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Home >> Jeep >> 2014 >> Wrangler Sahara, Standard Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 248 (3.6L - DTCS P0461 To P0652) >> DTC Troubleshooting >> P0533-A/C Pressure Sensor Circuit High >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different car, the 2016 Jeep Wrangler and 2015 Jeep Wrangler. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK FOR AN 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. Test drive or operate the vehicle in accordance with the when monitored and set conditions.
      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, read DTCs and record on the repair order.

      Is the DTC active or pending?

      Yes 

      • Go To  2

      No 

  2. CHECK THE (C818) A/C PRESSURE SENSOR SUPPLY CIRCUIT FOR A SHORT TO VOLTAGE 
    1. Turn the ignition off.
    2. Disconnect the A/C Pressure Sensor connector.
    3. Disconnect the TIPM C1 harness connector.
    4. Turn the ignition on.
    5. Measure the voltage on the (C818) A/C Pressure Sensor Supply circuit at the A/C Pressure Sensor harness connector.

      Is the voltage above 5.2 volts?

      Yes 

      • Repair the (C818) A/C Pressure Sensor Supply circuit for a short to voltage.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  3
  3. CHECK THE (C18) A/C PRESSURE SENSOR SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE 
    1. Measure the voltage on the (C18) A/C Pressure Sensor Signal circuit at the A/C Pressure Sensor harness connector.

      Is the voltage above 5.2 volts?

      Yes 

      • Repair the (C18) A/C Pressure Sensor Signal circuit for a short to voltage.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  4
  4. (C18) A/C PRESSURE SENSOR SIGNAL CIRCUIT SHORTED TO THE (C818) A/C PRESSURE SENSOR SUPPLY CIRCUIT 
    1. Check for continuity between the (C18) A/C Pressure Sensor Signal circuit and the (C818) A/C Pressure Sensor Supply circuit at the A/C Pressure Sensor harness connector.

      Is there continuity between the (C18) A/C Pressure Sensor Signal circuit and the (C818) A/C Pressure Sensor Supply circuit?

      Yes 

      • Repair the (C18) A/C Pressure Sensor Signal circuit for a short to the (C818) A/C Pressure Sensor Supply circuit.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  5
  5. CHECK THE (C18) A/C PRESSURE SENSOR SIGNAL CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Turn the ignition off.
    2. Measure the resistance of the (C18) A/C Pressure Sensor Signal circuit between the A/C Pressure Sensor harness connector and the TIPM C1 harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  6

      No 

      • Repair the (C18) A/C Pressure Sensor Signal circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  6. CHECK THE (C918) A/C PRESSURE SENSOR GROUND CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. Measure the resistance of the (C918) A/C Pressure Sensor Ground circuit between the A/C Pressure Sensor harness connector and the Totally Integrated Power Module (TIPM) harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  7

      No 

      • Repair the (C918) A/C Pressure Sensor Ground circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  7. A/C PRESSURE TRANSDUCER 
    1. Turn the ignition off.
    2. Reconnect the TIPM C1 harness connector.
    3. Connect a jumper between the (C918) A/C Pressure Sensor Ground circuit and the (C18) A/C Pressure Sensor Signal circuit at the A/C Pressure Sensor harness connector.
    4. Turn the ignition on.
    5. With the scan tool, read the A/C Pressure Sensor signal voltage.

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

      Yes 

      No 

      • Go To  8
  8. CHECK RELATED PCM AND COMPONENT CONNECTIONS 
    1. Perform any Service Bulletins that apply.
    2. Disconnect all TIPM harness connectors.
    3. Disconnect all related in-line harness connections (if equipped).
    4. Disconnect the related component harness connectors.
    5. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
      • Proper connector installation.
      • Damaged connector locks.
      • Corrosion.
      • Other signs of water intrusion.
      • Weather seal damage (if equipped).
      • Bent terminals.
      • Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
      • Terminals that have been pushed back into the connector cavity.
      • Check for spread terminals and verify proper terminal tension.

      Repair any conditions that are found.

    6. Reconnect all TIPM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
    7. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
    8. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
    9. With the scan tool, erase DTCs.
    10. Test drive or operate the vehicle in accordance with the when monitored and set conditions.
    11. With the scan tool, read DTCs.

      Did the DTC return?

      Yes 

      No 

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