Honda Civic. Manual — part 599

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

Fig. 15: Checking Continuity Between ECM 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 (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 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 (K20Z3) - Civic (Except GX & Si)

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 connector terminal A26 and body ground.

Fig. 17: Checking Continuity Between ECM 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 (A26) and the FTP sensor,
then go to step 28.

26. Turn the ignition switch OFF.
27. Replace the FTP sensor (see FTP SENSOR REPLACEMENT ).
28. Reconnect all connectors.
29. Turn the ignition switch ON (II).
30. Reset the ECM with the HDS.
31. Do the ECM idle learn procedure (see ECM IDLE LEARN PROCEDURE ).
32. Check for Temporary DTCs or DTCs with the HDS.

Is DTC P0453 indicated?

2008 Honda Civic EX

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

YES - Check for poor connections or loose terminals at the FTP sensor and the
ECM, 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 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.

34. Reconnect all connectors.
35. 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 ).

36. Start the engine, and let it idle.
37. 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. If the ECM was updated, substitute a known-good ECM (see
SUBSTITUTING THE ECM ), then go to step 36. If the ECM 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?

2008 Honda Civic EX

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

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 37, 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. If the ECM was updated, substitute a
known-good ECM (see SUBSTITUTING THE ECM ), then go to step 36. If
the ECM 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.

NOTE:

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

Fresh fuel has a higher volatility that will create greater
pressure/vacuum. The optimum condition for testing is
less than a full tank of fresh fuel. If possible, to assist in
leak detection, add 1 gallon of fresh fuel to the tank (as
long as it will not fill the tank), just before starting these
procedures.

2008 Honda Civic EX

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