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 0.2 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 APP sensor B 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. 1 and No. 2.
Is there about 5 V?
YES - Go to step 1.
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 0.2 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 DTC's troubleshooting.
25. Turn the ignition switch OFF.
26. Reconnect all connectors.
27. Update the ECM/PCM if it does not have the latest software, or substitute a known good ECM/PCM
28. 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. 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 DTC's are indicated, Go to the indicated DTC's troubleshooting.