LEMON Manuals: Even more car manuals for everyone
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 >> P0646-A/C Clutch Relay Control Circuit Low >> Diagnostic Test

Diagnostic Test

  1. 1)  A/C Clutch OPERATION 

    Ignition on, engine not running.

    With a scan tool in the Powertrain Actuators, actuate the A/C Clutch.

    Is the A/C Clutch operating? 

    Yes 

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

    No 

    1. Go To  2).
  2. 2)  A/C CLUTCH CONTROL OPERATION FROM THE TIPM 
    Fig 1: CHECKING A/C CLUTCH CONTROL OPERATION FROM THE TIPM
    GC0041944Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the TIPM C1 harness connector.

    Turn the ignition on.

    Using the scan tool in the Powertrain Actuators, actuate the A/C Clutch.

    With a 12-volt test light connected to ground, probe the A/C Clutch Control circuit in the TIPM C1 harness connector.

    Does the test light illuminate brightly and flash on and off? 

    Yes 

      NOTE: Before continuing, check the TIPM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
    1. If OK, replace the TIPM in accordance with the Service Information.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .

    No 

    1. Go To  3).
  3. 3)  (C28) A/C CLUTCH CONTROL CIRCUIT SHORTED TO GROUND 
    Fig 2: CHECKING A/C CLUTCH CONTROL CIRCUIT SHORTED TO GROUND
    GC0041945Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Disconnect the PCM harness connector.

    Measure the resistance between ground and the (C28) A/C Clutch Control circuit in the TIPM C1 harness connector and the PCM harness connector.

    Is the resistance below 100 ohms? 

    Yes 

    1. Repair the short to ground in the (C28) A/C Clutch Control circuit.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .

    No 

    1. Go To  4).
  4. 4)  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 the POWERTRAIN VERIFICATION TEST. (Refer to STANDARD PROCEDURE - POWERTRAIN VERIFICATION TEST) .

    No 

    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) .
scientia non olet · About LEMON Manuals