Honda Accord 2008 Manual page 728

07/11/02 09:19:58 61TA0000_110_0409
DTC P0455: EVAP System Large Leak
Detected
DTC P0456: EVAP System Very Small Leak
Detected
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.
Special Tools Required
Vacuum pump/gauge, 0 30 in.Hg, Snap-on YA4000A
or equivalent, commercially available
NOTE:
• Before you troubleshoot, record all freeze data and
any on-board snapshot, and review the general
troubleshooting information (see page 11-3).
• 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.
1. Check the fuel fill cap (the cap must say TIGHTEN
TO CLICK). It should turn 1/4 turn after it's tight,
then it clicks.
Is the correct f uel f ill cap installed and properly
tightened?
YES − Go to step 2.
−
NO Replace or tighten the cap, then go to step 22.
−
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.
C
A
Is the f uel f ill cap seal missing or damaged, is the
f uel f ill 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 22.
NO − Go to step 3.
3. Turn the ignition switch to ON (II).
4. Clear the DTC with the HDS.
5. Do the EVAP FUNCTION TEST in the INSPECTION
MENU with the HDS.
Is the result OK ?
YES − Intermittent failure, the system is OK at this
time. Check for poor connections or loose terminals
at the FTP sensor, the EVAP canister purge valve, or
the EVAP canister vent shut valve and the ECM/
PCM.
NO − Go to step 6.
6. Turn the ignition switch to LOCK (0).
ＴＡ０８ＡＥＡＫ７２１０００９０４５５ＦＡＡＴ３０
＊０１
B
(cont'd)
11-409