DTC Troubleshooting

DTC Troubleshooting: P0533

DTC P0533:

A/C Pressure Sensor Circuit High 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 4.75 V or more?

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 to LOCK (0).

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

7. Connect A/C pressure sensor 3P connector terminals No. 2 and No. 3 with a jumper wire.





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

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

Is there about 4.75 V or more?

YES -

Go to step 10.

NO -

Go to step 22.

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

11. Remove the jumper wire from the A/C pressure sensor 3P connector.

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

13. 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 14.

NO -

Go to step 18.

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

15. Jump the SCS line with the HDS.

16. Disconnect PCM connector A (49P).

17. Check for continuity between A/C pressure sensor 3P connector terminal No. 2 and PCM connector terminal A45.





Is there continuity?

YES -

Go to step 32.

NO -

Repair open in the wire between the PCM(A45) and the A/C pressure sensor, then go to step 24.

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

19. Jump the SCS line with the HDS.

20. Disconnect PCM connector C (49P).

21. Check for continuity between A/C pressure sensor 3P connector terminal No. 3 and PCM connector terminal C15.





Is there continuity?

YES -

Go to step 32.

NO -

Repair open in the wire between the PCM(C15) and the A/C pressure sensor, then go to step 24.

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

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

24. Reconnect all connectors.

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

26. Reset the PCM with the HDS.

27. Do the PCM idle learn procedure PCM Idle Learn Procedure.

28. Start the engine, and let it idle.

29. Turn the blower switch on.

30. Turn the A/C switch on.

31. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P0533 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 Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.�

32. Reconnect all connectors.

33. Update the PCM if it does not have the latest software PCM Update, or substitute a known-good PCM.

34. Start the engine, and let it idle.

35. Turn the blower switch on.

36. Turn the A/C switch on.

37. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P0533 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 34. 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 Service and Repair. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.�