Honda Civic. Manual — part 449

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
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. Clean any carbon
build-up on the EGR valve with throttle plate and induction cleaner.

NO - Go to step 5.

5. Turn the ignition switch OFF.
6. Disconnect the EGR valve 6P connector.
7. At the EGR valve side, measure resistance between EGR valve 6P connector

terminals No. 1 and No. 2.

Fig. 2: Measuring Resistance Between EGR Valve 6P Connector
Terminals No. 1 And No. 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there 100 kohms or more?

YES - Go to step 25.

NO - Go to step 8.

2008 Honda Civic EX

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

8. At the EGR valve side, measure resistance between EGR valve 6P connector

terminals No. 1 and No. 3.

Fig. 3: Measuring Resistance Between EGR Valve 6P Connector
Terminals No. 1 And No. 3
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there 100 k ohms 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.

Fig. 4: Checking Continuity Between EGR Valve 6P Connector Terminal
No. 1 And No. 3
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

2008 Honda Civic EX

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

YES - Go to step 10.

NO - Repair open in the wire between the EGR valve and G101; A/T model
(see CONNECTOR TO HARNESS INDEX ), M/T model (see
CONNECTOR TO HARNESS INDEX ), then go to step 26.

10. Jump the SCS line with the HDS.
11. Disconnect ECM/PCM connector B (44P).
12. Check for continuity between ECM/PCM connector terminal B2 and body

ground.

Fig. 5: Checking Continuity Between ECM/PCM Connector Terminal B2
And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Repair short in the wire between the ECM/PCM (B2) and the EGR
valve, then go to step 26.

NO - Go to step 13.

13. Check for continuity between ECM/PCM connector terminal B2 and EGR

valve 6P connector terminal No. 4.

2008 Honda Civic EX

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

Fig. 6: Checking Continuity Between ECM/PCM Connector Terminal B2
And EGR Valve 6P Connector Terminal No. 4
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Go to step 14.

NO - Repair open in the wire between the ECM/PCM (B2) and the EGR valve,
then go to step 26.

14. Remove the EGR valve (see EGR VALVE REPLACEMENT ).
15. Clean the intake manifold EGR port and the EGR pipe (see EGR VALVE

REPLACEMENT ) with throttle plate and induction cleaner. Also, clean the
passage inside the EGR valve with throttle plate and induction cleaner.

16. Install the EGR valve (see EGR VALVE REPLACEMENT ).
17. Reconnect the EGR valve 6P connector.
18. Reconnect ECM/PCM connector B (44P).
19. Turn the ignition switch ON (II).
20. Reset the ECM/PCM with the HDS.
21. Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN

PROCEDURE ).

22. 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.

23. Do the EGR TEST in the INSPECTION MENU with the HDS.

2008 Honda Civic EX

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