DTC Troubleshooting

DTC P0532: A/C Pressure Sensor Circuit Low Voltage

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.

1. Start the engine, and let it idle.
2. Turn the blower switch on.
3. Turn the A/C switch on.
4. Check the A/C PRESSURE SENSOR in the DATA LIST with the HDS.

Is there about 0.3 V or less?

YES - Go to step 5.

NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the A/C pressure sensor and the ECM/PCM.

5. Turn the ignition switch OFF.
6. Disconnect the A/C pressure sensor 3P connector.
7. Turn the ignition switch ON (II).
8. Check the A/C PRESSURE SENSOR in the DATA LIST with the HDS.

Is there about 0.3 V or less?

YES - Go to step 10.

NO - Go to step 9.

9. Measure voltage between A/C pressure sensor 3P connector terminals No. 1 and No. 3.






Is there about 5 V?

YES - Go to step 18.

NO - Go to step 14.

10. Turn the ignition switch OFF.
11. Jump the SCS line with the HDS.
12. Disconnect ECM/PCM connector A (44P).
13. Check for continuity between A/C pressure sensor 3P connector terminal No. 2 and body ground.






Is there continuity?

YES - Repair short in the wire between the ECM/PCM (A16) and the A/C pressure sensor, then go to step 20.

NO - Go to step 28.

14. Turn the ignition switch OFF.
15. Jump the SCS line with the HDS.
16. Disconnect ECM/PCM connector A (44P).
17. Check for continuity between A/C pressure sensor 3P connector terminal No. 1 and ECM/PCM connector terminal A19.






Is there continuity?

YES - Go to step 28.

NO - Repair open in the wire between the ECM/PCM (A19) and the A/C pressure sensor, then go to step 20.

18. Turn the ignition switch OFF.
19. Replace the A/C pressure sensor.
20. Reconnect all connectors.
21. Turn the ignition switch ON (II).
22. Reset the ECM/PCM with the HDS.
23. Do the ECM/PCM idle learn procedure.
24. Start the engine, and let it idle.
25. Turn the blower switch on.
26. Turn the A/C switch on.
27. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0532 indicated?

YES - Check for poor connections or loose terminals at the A/C pressure sensor and the ECM/PCM, then go to step 1.

NO - Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.

28. Reconnect all connectors.
29. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM.
30. Start the engine, and let it idle.
31. Turn the blower switch on.
32. Turn the A/C switch on.
33. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0532 indicated?

YES - Check for poor connections or loose terminals at the A/C pressure sensor and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM, then go to step 30. If the ECM/PCM was substituted, go to step 1.

NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.