| DTC P0404: | EGR Valve Circuit Range/Performance Problem |
| 1. | Turn the ignition switch ON (II). |
| 2. | Do the DTC CLEAR in the CLEAR MENU with the Honda PGM Tester or the HDS. |
| 3. | Start the engine. Hold the engine speed at 3,000 rpm (min-1) with no load (in Park or neutral) until the radiator fan comes on, then let it idle. |
| 4. | Do the EGR TEST in the INSPECTION MENU with the Honda PGM Tester or the HDS. Is the result OK? YES - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the EGR valve and the ECM/PCM.n NO - Go to 5. |
| 5. | Turn the ignition switch OFF. |
| 6. | Disconnect the EGR valve 6P connector. |
| 7. | At the sensor side, measure resistance between EGR valve 6P connector terminals No. 1 and No. 2. Is there 100 kW or more? YES - Go to 26. NO - Go to 8. |
| 8. | Measure resistance between EGR valve 6P connector terminals No. 1 and No. 3. Is there 100 kW or more? YES - Go to 26. NO - Go to 9. |
| 9. | Check for continuity between EGR valve 6P connector terminal No. 6 and body ground. Is there continuity? YES - Go to 10. NO - Repair open in the wire between the EGR valve and G101, then go to 27. |
| 10. | Jump the SCS line with the Honda PGM Tester or the HDS. |
| 11. | Disconnect ECM/PCM connector B (24P). |
| 12. | Check for continuity between ECM/PCM connector terminal B16 and body ground. Is there continuity? YES - Repair short in the wire between the ECM/PCM (B16) and the EGR valve, then go to 27. NO - Go to 13. |
| 13. | Connect EGR valve 6P connector terminal No. 4 to body ground with a jumper wire. |
| 14. | Check for continuity between ECM/PCM connector terminal B16 and body ground. Is there continuity? YES - Go to 15. NO - Repair open in the wire between the ECM/PCM (B16) and the EGR valve, then go to 27. |
| 15. | Remove the EGR valve. |
| 16. | Clean the intake manifold EGR port with carburetor cleaner. Also, clean the passage inside the EGR valve with carburetor cleaner. |
| 17. | Install the EGR valve. |
| 18. | Reconnect the EGR valve 6P connector. |
| 19. | Reconnect ECM/PCM connector B (24P). |
| 20. | Turn the ignition switch ON (ll). |
| 21. | Do the ECM/PCM RESET in the CLEAR MENU with the Honda PGM Tester or the HDS. |
| 22. | Do the ECM/PCM idle learn procedure. |
| 23. | Start the engine. Hold the engine speed at 3,000 rpm (min-1) with no load (in Park or neutral) until the radiator fan comes on, then let it idle. |
| 24. | Do the EGR TEST in the INSPECTION MENU with the Honda PGM Tester or the HDS. Is the result OK? YES - Go to 31. NO - Go to 25. |
| 25. | Turn the ignition switch OFF. |
| 26. | Replace the EGR valve. |
| 27. | Turn the ignition switch ON (II). |
| 28. | Do the ECM/PCM RESET in the CLEAR MENU with the Honda PGM Tester or the HDS. |
| 29. | Do the ECM/PCM idle learn procedure. |
| 30. | Start the engine. Hold the engine speed at 3,000 rpm (min-1) with no load (in Park or neutral) until the radiator fan comes on, then let it idle. |
| 31. | Test-drive the vehicle under load for about 10 minutes. Try to keep the engine speed in the 1,700-2,500 rpm (min-1) range. |
| 32. | 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 P0404 is indicated, check for poor connections or loose terminals at the EGR valve and the ECM/PCM, then go to 1. If connections are OK, go to the 34. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC troubleshooting. NO - Go to 33. |
| 33. | Monitor the OBD STATUS for DTC P0404 in the DTCs MENU with the Honda PGM Tester or the HDS. Is it PASSED? YES - Troubleshooting is complete.n NO - If it is FAILED, go to 1 and recheck. If it is EXECUTING, keep driving until a result comes on. If it is Out of CONDITION, go to 30 and recheck. |
| 34. | Update the ECM/PCM if it does not have the latest software, or substiture a know-good ECM/PCM. |
| 35. | Test-drive the vehicle under load for about 10 minutes. Try to keep the engine speed in the 1,700-2,500 rpm (min-1) range. |
| 36. | 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 P0404 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 ECM/PCM was substituted, replace the original ECM/PCM. |