Honda 2004 Odyssey Service Manual page 596

DTC P1457 '01 Model:
Leakage (EVAP canister 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 system failure.
Special Tools Required
Vacuum pump/gauge, 0 30 in.Hg A973X-041-XXXXX
NOTE: If DTC P0461 is stored at the same time as DTC
P1457, troubleshoot P0461 first, then recheck for DTC
P1457.
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. Use the test drive procedures for
setting the readiness code (see page 11-89).
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 high volatility that creates
greater pressure/vacuum. The optimum condition for
testing is fresh fuel, and there must be less than a full
tank of 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.
EVAP Canister Purge Valve Test
1. Disconnect the vacuum hose from the EVAP
canister purge valve (A), and connect a vacuum
pump to the hose.
A
EVAP Control System
A973X-
041-XXXXX
2. Turn the EVAP canister purge valve on with the
HDS, or connect PCM connector terminal E11 to
body ground with a jumper wire.
PCM CONNECTOR E (31P)
PCS
(RED/YEL)
JUMPER WIRE
Wire side of female terminals
3. Turn the ignition switch ON (II).
4. Apply vacuum to the hose.
Does the valve hold vacuum?
YES Go to step 5.
NO The EVAP canister purge valve is OK. Go to
step 10.
5. Turn the ignition switch OFF.
6. Disconnect the EVAP canister purge valve 2P
connector.
7. Check for continuity between EVAP canister purge
valve 2P connector terminal No. 1 and body ground.
EVAP CANISTER PURGE
VALVE 2P CONNECTOR
PCS (RED/YEL)
Wire side of female terminals
Is there continuity?
YES Go to step 8.
NO Repair open in the wire between the EVAP
canister purge valve and the PCM (E11).
(cont'd)
11-287