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 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 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 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 PCM connector A (44P).




17. Check for continuity between A/C pressure sensor 3P connector terminal No. 1 and PCM connector terminal A19.

Is there continuity?

YES - Go to step 28.

NO - Repair open in the wire between the 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 PCM with the HDS.
23. Do the 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 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 PCM if it does not have the latest software, or substitute a known-good 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 PCM. If the PCM was updated, substitute a known-good PCM, then go to step 30. If the PCM was substituted, go to step 1.

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