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), or press the engine start/stop button to select the ON mode.
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 PCM.�
3. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
4. Disconnect the APP sensor 6P connector.
5. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
6. Measure the voltage between APP sensor 6P connector terminals No. 4 and No. 5.
Is there about 5 V?
YES -
Go to step 7.
NO -
Go to step 17.
7. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
8. Jump the SCS line with the HDS.
9. Disconnect PCM connector A (49P).
10. Check for continuity between APP sensor 6P connector terminal No. 6 and body ground.
Is there continuity?
YES -
Repair a short in the wire between the PCM(A19) and the APP sensor, then go to step 24.
NO -
Go to step 11.
11. Connect APP sensor 6P connector terminal No. 6 to body ground with a jumper wire.
12. Check for continuity between PCM connector terminal A19 and body ground.
Is there continuity?
YES -
Go to step 13.
NO -
Repair an open in the wire between the PCM(A19) and the APP sensor, then go to step 24.
13. Reconnect PCM connector A (49P).
14. Connect APP sensor 6P connector terminals No. 4 and No. 6 with a jumper wire.
15. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
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), or press the engine start/stop button to select the OFF mode.
18. Jump the SCS line with the HDS.
19. Disconnect PCM connector A (49P).
20. Connect APP sensor 6P connector terminal No. 4 to body ground with a jumper wire.
21. Check for continuity between PCM connector terminal A25 and body ground.
Is there continuity?
YES -
Go to step 30.
NO -
Repair an open in the wire between the PCM(A25) and the APP sensor, then go to step 24.
22. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
23. Replace the accelerator pedal module Service and Repair.
24. Reconnect all connectors.
25. Turn the ignition switch to ON (II), or press the engine start/stop button to select the ON mode.
26. Reset the PCM with the HDS.
27. Do the PCM idle learn procedure PCM Idle Learn Procedure.
28. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P2127 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.�
29. Turn the ignition switch to LOCK (0), or press the engine start/stop button to select the OFF mode.
30. Reconnect all connectors.
31. Update the PCM if it does not have the latest software PCM Update, or substitute a known-good PCM.
32. Check for Pending or Confirmed DTCs with the HDS.
Is DTC P2127 indicated?
YES -
Check for poor connections or loose terminals at the APP sensor 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 Service and Repair. If any other Pending or Confirmed DTCs are indicated, go to the indicated DTC's troubleshooting.�