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Home >> Chrysler >> 2011 >> 300 C, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 93 (6.7L Diesel - DTCS P0402 To P1CEF - 2500 & 3500) >> Diagnosis and Testing >> P0646-A/C Control Circuit Low >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2011 RAM Pickup. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK THE (C13) A/C COMPRESSOR CLUTCH CONTROL CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Turn the ignition off.
    2. Disconnect the PCM C2 harness connector.
    3. Disconnect the TIPM C1 harness connector.
      NOTE:

      Check connectors - Clean/repair as necessary.

    4. Measure the resistance of the (C13) A/C Compressor Clutch Control circuit between the PCM C2 and TIPM C1 harness connectors.

      Is the resistance below 5.0 Ohms?

      No 

      • Repair the (C13) A/C Compressor Clutch Control circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .

      Yes 

      • Go To  2.
  2. CHECK THE (C13) A/C COMPRESSOR CLUTCH CIRCUIT FOR A SHORT TO GROUND 
    1. Ignition off.
    2. Measure the resistance between ground and the (C13) A/C Compressor Clutch Control circuit at the TIPM C1 harness connector.

      Is the resistance below 10k Ohms?

      Yes 

      • Go To  3.

      No 

      • Repair the (C13) A/C Compressor Clutch Control circuit for a short to ground.
      • Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
  3. CHECK THE PCM/TIPM 
    1. Reconnect the PCM C2 harness connector.
    2. Ignition on, engine not running.
    3. Using a 12-Volt test light connected to battery positive, probe the (C13) A/C Clutch Control circuit at the TIPM C1 harness connector while actuating the A/C Compressor Clutch circuit with the scan tool.
      NOTE:

      The test light must illuminate brightly.

    4. Compare the brightness to that of a direct connection to the Battery.

      Does the test light illuminate brightly?

      Yes 

      • Replace the Totally Integrated Power Module (TIPM) in accordance with the Service Information.
      • Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .

      No 

      • Replace the Powertrain Control Module in accordance with the Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
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