| DTC P2138: | APP Sensor A/B Incorrect Voltage correlation |
| 1. | Turn the ignition switch ON (II). |
| 2. | Check the APP SENSOR-A and APP SENSOR-B in the DATA LIST with the Honda PGM Tester or the HDS. Does APP SENSOR-A and APP SENSOR-B change in the same throttle angle when the throttle is fully opened? YES - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the APP sensor and at the ECM/PCM.n NO - Go to 3. |
| 3. | Check the APP SENSOR-A and APP SENSOR-B in the DATA LIST with the Honda PGM Tester or the HDS. Are they the same voltage? YES - Go to 4. NO - Go to 9. |
| 4. | Turn the ignition switch OFF. |
| 5. | Jump the SCS line with the Honda PGM Tester or the HDS. |
| 6. | Disconnect the APP sensor 6P connector. |
| 7. | Disconnect ECM/PCM connector A (31P). |
| 8. | Check for continuity between ECM/PCM connector terminals A25 and A26. Is there continuity? YES - Repair short in the wire between the ECM/PCM (A25) and the ECM/PCM (A26), then go to 11. NO - Go to 16. |
| 9. | Turn the ignition switch OFF. |
| 10. | Replace the APP sensor. |
| 11. | Reconnect ECM/PCM connector A (31P). |
| 12. | Turn the ignition switch ON (II). |
| 13. | Do the ECM/PCM RESET in the CLEAR MENU with the Honda PGM Tester or the HDS. |
| 14. | Do the ECM/PCM idle learn procedure. |
| 15. | Check for Temporary DTCs or DTCs in the DTCs MENU with the Honda PGM Tester or the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2138 is indicated, check for poor connections or loose terminals at the APP sensor and the ECM/PCM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC troubleshooting. NO - Troubleshooting is complete.n |
| 16. | Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM. |
| 17. | Check for Temporary DTCs or DTCs in the DTCs MENU with the Honda PGM Tester or the HDS. Are any Temporary DTCs or DTCs indicated? YES - If DTC P2138 is indicated, check for poor connections or loose terminals at the APP sensor and the ECM/PCM, then go to 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM.n |