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 ECM/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 ECM/PCM connector A (44P).

17. Check for continuity between A/C pressure sensor 3P connector terminal No. 2 and ECM/PCM connector terminal A16.

Is there continuity?
YES - Go to step 32.

NO - Repair open in the wire between the ECM/PCM (A16) 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 ECM/PCM connector A (44P).

21. Check for continuity between A/C pressure sensor 3P connector terminal No. 3 and ECM/PCM connector terminal A9.

Is there continuity?
YES - Go to step 32.

NO - Repair open in the wire between the ECM/PCM (A9) 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 ECM/PCM with the HDS.

27. Do the ECM/PCM idle learn procedure. ECM/PCM Idle Learn Procedure (A/T)

28. Start the engine, and let it idle.

29. Turn the blower switch on.

30. Turn the A/C switch on.

31. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0533 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 DTC's troubleshooting.


32. Reconnect all connectors.

33. Update the ECM/PCM if it does not have the latest software, ECM/PCM Update (A/T) or substitute a known-good ECM/PCM. Initial Inspection and Diagnostic Overview

34. Start the engine, and let it idle.

35. Turn the blower switch on.

36. Turn the A/C switch on.

37. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0533 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, Initial Inspection and Diagnostic Overview then go to step 34. 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 Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.