DTC Troubleshooting

DTC Troubleshooting: P2127

DTC P2127: APP Sensor B (TP Sensor E) Circuit Low 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 B in the DATA LIST with the HDS.

Is there about 0.2 V or less?
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 ECM/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. 5 and No. 6.

Is there about 5 V?
YES - Go to step 7.

NO - Go to step 17.






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

8. Jump the SCS line with the HDS.

9. Disconnect ECM/PCM connector A (44P).

10. Check for continuity between APP sensor 6P connector terminal No. 4 and body ground.

Is there continuity?
YES - Repair short in the wire between the ECM/PCM (A18) and the APP sensor, then go to step 24.

NO - Go to step 11.






11. Connect APP sensor 6P connector terminal No. 4 to body ground with a jumper wire.






12. Check for continuity between ECM/PCM connector terminal A18 and body ground.

Is there continuity?
YES - Go to step 13.

NO - Repair open in the wire between the ECM/PCM (A18) and the APP sensor, then go to step 24.






13. Reconnect ECM/PCM connector A (44P).

14. Connect APP sensor 6P connector terminals No. 4 and No. 6 with a jumper wire.

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

16. Check APP SENSOR B in the DATA LIST with the HDS.

Is there about 0.2 V or less?
YES - Go to step 29.

NO - Go to step 22.






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

18. Jump the SCS line with the HDS.

19. Disconnect ECM/PCM connector A (44P).

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






21. Check for continuity between ECM/PCM connector terminal A24 and body ground.

Is there continuity?
YES - Go to step 30.

NO - Repair open in the wire between the ECM/PCM (A24) and the APP sensor, then go to step 24.






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

23. Replace the accelerator pedal module. Service and Repair

24. Reconnect all connectors.

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

26. Reset the ECM/PCM with the HDS.

27. Do the ECM/PCM idle learn procedure. ECM/PCM Idle Learn Procedure (A/T)

28. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P2127 indicated?
YES - Check for poor connections or loose terminals at the APP sensor and the ECM/PCM, then go to step 1.

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


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

30. Reconnect all connectors.

31. Update the ECM/PCM if it does not have the latest software, ECM/PCM Update (A/T) or substitute a known-good ECM/PCM. Initial Inspection and Diagnostic Overview

32. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P2127 indicated?
YES - Check for poor connections or loose terminals at the APP sensor and the ECM/PCM. If the ECM/PCM was updated, substitute a known-good ECM/PCM, Initial Inspection and Diagnostic Overview 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. Service and Repair If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.