DTC Troubleshooting: P0406 (12) (K20A6 M/T)
DTC Troubleshooting: P0406 (12)
| DTC P0406: | EGR Valve Position Sensor Circuit High Voltage |
| 1. | Turn the ignition switch ON (II). |
| 2. | Check the EGR VLS in the DATA LIST with the Honda PGM tester or the HDS. Is 4.88 V or higher indicated? YES - Go to 3. NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the EGR valve and the ECM/PCM.n |
| 3. | Turn the ignition switch OFF. |
| 4. | Disconnect the EGR valve 6P connector. |
| 5. | Turn the ignition switch ON (II). |
| 6. | Measure voltage between EGR valve 6P connector terminals No. 2 and No. 3. EGR VALVE 6P CONNECTORWire side of female terminalsVCC2(YEL/BLU)SG2 (GRN/YEL) Is there about 5 V? YES - Go to 8. NO - Go to 7. |
| 7. | 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 EGR valve and the ECM/PCM (A23), then go to 10. NO - Go to 14. |
| 8. | Turn the ignition switch OFF. |
| 9. | Replace the EGR valve. |
| 10. | Turn the ignition switch ON (II). |
| 11. | Do the ECM/PCM RESET in the CLEAR MENU with the Honda PGM tester or the HDS. |
| 12. | Do the ECM/PCM idle learn procedure. |
| 13. | 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 P0406 is indicated, check for poor connections or loose terminals at the EGR valve 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 |
| 14. | Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM. |
| 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 P0406 is indicated, check for poor connections or loose terminals at the EGR valve 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 |