Honda Civic. Manual — part 614

20. Check for continuity between ECM/PCM connector terminal A9 and body

ground.

Fig. 15: Checking Continuity Between ECM/PCM Connector Terminal A9
And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Go to step 34.

NO - Repair open in the wire between the ECM/PCM (A9) and the FTP
sensor, then go to step 28.

21. Turn the ignition switch OFF.
22. Jump the SCS line with the HDS.
23. Disconnect ECM/PCM connector A (44P).
24. Connect FTP sensor 3P connector terminal No. 2 to body ground with a jumper

wire.

2008 Honda Civic EX

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

Fig. 16: Connecting FTP Sensor 3P Connector Terminal No. 2 To Body
Ground With Jumper Wire
Courtesy of AMERICAN HONDA MOTOR CO., INC.

25. Check for continuity between ECM/PCM connector terminal A26 and body

ground.

Fig. 17: Checking Continuity Between ECM/PCM Connector Terminal
A26 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Go to step 34.

NO - Repair open in the wire between the ECM/PCM (A26) and the FTP
sensor, then go to step 28.

26. Turn the ignition switch OFF.

2008 Honda Civic EX

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

27. Replace the FTP sensor (see FTP SENSOR REPLACEMENT ).
28. Reconnect all connectors.
29. Turn the ignition switch ON (II).
30. Reset the ECM/PCM with the HDS.
31. Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN

PROCEDURE ).

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

Is DTC P0453 indicated?

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

NO - Go to step 33.

33. Monitor the OBD STATUS for DTC P0453 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 32, go to the indicated DTCs troubleshooting.

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

34. Reconnect all connectors.
35. 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 ).

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

Is DTC P0453 indicated?

2008 Honda Civic EX

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

YES - Check for poor connections or loose terminals at the FTP sensor and the
ECM/PCM. If the ECM/PCM was updated, substitute a known-good
ECM/PCM (see SUBSTITUTING THE ECM/PCM ), then go to step 36. If
the ECM/PCM was substituted, go to step 1.

NO - Go to step 38.

38. Monitor the OBD STATUS for DTC P0453 in the DTCs MENU with the

HDS.

Does the screen indicate PASSED?

YES - 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 were indicated in
step 37, go to the indicated DTCs troubleshooting.

NO - If the screen indicates FAILED, check for poor connections or loose
terminals at the FTP sensor and the ECM/PCM. If the ECM/PCM was updated,
substitute a known-good ECM/PCM (see SUBSTITUTING THE
ECM/PCM ), then go to step 36. If the ECM/PCM was substituted, go to step
1. If the screen indicates NOT COMPLETED, keep idling until a result comes
on.

DTC P0455: EVAP SYSTEM LARGE LEAK DETECTED; DTC P0456: EVAP SYSTEM VERY
SMALL LEAK DETECTED

Special Tools Required

Vacuum pump/gauge, 0-30 in.Hg, Snap-on YA4000A or equivalent, commercially
available

NOTE:

The fuel system is designed to allow specified maximum
vacuum and pressure conditions. Do not deviate from the
vacuum and pressure tests as indicated in these
procedures. Excessive pressure/vacuum would damage the
EVAP components or cause eventual fuel tank failure.

2008 Honda Civic EX

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