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Home >> Chrysler >> 2011 >> 300 C, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 196 (3.7L/4.7L/5.7L - DTCS P0506 To P0850 - NGC - 1500 & 2500) >> Diagnosis And Testing >> P0532-A/C Pressure Sensor Circuit Low >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2012 RAM Pickup. However, it is still accessible from the selected car via links, so may be relevant.
  1. ACTIVE DTC 
    NOTE:

    Diagnose and repair any CAN bus, communication or implausible signal DTCs before proceeding with this test.

    NOTE:

    Diagnose and repair any system voltage or sensor supply voltage DTCs before continuing with this test.

    NOTE:

    Make sure the A/C refrigerant System is properly charged in accordance with the Service Information. Refer to SPECIFICATIONS .

    1. Start the engine and allow it to reach normal operating temperature.
      WARNING:

      When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in possible serious or fatal injury.

    2. With the scan tool, select View DTCs.

      Is the DTC Active at this time?

      Yes 

      • Go To  2.

      No 

  2. (C818) A/C PRESSURE SENSOR SUPPLY CIRCUIT VOLTAGE 
    Fig 1: Measuring Voltage Of A/C Pressure Sensor Supply Circuit In A/C Pressure Transducer Harness Connector
    GC0099948Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off.
    2. Disconnect the A/C Pressure Transducer connector.
    3. Turn the ignition on.
    4. Measure the voltage of the (C818) A/C Pressure Sensor Supply circuit in the A/C Pressure Transducer harness connector.

      Is the voltage above 4.5 Volts?

      Yes 

      • Go To  6.

      No 

      • Go To  3.
  3. (C818) A/C PRESSURE SENSOR SUPPLY CIRCUIT SHORTED TO GROUND 
    Fig 2: Measuring Resistance Between Ground & A/C Pressure Sensor Supply Circuit In A/C Pressure Transducer Harness Connector
    GC0099949Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition on.
    2. Disconnect the Totally Integrated Power Module (TIPM) harness connector.
    3. Measure the resistance between ground and the (C818) A/C Pressure Sensor Supply circuit in the A/C Pressure Transducer harness connector.

      Is the resistance above 1000 Ohms?

      Yes 

      • Go To  4.

      No 

      • Repair the (C818) A/C Pressure Sensor Supply circuit for a short to ground.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  4. (C818) A/C PRESSURE SENSOR SUPPLY CIRCUIT SHORTED TO THE (C918) A/C PRESSURE SENSOR GROUND CIRCUIT 
    Fig 3: Measuring Resistance Between A/C Pressure Sensor Supply Circuit & Ground Circuit In A/C Pressure Transducer Harness Connector
    GC0099950Courtesy of CHRYSLER GROUP, LLC
    1. Measure the resistance between the (C818) A/C Pressure Sensor Supply circuit and the (C918) A/C Pressure Sensor Ground circuit in the A/C Pressure Transducer harness connector.

      Is the resistance above 100 Ohms?

      Yes 

      • Go To  5.

      No 

      • Repair the (C818) A/C Pressure Sensor Supply circuit for a short to the (C918) A/C Pressure Sensor Ground circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  5. (C818) A/C PRESSURE SENSOR SUPPLY CIRCUIT OPEN OR HIGH RESISTANCE 
    Fig 4: Checking A/C Pressure Sensor Supply Circuit For Open Or High Resistance
    GC0129835Courtesy of CHRYSLER GROUP, LLC
    1. Measure the resistance of the (C818) A/C Pressure Sensor Supply circuit between the A/C Pressure Transducer harness connector and the Totally Integrated Power Module (TIPM) harness connector.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go To  10.

      No 

      • Repair the (C818) A/C Pressure Sensor Supply circuit for an open circuit or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  6. (C18) A/C PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO GROUND 
    Fig 5: Measuring Resistance Between Ground & A/C Pressure Sensor Signal Circuit In A/C Pressure Transducer Harness Connector
    GC0099952Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off.
    2. Disconnect the Totally Integrated Power Module (TIPM) C1 harness connector.
    3. Measure the resistance between ground and the (C18) A/C Pressure Sensor Signal circuit in the A/C Pressure Transducer harness connector.

      Is the resistance above 100 Ohms?

      Yes 

      • Go To  7.

      No 

      • Repair the (C18) A/C Pressure Sensor Signal circuit for a short to ground.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  7. (C18) A/C PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO THE (C918) A/C PRESSURE SENSOR GROUND CIRCUIT 
    Fig 6: Measuring Resistance Between A/C Pressure Sensor Signal Circuit & Ground Circuit In A/C Pressure Transducer Harness Connector
    GC0099953Courtesy of CHRYSLER GROUP, LLC
    1. Measure the resistance between the (C18) A/C Pressure Sensor Signal circuit and the (C918) A/C Pressure Sensor Ground circuit in the A/C Pressure Transducer harness connector.

      Is the resistance above 100 Ohms?

      Yes 

      • Go To  8.

      No 

      • Repair the (C18) A/C Pressure Sensor Signal circuit for a short to the (C918) A/C Pressure Sensor Ground circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  8. (C18) A/C PRESSURE SENSOR SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE 
    Fig 7: Checking A/C Pressure Sensor Signal Circuit For Open Or High Resistance
    GC0129836Courtesy of CHRYSLER GROUP, LLC
    1. Measure the resistance of the (C18) A/C Pressure Sensor Signal circuit between the A/C Pressure Transducer harness connector and the Totally Integrated Power Module (TIPM) harness connector.

      Is the resistance below 5.0 Ohms?

      Yes 

      • Go To  9.

      No 

      • Repair the (C18) A/C Pressure Sensor Signal circuit for an open circuit or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  9. AC PRESSURE TRANSDUCER 
    Fig 8: Identifying A/C Pressure Transducer Harness Connector Terminals
    GC0099955Courtesy of CHRYSLER GROUP, LLC
    1. Turn the ignition off.
    2. Connect the Totally Integrated Power Module (TIPM) C1 harness connector.
    3. Connect a jumper wire between the (C818) A/C Pressure Sensor Supply circuit and the (C18) A/C Pressure Sensor Signal circuit in the A/C Pressure Transducer harness connector.
    4. Turn the ignition on.
    5. With the scan tool, read the AC Pressure Transducer signal voltage.

      Is the voltage above 4.5 Volts with the jumper wire in place?

      Yes 

      • Replace the A/C Pressure Transducer in accordance with the Service Information.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  10.
  10. TOTALLY INTEGRATED POWER MODULE (TIPM) 
    1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the A/C Pressure Transducer and the Totally Integrated Power Module (TIPM).
    2. Look for any chafed, pierced, pinched or partially broken wires.
    3. Look for broken, bent, pushed out or corroded terminals.
    4. Perform any Technical Service Bulletins that may apply.

      Were any problems found?

      Yes 

      No 

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