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Home >> Jeep >> 2007 >> Compass Limited, AWD, Standard >> Repair and Diagnosis >> Engine Performance >> System >> DTCS P0443 To P0562 >> P0533-A/C Pressure Sensor Circuit High >> Diagnostic Test

Diagnostic Test

  1. 1) DTC IS ACTIVE 
    NOTE: Diagnose and repair any system voltage or sensor reference voltage DTCs before continuing with this test.

    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 personal injury or death.

    With the scan tool, select View DTCs.

    Is the status Active for this DTC? 

    Yes 

    1. Go To  2).

    No 

    1. Refer to the *CHECKING FOR AN INTERMITTENT CONDITION Diagnostic Procedure.
  2. 2) (C818) A/C PRESSURE SENSOR SUPPLY CIRCUIT SHORTED TO VOLTAGE 
    Fig 1: Measuring Voltage Of (C818) A/C Pressure Sensor Supply Circuit In A/C Pressure Transducer Harness Connector
    GC0054130Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Disconnect the A/C Pressure Transducer connector.

    Disconnect the Totally Integrated Power Module (TIPM) connector.

    Turn the ignition on.

    Measure the voltage of the (C818) A/C Pressure Sensor Supply circuit in the A/C Pressure Transducer harness connector.

    Is there any voltage present? 

    Yes 

    1. Repair the (C818) A/C Pressure Sensor Supply circuit for a short to voltage.
    2. Perform PCM VERIFICATION TEST .

    No 

    1. Go to  3).
  3. 3) (C18) A/C PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE 
    Fig 2: Measuring Voltage Of (C18) A/C Pressure Sensor Signal Circuit In The A/C Pressure Transducer Harness Connector
    GC0054131Courtesy of CHRYSLER LLC

    Measure the voltage of the (C18) A/C Pressure Sensor Signal circuit in the A/C Pressure Transducer harness connector.

    Is there any voltage present? 

    Yes 

    1. Repair the (C18) A/C Pressure Sensor Signal circuit for a short to voltage.
    2. Perform PCM VERIFICATION TEST .

    No 

    1. Go to  4).
  4. 4) (C18) A/C PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO THE (C818) A/C PRESSURE SENSOR SUPPLY CIRCUIT 
    Fig 3: Checking A/C Pressure Sensor Signal Circuit For Short To A/C Pressure Sensor Supply Circuit
    GC0054132Courtesy of CHRYSLER LLC

    Measure the resistance between the (C18) A/C Pressure Sensor Signal circuit and the (C818) A/C Pressure Sensor Supply circuit in the A/C Pressure Transducer harness connector.

    Is the resistance below 100 ohms? 

    Yes 

    1. Repair the (C18) A/C Pressure Sensor Signal circuit for a short to the (C818) A/C Pressure Sensor Supply circuit.
    2. Perform PCM VERIFICATION TEST .

    No 

    1. Go to  5).
  5. 5) (C18) A/C PRESSURE SENSOR SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE 
    Fig 4: Checking A/C Pressure Sensor Signal Circuit For Open Or High Resistance
    GC0054133Courtesy of CHRYSLER LLC

    Turn the ignition off.

    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 

    1. Go to  6).

    No 

    1. Repair the (C18) A/C Pressure Sensor Signal circuit for an open circuit or high resistance.
    2. Perform PCM VERIFICATION TEST .
  6. 6) (C918) A/C PRESSURE SENSOR GROUND CIRCUIT OPEN OR HIGH RESISTANCE 
    Fig 5: Checking A/C Pressure Sensor Ground Circuit For Open Or High Resistance
    GC0054134Courtesy of CHRYSLER LLC

    Measure the resistance of the (C918) A/C Pressure Sensor Ground 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 

    1. Go to  7).

    No 

    1. Repair the (C918) A/C Pressure Sensor Ground circuit for an open circuit or high resistance.
    2. Perform PCM VERIFICATION TEST .
  7. 7) A/C PRESSURE TRANSDUCER 
    Fig 6: Connecting Jumper Wire Between A/C Pressure Sensor Ground Circuit And Signal Circuit In A/C Pressure Transducer Harness Connector
    GC0054135Courtesy of CHRYSLER LLC

    Turn the ignition off.

    Connect the Totally Integrated Power Module (TIPM) connector.

    Connect a jumper wire between the (C918) A/C Pressure Sensor Ground circuit and the (C18) A/C Pressure Sensor Signal circuit in the A/C Pressure Transducer harness connector.

    Turn the ignition on.

    With the scan tool, read the A/C Pressure Transducer signal voltage.

    Is the voltage below 1.0 volt with the jumper wire in place? 

    Yes 

    1. Replace the A/C Pressure Transducer in accordance with the Service Information.
    2. Perform PCM VERIFICATION TEST .

    No 

    1. Go to  8).
  8. 8) TOTALLY INTEGRATED POWER MODULE (TIPM) 

    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).

    Look for any chafed, pierced, pinched, or partially broken wires.

    Look for broken, bent, pushed out or corroded terminals.

    Refer to any Technical Service Bulletins that may apply.

    Were any problems found? 

    Yes 

    1. Repair as necessary.
    2. Perform PCM VERIFICATION TEST .

    No 

    1. Replace and program the Totally Integrated Power Module (TIPM) in accordance with the Service Information.
    2. Perform PCM VERIFICATION TEST .
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