DTC Troubleshooting: P2127 (37) (K24A3 M/T)
DTC Troubleshooting: P2127 (37)
| DTC P2127: | APP Sensor B Circuit Low Voltage |
| 1. | Turn the ignition switch ON (II). |
| 2. | Check the APP SENSOR-B in the DATA LIST with the Honda PGM Tester or the HDS. Is there about 0 % or 0.1 V or less? YES - Go to 3. NO - Intermittent failure, system is OK at this time. |
| 3. | Turn the ignition switch OFF. |
| 4. | Disconnect the APP sensor 6P connector. |
| 5. | Turn the ignition switch ON (II). |
| 6. | At wire harness side, measure voltage between the APP sensor 6P connector terminals No.1 and No. 2. APP SENSOR 6P CONNECTORWire side of female terminalsSG2(GRN/YEL)VCC2 (YEL/BLU) Is there about 5 V? YES - Go to 7. NO - Go to 15. |
| 7. | Turn the ignition switch OFF. |
| 8. | At sensor side, measure resistance between the APP sensor 6P connector terminals No. 2 and No. 3 with the throttle fully closed. APP SENSOR 6P CONNECTORSG2APSBTerminal side of male terminalsIs there about 0.35-0.45 kW? YES - Go to 9. NO - Go to 16. |
| 9. | At sensor side, measure resistance between the APP sensor 6P connector terminals No. 1 and No. 3 with the throttle fully closed. APP SENSOR 6P CONNECTORVCC2APSBTerminal side of male terminalsIs there about 2.7-3.3 kW? YES - Go to 10. NO - Go to 16. |
| 10. | Jump the SCS line with the Honda PGM Tester or the HDS. |
| 11. | Disconnect ECM/PCM connector A (31P). |
| 12. | At wire harness side, check for continuity between APP sensor 6P connector terminal No. 3 and body ground. APP SENSOR 6P CONNECTORWire side of female terminalsAPSB (RED/YEL)Is there continuity? YES - Repair short in the wire between the APP sensor B and ECM/PCM (A25), then go to 17. NO - Go to 13. |
| 13. | Connect ECM/PCM connector terminal A25 to body ground with a jumper wire. ECM/PCM CONNECTOR A (31P)Wire side of female terminalsAPSB (RED/YEL)JUMPER WIRE |
| 14. | At wire harness side, check for continuity between APP sensor 6P connector terminal No. 3 and body ground. APP SENSOR 6P CONNECTORWire side of female terminalsAPSB (RED/YEL)Is there continuity? YES - Go to 22. NO - Repair open in the wire between the APP sensor B and ECM/PCM (A25), then go to 17. |
| 15. | Measure voltage between ECM/PCM connector terminals A20 and A23. ECM/PCM CONNECTOR A (31P)Wire side of female terminalsSG2(GRN/YEL)VCC2 (YEL/BLU) Is there about 5 V? YES - Repair open in the wire between the ECM/PCM (A20) and the APP sensor B, then go to 17. NO - Go to 22. |
| 16. | Replace the APP sensor. |
| 17. | Reconnect ECM/PCM connector. |
| 18. | Turn the ignition switch ON (II). |
| 19. | Do the ECM/PCM RESET in the CLEAR MENU with the Honda PGM Tester or the HDS. |
| 20. | Do the ECM/PCM idle learn procedure. |
| 21. | 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 P2127 is indicated, check for poor connections or loose terminals at the APP sensor B 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 |
| 22. | Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM. |
| 23. | 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 P2127 is indicated, check for poor connections or loose terminals at the APP sensor B 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. |