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.

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, 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. Connect A/C pressure sensor 3P connector terminals No. 2 and No. 3 with a jumper wire.
8. Turn the ignition switch 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 OFF.
11. Remove the jumper wire from the A/C pressure sensor 3P connector.
12. Turn the ignition switch ON (II).




13. Measure voltage between A/C pressure sensor 3P connector terminal 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 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. 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 OFF.
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 OFF.
23. Replace the A/C pressure sensor.
24. Reconnect all connectors.
25. Turn the ignition switch ON (II).
26. Reset the ECM/PCM with the HDS.
27. Do the ECM/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 Temporary DTCs or DTCs with the HDS.

Are any Temporary DTCs or DTCs indicated?

Yes - If DTC P0533 is indicated, check for poor connections or loose terminals at the A/C pressure sensor and the ECM/PCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

NO - Troubleshooting is complete.

32. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM.
33. Start the engine, and let it idle.
34. Turn the blower switch on.
35. Turn the A/C switch on.
36. 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, then go to step 33. 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 DTC's troubleshooting.