Honda Civic. Manual — part 596

Fig. 6: Checking Continuity Between ECM Terminal B3 And EVAP
Canister Purge Valve 2P Terminal No. 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Go to step 22.

NO - Repair open in the wire between the EVAP canister purge valve and the
ECM (B3), then go to step 24.

22. At the valve side, measure resistance between EVAP canister purge valve 2P

connector terminals No. 1 and No. 2.

Fig. 7: Measuring Resistance Between EVAP Canister Purge Valve 2P
Connector Terminals No. 1 And 2
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there about 25 ohms at room temperature?

YES - Go to step 30.

NO - Go to step 23.

23. Replace the EVAP canister purge valve (see EVAP CANISTER VENT

SHUT VALVE REPLACEMENT ).

24. Reconnect all connectors.
25. Turn the ignition switch ON (II).
26. Reset the ECM with the HDS.

2008 Honda Civic EX

2006-08 ENGINE PERFORMANCE EVAP System (K20Z3) - Civic (Except GX & Si)

27. Do the ECM idle learn procedure (see ECM IDLE LEARN PROCEDURE ).
28. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0443 indicated?

YES - Check for poor connections or loose terminals at the EVAP canister
purge valve and the ECM, then go to step 1.

NO - Go to step 29.

29. Monitor the OBD STATUS for DTC P0443 in the DTCs MENU with the

HDS.

Does the screen indicate PASSED?

YES - Troubleshooting is complete. If any other Temporary DTCs or DTCs
were indicated in step 28, go to the indicated DTC's troubleshooting.

NO - If the screen indicates FAILED, check for poor connections or loose
terminals at the EVAP canister purge valve and the ECM, then go to step 1. If
the screen indicates EXECUTING or OUT OF CONDITION, keep idling until
a result comes on.

30. Reconnect all connectors.
31. Update the ECM if it does not have the latest software (see UPDATING THE

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

32. Start the engine, and let it idle.
33. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0443 indicated?

YES - Check for poor connections or loose terminals at the EVAP canister
purge valve and the ECM. If the ECM was updated, substitute a known-good
ECM (see SUBSTITUTING THE ECM ), then go to step 32. If the ECM was
substituted, go to step 1.

2008 Honda Civic EX

2006-08 ENGINE PERFORMANCE EVAP System (K20Z3) - Civic (Except GX & Si)

NO - Go to step 34.

34. Monitor the OBD STATUS for DTC P0443 in the DTCs MENU with the

HDS.

Does the screen indicate PASSED?

YES - If the ECM was updated, troubleshooting is complete. If the ECM was
substituted, replace the original ECM (see ECM REPLACEMENT ). If any
other Temporary DTCs or DTCs were indicated in step 33, go to the indicated
DTC's troubleshooting.

NO - If the screen indicates FAILED, check for poor connections or loose
terminals at the EVAP canister purge valve and the ECM. If the ECM was
updated, substitute a known-good ECM (see SUBSTITUTING THE ECM ),
then go to step 32. If the ECM was substituted, go to step 1. If the screen
indicates EXECUTING or OUT OF CONDITION, keep idling until a result
comes on.

DTC P0451: FTP SENSOR CIRCUIT RANGE/PERFORMANCE PROBLEM

1. Turn the ignition switch ON (II).
2. Clear the DTC with the HDS.
3. Start the engine, and let it idle 1 minute.
4. Monitor the OBD STATUS for DTC P0451 in the DTCs MENU with the

HDS.

Does the screen indicate FAILED?

NOTE:

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

If DTC P2422 is stored at the same time as DTC P0451,
troubleshoot DTC P2422 first, then recheck for DTC
P0451.

2008 Honda Civic EX

2006-08 ENGINE PERFORMANCE EVAP System (K20Z3) - Civic (Except GX & Si)

YES - Go to step 5.

NO - If the screen indicates PASSED, intermittent failure, the system is OK at
this time. Check for poor connections or loose terminals at the FTP sensor and
the ECM. If the screen indicates NOT COMPLETED, keep idling until a result
comes on.

5. Turn the ignition switch OFF.
6. Replace the FTP sensor (see FTP SENSOR REPLACEMENT ).
7. Turn the ignition switch ON (II).
8. Reset the ECM with the HDS.
9. Do the ECM idle learn procedure (see ECM IDLE LEARN PROCEDURE ).

10. Start the engine, and let it idle 1 minute.
11. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0451 indicated?

YES - Check for poor connections or loose terminals at the FTP sensor and the
ECM, then go to step 1.

NO - Go to step 12.

12. Monitor the OBD STATUS for DTC P0451 in the DTCs MENU with the

HDS.

Does the screen indicate PASSED?

YES - Troubleshooting is complete. If any other Temporary DTCs or DTCs
were indicated in step 11, go to the indicated DTC's troubleshooting.

NO - If the screen indicates FAILED, check for poor connections or loose
terminals at the FTP sensor and the ECM, then go to step 1. If the screen
indicates NOT COMPLETED, keep idling until a result comes on.

DTC P0452: FTP SENSOR CIRCUIT LOW VOLTAGE

NOTE:

Before you troubleshoot, record all freeze data and any on-

2008 Honda Civic EX

2006-08 ENGINE PERFORMANCE EVAP System (K20Z3) - Civic (Except GX & Si)