DTC Troubleshooting

DTC Troubleshooting: P0532, P0532

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 Initial Inspection and Diagnostic Overview.

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 0.24 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 to LOCK (0).

6. Disconnect the A/C pressure sensor 3P connector.

7. Turn the ignition switch to ON (II).

8. Check the A/C PRESSURE SENSOR in the DATA LIST with the HDS.

Is there about 0.24 V or less?

YES -

Go to step 10.

NO -

Go to step 9.

9. Measure the 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 to LOCK (0).

11. Jump the SCS line with the HDS.

12. Disconnect ECM/PCM connector A (49P).

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 (A17) and the A/C pressure sensor, then go to step 20.

NO -

Go to step 27.

14. Turn the ignition switch to LOCK (0).

15. Jump the SCS line with the HDS.

16. Disconnect ECM/PCM connector A (49P).

17. Check for continuity between A/C pressure sensor 3P connector terminal No. 1 and ECM/PCM connector terminal A20.





Is there continuity?

YES -

Go to step 27.

NO -

Repair open in the wire between the ECM/PCM (A20) and the A/C pressure sensor, then go to step 20.

18. Turn the ignition switch to LOCK (0).

19. Replace the A/C pressure sensor Service and Repair.

20. Reconnect all connectors.

21. Turn the ignition switch to ON (II).

22. Reset the ECM/PCM with the HDS.

23. Do the ECM/PCM idle learn procedure ECM/PCM Idle Learn Procedure (M/T), then let the engine idle.

24. Turn the blower switch on.

25. Turn the A/C switch on.

26. Check for Pending or Confirmed 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 Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.�

27. Reconnect all connectors.

28. Update the ECM/PCM if it does not have the latest software ECM/PCM Update (M/T), or substitute a known-good ECM/PCM.

29. Start the engine, and let it idle.

30. Turn the blower switch on.

31. Turn the A/C switch on.

32. Check for Pending or Confirmed 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 29. 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 Service and Repair. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.�