DTC Troubleshooting

DTC Troubleshooting: P2123

DTC P2123:

APP Sensor A (TP Sensor D) Circuit High Voltage

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

1. Turn the ignition switch to 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 the APP sensor and the PCM.�

3. Turn the ignition switch to LOCK (0).

4. Disconnect the APP sensor 6P connector.

5. Turn the ignition switch to ON (II).

6. Measure the voltage between APP sensor 6P connector terminals No. 4 and No. 5.





Is there about 5 V?

YES -

Go to step 12.

NO -

Go to step 7.

7. Turn the ignition switch to LOCK (0).

8. Jump the SCS line with the HDS.

9. Disconnect PCM connector A (49P).

10. Connect APP sensor 6P connector terminal No. 5 to body ground with a jumper wire.






11. Check for continuity between PCM connector terminal A26 and body ground.





Is there continuity?

YES -

Go to step 19.

NO -

Repair an open in the wire between the APP sensor and the PCM (A26), then go to step 14.

12. Turn the ignition switch to LOCK (0).

13. Replace the accelerator pedal module Service and Repair.

14. Reconnect all connectors.

15. Turn the ignition switch to ON (II).

16. Reset the PCM with the HDS.

17. Do the PCM idle learn procedure PCM Idle Learn Procedure.

18. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P2123 indicated?

YES -

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

NO -

Troubleshooting is complete. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.�

19. Reconnect all connectors.

20. Update the PCM if it does not have the latest software PCM Update, or substitute a known-good PCM.

21. Check for Pending or Confirmed DTCs with the HDS.

Is DTC P2123 indicated?

YES -

Check for poor connections or loose terminals at the APP sensor and the PCM, then go to step 1. 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 Service and Repair. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.�