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DTC P0532: A/C Pressure Sensor Low: Testing

  1. Ensure the A/C refrigerant system is properly charged. Start the engine. With the DRBIII® scan tool, read the A/C pressure sensor voltage. Is the voltage below 0.6 of a volt? If yes, go to next step. If no, see INTERMITTENT CONDITION  under SELF-DIAGNOSTIC SYSTEM.
  2. Turn the ignition off. Disconnect the A/C pressure sensor harness connector. Turn the ignition on. Measure the voltage of the (K7) 5-volt supply circuit in the A/C pressure sensor harness connector. Is the voltage between 4.5 to 5.2 volts? If yes, go to next step. If no, go to step  7.
  3. Turn the ignition off. Disconnect the A/C pressure sensor harness connector. With the DRBIII® scan tool, monitor the A/C pressure sensor voltage. Turn the ignition on. Is the voltage above 0.6 of a volt? If yes, replace the A/C pressure sensor. If no, go to next step.
  4. Turn the ignition off. Disconnect the A/C pressure sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance between ground and the (C18) A/C pressure signal circuit in the A/C pressure sensor harness connector. Is the resistance below 100 ohms? If yes, repair the short to ground in the (C18) A/C pressure signal circuit. If no, go to next step.
  5. Turn the ignition off. Disconnect the A/C pressure sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance between the (C18) A/C pressure sensor signal circuit and the (K4) sensor ground circuit in the A/C pressure sensor harness connector. Is the resistance below 100 ohms? If yes, repair the short to the (K4) sensor ground circuit in the (C18) A/C pressure signal circuit. If no, go to next step.
  6. Before continuing disconnect the PCM harness connector and check the related wiring terminals for corrosion, damage or terminal push out. Repair as necessary. Pay particular attention to all power and ground circuits. If there are no possible causes remaining, replace and program the PCM. See PROGRAMMING .
  7. Turn the ignition off. Disconnect the A/C pressure sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance between ground and the (K7) 5-volt supply circuit in the A/C pressure sensor harness connector. Is the resistance below 100 ohms? If yes, repair the short to ground in the (K7) 5-volt supply circuit. If no, go to next step.
    8. CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool (8815) to perform diagnosis.
  8. Turn the ignition off. Disconnect the A/C pressure sensor harness connector. Disconnect the PCM harness connectors. Measure the resistance of the (K7) 5-volt supply circuit from the A/C pressure sensor harness connector to the appropriate terminal of Miller Special Tool (8815). Is the resistance below 5.0 ohms? If yes, go to next step. If no, repair the open in the (K7) 5-volt supply circuit.
  9. Before continuing disconnect the PCM harness connector and check the related wiring terminals for corrosion, damage or terminal push out. Repair as necessary. Pay particular attention to all power and ground circuits. If there are no possible causes remaining, replace and program the PCM. See PROGRAMMING .
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