Honda Civic. Manual — part 607

Fig. 39: Disconnecting Air Tube From FTP Sensor
Courtesy of AMERICAN HONDA MOTOR CO., INC.

18. Check the FTP SENSOR in the DATA LIST with the HDS.

Is it between - 0.67 and 0.67 kPa (- 0.2 and 0.2 in.Hg, - 5 and 5 mmHg), or 2.4
and 2.6 V?

YES - Check for a blockage in the FTP sensor air tube or vent, then go to step
23.

NO - Go to step 19.

19. Turn the ignition switch OFF.
20. Remove the FTP sensor (A) from the EVAP canister with its connector

connected (see EVAP CANISTER REPLACEMENT ).

Fig. 40: Removing FTP Sensor
Courtesy of AMERICAN HONDA MOTOR CO., INC.

2008 Honda Civic EX

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

21. Turn the ignition switch ON (II).
22. Check the FTP SENSOR in the DATA LIST with the HDS.

Is it between - 0.67 kPa and 0.67 kPa (- 0.2 and 0.2 in.Hg, - 5 and 5 mmHg),
or 2.4 and 2.6 V?

YES - Check for debris or clogging at the EVAP canister and the FTP sensor
port, then go to step 23.

NO - Replace the FTP sensor (see FTP SENSOR REPLACEMENT ), then
go to step 23.

23. Turn the ignition switch ON (II).
24. Reset the ECM with the HDS.
25. Do the ECM idle learn procedure (see ECM IDLE LEARN PROCEDURE ).
26. Start the engine. Hold the engine speed at 3,000 rpm without load (in neutral)

until the radiator fan comes on, then let it idle.

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

Is DTC P1454 and/or P2422 indicated?

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

NO - Go to step 28.

28. Monitor the OBD STATUS for DTC PI 454 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 27, go to the indicated DTC's troubleshooting.

NO - If the screen indicates FAILED, check for poor connections or loose
terminals at the FTP sensor, the EVAP canister vent shut valve, and the ECM,
then go to step 1. If the screen indicates NOT COMPLETED, keep idling until

2008 Honda Civic EX

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

a result comes on.

DTC P145C: EVAP SYSTEM PURGE FLOW MALFUNCTION ('07 MODEL)

FUEL CAP WARNING MESSAGE SYSTEM TROUBLESHOOTING

Special Tools Required

Vacuum/pressure gauge, 0-4 in.Hg 07JAZ-001000B

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

When the fuel cap warning message does not go off after fuel cap tightened, or the
message turned on frequently, do this troubleshooting procedure.

'07-08 model

1. Check the fuel fill cap (the cap must say "TIGHTEN TO CLICK"). It should

turn 1/4 after it's tight, then it clicks.

Is the correct fuel fill cap installed and properly tightened?

YES - Go to step 2.

NO - Replace or tighten the cap, then go to step 13.

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 P145C is indicated alone, do the troubleshooting
for DTC P0496 and P0497 using freeze date for P145C.

If any of the DTCs listed below are indicated at the
same time as DTC P145C, troubleshoot those DTC first,
then recheck for P145C:

P0496, P0497: EVAP system purge flow

2008 Honda Civic EX

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

2. Check the fuel fill cap seal (A) and the fuel fill pipe mating surface (B). Verify

that the fuel fill cap tether cord (C) is not caught under the cap.

Fig. 41: Checking Fuel Fill Cap Seal And Fuel Fill Pipe Mating Surface
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is the fuel fill cap seal missing or damaged, is the fuel fill pipe damaged, or is
the tether cord caught under the cap?

YES - Replace the fuel fill cap or the fuel fill pipe, then go to step 13.

NO - Go to step 3.

3. Reinstall and tighten the fuel fill cap.
4. Clear the DTC with the HDS.
5. 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 for 1 minute.

6. Test drive at 45 mph (72 km/h) for 1 minute or more.

Does fuel cap warning message come on?

YES - Go to step 7.

NO - Intermittent failure, the system is OK at this time.

7. Turn the ignition switch OFF.
8. Disconnect the vacuum hose (A) from the EVAP canister purge valve (B) in

the engine compartment, and connect a T-fitting (C) from the vacuum gauge

2008 Honda Civic EX

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