DTC Troubleshooting

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.

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, system is OK at this time. Check for poor connections or loose terminals at APP sensor A and the ECM/PCM.

3. Turn the ignition switch OFF.
4. Disconnect the APP sensor 6P connector.
5. Turn the ignition switch ON (II).




6. Measure voltage between APP sensor 6P connector terminals No. 2 and No. 3.

Is there about 5 V?

YES - Go to step 8.

NO - Go to step 7.




7. Measure voltage between ECM/PCM connector terminals D10 and D12.

Is there about 5 V?

YES - Repair open in the wire between the ECM/PCM (D10) and the APP sensor, then go to step 10.

NO - Go to step 15.

8. Turn the ignition switch OFF.
9. Replace the accelerator pedal module.
10. Reconnect all connectors.
11. Turn the ignition switch ON (II).
12. Reset the ECM/PCM with the HDS.
13. Do the ECM/PCM idle learn procedure.
14. Check for Temporary DTCs or DTCs with the HDS.

Are any Temporary DTCs or DTCs indicated?

YES - If Temporary DTC or DTC P2123 is indicated, check for poor connections or loose terminals at APP sensor A and the ECM/PCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.

NO - Troubleshooting is complete.

15. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM.
16. 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 ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM, then recheck. If the ECM/PCM was substituted, go to step 1.

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