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Home >> Chrysler >> 2011 >> 300 Base, Gas >> Repair and Diagnosis >> External Pages >> Different car >> Section 98 (6.7L Diesel - DTCS - P040D To P1191 - 3500 Cab & Chassis) >> Diagnosis and Testing >> P0646-A/C Control Circuit Low >> Testing >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2011 RAM Cab & Chassis. 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 
    Fig 1: Checking A/C Compressor Clutch Control Circuit For An Open Or High Resistance
    GC0148754Courtesy of CHRYSLER LLC
    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 
    Fig 2: Checking A/C Compressor Clutch Circuit For A Short To Ground
    GC0148753Courtesy of CHRYSLER LLC
    1. 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 
    Fig 3: Checking PCM/TIPM Control Circuits
    GC0148751Courtesy of CHRYSLER LLC
    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 (PCM) in accordance with the service information.
      • Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Refer to POWERTRAIN VERIFICATION TEST - 6.7L .
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