P0404
DTC P0404: EGR Control Circuit Range/Performance Problem1. 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 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 HDS.
Is EGR valve OK?
YES - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the EGR valve and the PCM.
NO - Go to step 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 resistance of 100 kOhms or more?
YES - Go to step 25.
NO - Go to step 8.
8. Measure resistance between EGR valve 6P connector terminals No.1 and No.3.
Is there 100 kOhms or more?
YES - Go to step 25.
NO - Go to step 9.
9. Check for continuity between EGR valve 6P connector terminal No.6 and body ground.
Is there continuity?
YES - Go to step 10.
NO - Repair open in the wire between the EGR valve and G101, then go to step 26.
10. Jump the SCS line with the HDS.
11. Disconnect PCM connector A (73P).
12. Check for continuity between PCM connector terminal A15 and body ground.
Is there continuity?
YES - Repair short in the wire between the PCM (A15) and the EGR valve, then go to step 26.
NO - Go to step 13.
13. Check for continuity between PCM connector terminal A15 and EGR valve 6P connector terminal No.4.
Is there continuity?
YES - Go to step 14.
NO - Repair open in the wire between the PCM (A15) and the EGR valve, then go to step 26.
14. Remove the EGR valve.
15. Clean the intake manifold port with carburetor cleaner. Also, clean the passage inside the EGR valve with carburetor cleaner.
16. Install the EGR valve.
17. Reconnect the EGR valve 6P connector.
18. Reconnect PCM connector A (73P).
19. Turn the ignition switch ON (II).
20. RESET the PCM withe the HDS.
21. Do the PCM idle learn procedure.
22. Start the engine. Hold the engine speed at 3,000 rpm with no load (in Park or neutral) until the radiator fan comes on, then let it idle.
23. Do the EGR TEST in the INSPECTION MENU with the HDS.
Is EGR SYSTEM OK?
YES - Go to step 30.
NO - Go to step 24.
24. Turn the ignition switch OFF.
25. Replace the EGR valve.
26. Turn the ignition switch ON (II).
27. Reset the PCM with the HDS.
28. Do the PCM idle learn procedure.
29. Start the engine. Hold the engine speed at 3,000 rpm with no load (in Park or neutral) until the radiator fan comes on, then let it idle.
30. Test-drive the vehicle under load for about 10 minutes. Try to keep the engine speed in the 1,700 - 2,500 rpm range.
31. Check for Temporary DTCs or DTCs with 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 PCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
NO - Go to step 32.
32. Monitor the OBD STATUS for DTC P0404 in the DTCs MENU with the HDS.
Does the screen indicate PASSED?
YES - Troubleshooting is complete.
NO - If the screen indicates FAILED, then go to step 1, and recheck. If the screen indicates, EXECUTING, keep the driving condition continually until a result comes on. If the screen indicates OUT OF CONDITION, go to step 30 and recheck.