Honda Civic. Manual — part 451

17. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0406 indicated?

YES - Check for poor connections or loose terminals at the EGR valve and the
ECM/PCM, then go to step 1.

NO - Troubleshooting is complete. If any other Temporary DTCs or DTCs are
indicated, go to the indicated DTCs troubleshooting.

18. Reconnect all connectors.
19. Update the ECM/PCM if it does not have the latest software (see UPDATING

ECM/PCM ), or substitute a known-good ECM/PCM (see SUBSTITUTING
THE ECM/PCM ).

20. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0406 indicated?

YES - Check for poor connections or loose terminals at the EGR valve and the
ECM/PCM. If the ECM/PCM was updated, substitute a known-good
ECM/PCM (see SUBSTITUTING THE ECM/PCM ), then recheck. If the
ECM/PCM was substituted, go to step 1.

NO - If the ECM/PCM was updated, troubleshooting is complete. If the
ECM/PCM was substituted, replace the original ECM/PCM (see ECM/PCM
REPLACEMENT ). If any other Temporary DTCs or DTCs are indicated, go
to the indicated DTCs troubleshooting.

DTC P2413: EGR SYSTEM MALFUNCTION

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.

NOTE:

Before you troubleshoot, record all freeze data and any on-
board snapshot, and review the general troubleshooting
information (see GENERAL TROUBLESHOOTING
INFORMATION ).

2008 Honda Civic EX

2006-08 ENGINE PERFORMANCE EGR System (R18A1) - Civic (All Except Hybrid)

3. Start the engine. Hold the engine speed at 3,000 rpm without 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 the result OK?

YES - Intermittent failure, the system is OK at this time. Check for poor
connections or loose terminals at the EGR valve and the ECM/PCM.

NO - Go to step 5.

5. Turn the ignition switch OFF.
6. Turn the ignition switch ON (II).
7. Check the EGR VLS in the DATA LIST with the HDS.

Is about 0 V indicated?

YES - Go to step 8.

NO - Go to step 21.

8. Turn the ignition switch OFF.
9. Disconnect the EGR valve 6P connector.

10. Turn the ignition switch ON (II).
11. Measure voltage between EGR valve 6P connector terminal No. 3 and body

ground.

Fig. 9: Measuring Voltage Between EGR Valve 6P Connector Terminal

2008 Honda Civic EX

2006-08 ENGINE PERFORMANCE EGR System (R18A1) - Civic (All Except Hybrid)

No. 3 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there about 5 V?

YES - Go to step 16.

NO - Go to step 12.

12. Turn the ignition switch OFF.
13. Jump the SCS line with the HDS.
14. Disconnect ECM/PCM connector B (44P).
15. Check for continuity between ECM/PCM connector terminal B18 and EGR

valve 6P connector terminal No. 3.

Fig. 10: Checking Continuity Between ECM/PCM Connector Terminal
B18 And EGR Valve 6P Connector Terminal No. 3
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Go to step 51.

NO - Repair open in the wire between the EGR valve and the ECM/PCM
(B18), then go to step 44.

16. Turn the ignition switch OFF.

2008 Honda Civic EX

2006-08 ENGINE PERFORMANCE EGR System (R18A1) - Civic (All Except Hybrid)

17. Jump the SCS line with the HDS.
18. Disconnect ECM/PCM connector B (44P).
19. Check for continuity between ECM/PCM connector terminal B29 and body

ground.

Fig. 11: Checking Continuity Between ECM/PCM Connector Terminal
B29 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Repair short in the wire between the ECM/PCM (B29) and the EGR
valve, then go to step 44.

NO - Go to step 20.

20. Check for continuity between ECM/PCM connector terminal B29 and EGR

valve 6P connector terminal No. 1.

2008 Honda Civic EX

2006-08 ENGINE PERFORMANCE EGR System (R18A1) - Civic (All Except Hybrid)