Honda 2004 Odyssey, Service Manual

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DTC P1456 ’02-04 Models:
Special Tools Required
Fuel Fill Cap Check
YES
NO
YES
NO
EVAP Canister Purge Valve Test
YES
NO
11-278
EVAP System
DTC Troubleshooting (cont’d)
A
A973X-041-
XXXXX
EVAP Control
System Leakage (fuel tank system)
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.
Vacuum pump/gauge, 0 30 in.Hg A973X-041-XXXXX
NOTE: If DTC P0461 is stored at the same time as DTC
P1456, troubleshoot P0461 first, then recheck for DTC
P1456.
This is a two trip code; once cleared, it cannot be
reproduced in one trip. Also, certain specific driving
and ambient conditions must occur before the PCM will
complete the system checks. Additional test drives may
still not meet the specific conditions needed to
reproduce the code.
Follow these troubleshooting procedures carefully to
ensure the integrity of the system and to confirm the
cause of the problem or code.
NOTE: Fresh fuel has a higher volatility that will create
greater pressure/vacuum. The optimum condition for
testing is fresh fuel and less than a full tank of gas. 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. It must say ‘‘If not tightened
3 clicks check engine light may come on.’’
Go to step 2.
Replace or tighten the cap.
2. Check the fuel fill cap seal.
Replace the fuel fill cap (gray or black
colored cap).
The fuel fill cap is OK. Go to step 3.
3. Disconnect the vacuum hose from the EVAP
canister purge valve (A), and connect a vacuum
pump to the hose.
4. Turn the ignition switch ON (II).
5. Apply vacuum to the hose.
The EVAP canister purge valve is OK. Go to
step 11.
Go to step 6.
6. Turn the ignition switch OFF.
7. Disconnect the EVAP canister purge valve 2P
connector.
Is the cor r ect f uel f ill cap installed and pr oper ly
tightened?
Is the f uel f ill cap seal missing or damaged?
Does the valve hold vacuum?
03/07/29 09:26:11 61S0X050_110_0278