DTC Troubleshooting
DTC P0123: TP Sensor A Circuit High VoltageNOTE:
- Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.
- Information marked with an asterisk (*) applies to '05-07 models.
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 step 4.
NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at the throttle body and the throttle actuator control module.
4. Check for Temporary DTCs or DTCs with the HDS.
Are DTC P0123 and P0223 indicated at the same time?
YES - Go to step 13.
NO - Go to step 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 step 18.
NO - Go to step 9.
9. Turn the ignition switch OFF.
10. Disconnect the throttle actuator control module 16P connector.
11. Connect throttle body 6P connector terminal No. 1 to body ground with a jumper wire.
12. Check for continuity between throttle actuator control module 16P connector terminal No. 10 and body ground.
Is there continuity?
YES - Substitute a known good throttle actuator control module, then Go to step 20 and recheck. If DTC P0123 is not indicated, replace the original throttle actuator control module, then Go to step 20. If DTC P0123 is indicated, Go to step 18.
NO - Repair open in the wire between the throttle body and the throttle actuator control module (TPSA line), then Go to step 20.
13. Turn the ignition switch OFF.
14. Disconnect the throttle body 6P connector.
15. Disconnect the throttle actuator control module 16P connector.
16. Connect throttle body 6P connector terminal No. 4 to body ground with a jumper wire.
17. Check for continuity between throttle actuator control module 16P connector terminal No. 9 and body ground.
Is there continuity?
YES - Substitute a known good throttle actuator control module, then Go to step 20 and recheck. If DTC P0123 is not indicated, replace the original throttle actuator control module, then Go to step 20. If DTC P0123 is indicated, Go to step 18.
NO - Repair open in the wire between the throttle body and the throttle actuator control module (SG line), then Go to step 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.
Is DTC P0123 indicated?
YES - Check for poor connections or loose terminals at the throttle body and the throttle actuator control module, then Go to step 1.
NO - Troubleshooting is complete. If any other Temporary DTCs or DTC are indicated, Go to the indicated DTC's troubleshooting.