P0532 A/C Pressure sensor circuit low

P0532 Code - when monitored the engine running, A/C is learned and A/C clutch relay energized. Set condition, the A/C pressure sensor signal voltage received by the PCM from the TIPM is below the minimum acceptable value. Default action MIL light illuminate.

Possible causes P0532 Code

• A/C pressure sensor supply circuit short to ground.
• A/C pressure sensor signal circuit shorted to ground.
• A/C pressure sensor supply circuit shorted to the A/C pressure sensor ground circuit.
• A/C pressure sensor signal circuit shorted to the A/C pressure sensor ground circuit.
• A/C pressure sensor supply circuit open/high resistance.
• A/C pressure sensor signal circuit open/high resistance.
• A/C pressure transducer.
• Totally Intergrated Power Module 

Diagnose P0532 Code

Step 1. Check for an active DTC

Note: - Diagnose and repair any CAN Bus, communication or implausible signal DTCs before proceeding with this test. Diagnose and repair any system voltage or sensor supply voltage DTCs before continuing with this test. Make sure the A/C refrigerant is properly charged in accordance with spesification.

Test drive or operate the vehicle in accordance with the when monitored and set conditions. With the scan tool, read DTCs.

Is the DTC active or pending?

Yes, go to step 2.

No, perform the PCM intermittent condition.

Step 2. Check the A/C pressure sensor supply circuit voltage

Turn the ignition off, disconnect the A/C transducer harness connector. Turn the ignition on, measure the voltage on the A/C pressure supply circuit at the A/C pressure Transducer harness connector.

Is the voltage above 4.9 volts?

Yes, go to step 3.

No, repair the A/C pressure sensor supply circuit for an open circuit or short to ground.

Step 3. Check the A/C pressure sensor signal circuit for a short to ground

Turn the ignition off, disconnect the TIPM harness connector. Check for continuity between ground and the A/C pressure sensor signal circuit at the A/C pressure Transducer harness connector.

Is there continuity between ground and the A/C pressure sensor signal circuit?

Yes, repair the A/C pressure sensor signal circuit a short to ground.

No, go to step 4.

Step 4. Check for the A/C pressure sensor signal circuit shorted to the A/C pressure sensor ground circuit

Check for continuity between the A/C pressure sensor signal circuit and the A/C pressure sensor ground circuit at the A/C pressure Transducer harness connector.

Is there continuity between the A/C pressure sensor signal circuit and the A/C pressure sensor ground circuit?

Yes, repair the A/C pressure sensor signal circuit for a short to the A/C pressure sensor ground circuit.

No, go to step 5.

Step 5. Check the A/C pressure sensor signal circuit for an open/high resistance

Measure the resistance of the A/C pressure sensor signal circuit between the A/C pressure Transducer harness connector and the TIPM harness connector.

Is the resistance below 3.0 Ohms?

Yes,  go to step 6.

No, repair the A/C pressure sensor signal circuit for an open or high resistance.

Step 6. A/C pressure Transducer

Turn the ignition off, reconnect the TIPM harness connector. Connect a jumper between the A/C pressure sensor supply circuit and the A/C pressure sensor signal circuit at 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 above 4.9 volts with the jumper in place?

Yes, replace the A/C pressure Transducer.

No, go to step 7.

Step 7. Check related PCM and component connections

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