| DTC P0533: | A/C pressure sensor Circuit High Voltage |
| 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 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.n |
| 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.
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| 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 10. NO - Go to 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 terminals No. 1 and No. 3.
Is there about 5 V? YES - Go to 14. NO - Go to 18. |
| 14. | Turn the ignition switch OFF, and wait 1 minute. |
| 15. | Disconnect ECM connector No. 1 (96P). |
| 16. | Connect A/C pressure sensor 3P connector terminal No. 2 to body ground with a jumper wire.
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| 17. | Check for continuity between ECM connector No. 1 terminal No. 18 and body ground.
Is there continuity? YES - Go to 31. NO - Repair open in the wire between the A/C pressure sensor and ECM connector No. 1 terminal No. 18, then go to 24 |
| 18. | Turn the ignition switch OFF, and wait 1 minute. |
| 19. | Disconnect ECM connector No. 1 (96P). |
| 20. | Connect A/C pressure sensor 3P connector terminal No. 3 to body ground with a jumper wire.
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| 21. | Check for continuity between ECM connector No. 1 terminal No. 10 and body ground.
Is there continuity? YES - Go to 31. NO - Repair open in the wire between the A/C pressure sensor and ECM connector No. 1 terminal No. 10, then go to 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 with the HDS. |
| 27. | Start the engine, and let it idle. |
| 28. | Turn the blower switch on. |
| 29. | Turn the A/C switch on. |
| 30. | 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, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - Troubleshooting is complete.n |
| 31. | Update the ECM if it does not have the latest software, or substitute a known-good ECM. |
| 32. | Start the engine, and let it idle. |
| 33. | Turn the blower switch on. |
| 34. | Turn the A/C switch on. |
| 35. | Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0532 is indicated, check for poor connections or loose terminals at the A/C pressure sensor and the ECM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM was updated, troubleshooting is complete. If the ECM was substituted, replace the original ECM. |