Yes 

    1. Go To  2).

    No 

    1. Refer to the INTERMITTENT CONDITION diagnostic procedure.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
  2. 2)  ASD RELAY 

    Turn the ignition off.

    Install a known good relay in place of the ASD Relay.

    Turn Ignition on.

    With the scan tool, erase DTCs.

    Attempt to start the engine.

    Does the engine start? 

    Yes 

    1. Replace the ASD Relay.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .

    No 

    1. Go To  3).
  3. 3)  (A14) FUSED B+ CIRCUIT 

    Turn the ignition off.

    Remove ASD Relay.

    Measure the voltage of the (A14) Fused B+ circuit.

    Is the voltage above 11.0 volts? 

    Yes 

    1. Go To  4).

    No 

    1. Repair the (A14) Fused B+ circuit. Check and replace any open fuses.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
  4. 4)  (K542) ASD RELAY OUTPUT CIRCUIT OPEN 

    Disconnect the PCM harness connector.

    Measure the resistance of the (K542) ASD Output circuit between the relay terminal and the TIPM C8 harness connector.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Go To  5).

    No 

    1. Repair the open in the (K542) ASD Relay Output circuit.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
  5. 5)  (K542) ASD RELAY OUTPUT CIRCUIT SHORT TO GROUND 

    Measure the resistance between ground and the (K542) ASD Output circuit.

    Is the resistance below 100 ohms? 

    Yes 

    1. Repair the short to ground in the (K542) ASD Relay Output circuit.

    No 

    1. Go To  6).
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
  6. 6)  PCM 
    NOTE: Before Continuing: Disconnect the PCM harness connector and check the related wiring 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.

    If there are no possible causes remaining, view repair. 

    Repair 

    1. Replace and program the Powertrain Control Module in accordance with the Service Information. (Refer to STANDARD PROCEDURE - PCM/ECM/SKREEM PROGRAMMING) .
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .
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