DTC Troubleshooting
DTC P2127: APP Sensor B (TP Sensor E) Circuit Low VoltageNOTE: 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 B in the DATA LIST with the HDS.
Is there about 0.1 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 APP sensor Band 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. 1 and No. 2.
Is there about 5 V?
YES - Go to step 7.
NO - Go to step 17.
7. Turn the ignition switch OFF.
8. Jump the SCS line with the HDS.
9. Disconnect ECM/PCM connector A (31P).
10. Check for continuity between APP sensor 6P connector terminal No. 3 and body ground.
Is there continuity?
YES - Repair short in the wire between APP sensor B and the ECM/PCM (A25), then go to step 20.
NO - Go to step 11.
11. Connect APP sensor 6P connector terminal No. 3 to body ground with a jumper wire.
12. Check for continuity between ECM/PCM connector terminal A25 and body ground.
Is there continuity?
YES - Go to step 13.
NO - Repair open in the wire between APP sensor B and the ECM/PCM (A25), then go to step 20.
13. Reconnect ECM/PCM connector A (31P).
14. Connect APP sensor 6P connector terminals No. 1 and No. 3 with a jumper wire.
15. Turn the ignition switch ON (II).
16. Check APP SENSOR B in the DATA LIST with the HDS.
Is there about 0.1 V or less?
YES - Go to step 25.
NO - Go to step 18.
17. Measure voltage between ECM/PCM connector terminals A20 and A23.
Is there about 5 V?
YES - Repair open in the wire between APP sensor B and the ECM/PCM (A20), then go to step 20.
NO - Go to step 25.
18. Turn the ignition switch OFF.
19. Replace the APP sensor.
20. Reconnect all connectors.
21. Turn the ignition switch ON (II).
22. Reset the ECM/PCM with the HDS.
23. Do the ECM/PCM idle learn procedure.
24. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P2127 indicated?
YES - Check for poor connections or loose terminals at APP sensor B 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 DTCs troubleshooting.
25. Reconnect all connectors.
26. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM.
27. Check for Temporary DTCs or DTCs with the HDS.
Is DTC P2127 indicated?
YES - Check for poor connections or loose terminals at APP sensor B and the ECM/PCM, then go to step 1. 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 DTCs troubleshooting.