DTC Troubleshooting

DTC P2123: APP Sensor A (Throttle Position Sensor D) Circuit High Voltage

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information.

1. Turn the ignition switch ON (II).
2. Check APP SENSOR A in the DATA LIST with the HDS.

Is there about 4.9 V or more?

YES - Go to step 3.

NO - Intermittent failure, the system is OK at this time. Check for poor connections or loose terminals at APP sensor A and the PCM.

3. Turn the ignition switch OFF.
4. Disconnect the APP sensor A/B 6P connector.
5. Turn the ignition switch ON (II).
6. Measure voltage between APP sensor A/B 6P connector terminals No. 5 and No. 6.






Is there about 5 V?

YES - Go to step 11.

NO - Go to step 7.

7. Turn the ignition switch OFF.
8. Jump the SCS line with the HDS.
9. Disconnect PCM connector A (44P).
10. Check for continuity between PCM connector terminal A34 and APP sensor A/B 6P connector terminal No. 6.






Is there continuity?

YES - Go to step 18.

NO - Repair open in the wire between APP sensor A and the PCM (A34), then go to step 13.

11. Turn the ignition switch OFF.
12. Replace the APP sensor.
13. Reconnect all connectors.
14. Turn the ignition switch ON (II).
15. Reset the PCM with the HDS.
16. Do the PCM idle learn procedure.
17. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P2123 indicated?

YES - Check for poor connections or loose terminals at APP sensor A and the PCM, then go to step 1.

NO - Troubleshooting is complete. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.

18. Reconnect all connectors.
19. Update the PCM if it does not have the latest software, or substitute a known-good PCM.
20. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P2123 indicated?

YES - Check for poor connections or loose terminals at APP sensor A and the PCM. If the PCM was updated, substitute a known-good PCM, then recheck. If the PCM was substituted, go to step 1.

NO - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTCs troubleshooting.