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Home >> Chrysler >> 2012 >> 300 C, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (3.6L - DTCS P0501 To P1128) >> Diagnosis And Testing >> P0645-A/C Clutch Relay Circuit >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different variant/trim than selected.
  1. DTC IS ACTIVE 
    NOTE:

    If there are any ASD/Main Relay or system voltage DTCs present, diagnose those DTCs before proceeding with this test procedure.

    1. Ignition on, engine not running.
    2. With the scan tool, select View DTCs. Copy DTC and Freeze Frame information and clear DTCs.
      NOTE:

      Active or pending DTCs may not allow A/C clutch actuation, make sure all DTCs are cleared before proceeding with this test procedure.

    3. With the scan tool, actuate the A/C Compressor.
    4. Monitor the scan tool for at least two minutes.
    5. With the scan tool, select View DTCs.

      Is the status Active for this DTC?

      Yes 

      • Go To  2.

      No 

  2. A/C CLUTCH RELAY 
    1. Turn the ignition off.
    2. Install a know good relay in place of the existing A/C Clutch Relay.
    3. Using a scan tool, erase the DTC.
    4. Start the engine and turn the A/C on.

      Does the DTC return?

      Yes 

      • Go To  3.

      No 

  3. (C13) A/C CLUTCH RELAY CONTROL CIRCUIT SHORTED TO GROUND 
    Fig 1: Checking A/C Clutch Relay Control Circuit For Short To Ground
    GC0150184Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off.
    2. Disconnect the PCM C1 harness connector.
    3. Measure the resistance between ground and the (C13) A/C Clutch Relay Control circuit in the PCM C1 harness connector.

      Is the resistance below 100 Ohms?

      Yes 

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

      No 

      • Go To  4.
  4. (C13) A/C CLUTCH CONTROL CIRCUIT OPEN OR HIGH RESISTANCE BETWEEN THE PCM AND RELAY 
    1. Measure the resistance of the (C13) A/C Clutch Control circuit between PCM C1 harness connector and the A/C Clutch Control circuit terminal of the A/C Clutch Relay.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go To  5.

      No 

      • Replace the PDC for an open in accordance with the service information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  5. POWERTRAIN CONTROL MODULE (PCM) 
    1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Body Control Module (BCM) and the Powertrain Control Module (PCM).
    2. Look for any chafed, pierced, pinched or partially broken wires.
    3. Look for broken, bent, pushed out or corroded terminals. Verify that there is good pin to terminal contact in the related connectors.
    4. Perform any Technical Service Bulletins that may apply.

      Were any problems found?

      Yes 

      No 

      • Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .