| DTC P0123: | TP Sensor A Circuit High Voltage |
| 1. | Turn the ignition switch ON (II). |
| 2. | Clear the DTC with the HDS. |
| 3. | Check TP SENSOR A in the DATA LIST with the HDS. Is there about 4.8 V or more? YES - Go to 4. NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the throttle body and the ECM/PCM.n |
| 4. | Check for Temporary DTCs or DTCs with the HDS. Are DTC P0123 and P0223 indicated at the same time? YES - Go to 13. NO - Go to 5. |
| 5. | Turn the ignition switch OFF. |
| 6. | Disconnect the throttle body 6P connector. |
| 7. | Turn the ignition switch ON (II). |
| 8. | Measure voltage between throttle body 6P connector terminal No. 1 and body ground.
Is there about 5 V? YES - Go to 18. NO - Go to 9. |
| 9. | Turn the ignition switch OFF. |
| 10. | Jump the SCS line with the HDS. |
| 11. | Disconnect ECM/PCM connector C (44P). |
| 12. | Check for continuity between ECM/PCM connector terminal C20 and throttle body 6P connector terminal No. 1.
Is there continuity? YES - Go to 25. NO - Repair open in the wire between the throttle body and the ECM/PCM (C20), then go to 20. |
| 13. | Turn the ignition switch OFF. |
| 14. | Disconnect the throttle body 6P connector. |
| 15. | Jump the SCS line with the HDS. |
| 16. | Disconnect ECM/PCM connector C (44P). |
| 17. | Check for continuity between ECM/PCM connector terminal C39 and throttle body 6P connector terminal No. 4.
Is there continuity? YES - Go to 25. NO - Repair open in the wire between the throttle body and the ECM/PCM (C39), then go to 20. |
| 18. | Turn the ignition switch OFF. |
| 19. | Replace the throttle body. |
| 20. | Reconnect all connectors. |
| 21. | Turn the ignition switch ON (II). |
| 22. | Reset the ECM/PCM with the HDS. |
| 23. | Do the ECM/PCM idle learn procedure. |
| 24. | Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0123 is indicated, check for poor connections or loose terminals at the throttle body and the ECM/PCM, 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 |
| 25. | Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM. |
| 26. | Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P0123 is indicated, check for poor connections or loose terminals at TP sensor A and the ECM/PCM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM.n |