| DTC P2127: | APP sensor B Circuit Low Voltage |
| 1. | Turn the ignition switch ON (II). |
| 2. | Do the DTC CLEAR in the CLEAR MENU with the HDS. |
| 3. | Turn the ignition switch OFF. |
| 4. | Turn the ignition switch ON (II). |
| 5. | Check for Temporary DTCs or DTCs in the DTCs MENU with the HDS. Are DTC P0405 and P2127 indicated at the same time? YES - Go to 23. NO - Go to 6. |
| 6. | Open the throttle to full position several times. |
| 7. | Check the APP SENSOR-B in the DATA LIST with the HDS. Is there about 0 %, or 0.62 V or less when the throttle is fully opened? YES - Go to 8. NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the APP sensor B and the ECM.n |
| 8. | Turn the ignition switch OFF. |
| 9. | Disconnect the APP sensor 6P connector. |
| 10. | Turn the ignition switch ON (II). |
| 11. | At the wire harness side, measure voltage between the APP sensor 6P connector terminals No. 4 and No. 6.
Is there about 5 V? YES - Go to 12. NO - Go to 19. |
| 12. | Turn the ignition switch OFF. |
| 13. | At the APP sensor side, measure resistance between the APP sensor 6P connector terminals No. 5 and No. 6.
Is there continuity? YES - Go to 14. NO - Go to 31. |
| 14. | At the APP sensor side, measure resistance between the APP sensor 6P connector terminals No. 4 and No. 5.
Is there about 0 W? YES - Go to 31. NO - Go to 15. |
| 15. | Connect the ECM test harness and the test pin box to the wire harness only, not to the ECM. |
| 16. | Check for continuity between test pin box terminal No. 79 and body ground. Is there continuity? YES - Repair short in the wire between the ECM connector No. 3 terminal No. 50 (test pin box terminal No. 79) and the APP sensor B, then go to 33. NO - Go to 17. |
| 17. | Connect the APP sensor 6P connector terminal No. 5 to body ground with a jumper wire.
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| 18. | Check for continuity between test pin box terminal No. 79 and body ground. Is there continuity? YES - Go to 38. NO - Repair open in the wire between the ECM connector No. 3 terminal No. 50 (test pin box terminal No. 79) and the APP sensor B, then go to 33. |
| 19. | Turn the ignition switch OFF, and wait 10 seconds. |
| 20. | Connect the ECM test harness and the test pin box between the ECM and connector.. |
| 21. | Turn the ignition switch ON (II). |
| 22. | Measure voltage between test pin box terminals No. 32 and No. 59. Is there about 5 V? YES - Repair open in the wire between the ECM connector No. 3 terminal No. 3 (test pin box terminal No. 32) and the APP sensor B, then go to 33. NO - Go to 38. |
| 23. | Turn the ignition switch OFF, and wait 10 seconds. |
| 24. | Connect the ECM test harness and the test pin box to the wire harness only, not to the ECM. |
| 25. | Disconnect the connectors from the these sensors:
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| 26. | Check for continuity between body ground and the test pin box terminals No. 32 and No. 45 individually. Is there continuity? YES - Repair short in the wire between the ECM connector No. 3 terminal No. 3 or No. 16 (test pin box terminal No. 32 or No. 45) and the each sensor, then go to 33. NO - Go to 27. |
| 27. | Connect the ECM test harness to the ECM. |
| 28. | Turn the ignition switch ON (II). |
| 29. | Measure voltage between test pin box terminal No. 45 and body ground. Is there about 5 V? YES - Go to 30. NO - Go to 38. |
| 30. | Continue to monitor voltage at the test pin box terminals No.45 while reconnecting the following sensors, one at a time.
Did the voltage drop to about 0 V? YES - Replace the sensor that caused the voltage to drop, then go to 33. NO - Go to 38. |
| 31. | Turn the ignition switch OFF. |
| 32. | Replace the APP sensor. |
| 33. | Reconnect all connectors. |
| 34. | Turn the ignition switch ON (II). |
| 35. | Do the ECM RESET in the CLEAR MENU with the HDS. |
| 36. | Do the ETCS learn procedure. |
| 37. | Check for Temporary DTCs or DTCs in the DTCs MENU with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2127 is indicated, check for poor connections or loose terminals at the APP sensor B and the ECM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC troubleshooting. NO - Troubleshooting is complete.n |
| 38. | Substitute a known-good ECM. |
| 39. | Check for temporary DTCs or DTCs in the DTCs MENU with the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2127 is indicated, check for poor connections or loose terminals at the APP sensor B and the ECM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC troubleshooting. |