Honda 2004 Odyssey Service Manual page 591

EVAP System
DTC Troubleshooting (cont'd)
Vacuum Hoses and Connections Test
30. Do the fuel tank vapor control valve test (see page
11-298).
Is the f uel tank vapor control valve OK ?
YES Go to step 31.
NO Replace the fuel tank vapor control valve.
31. Tighten the fuel cap 3 ''clicks'', then monitor the
fuel tank pressure readings with the HDS.
32. Start the engine. Let the engine idle for 5 minutes.
33. Check the FTP sensor readings.
G
F
B
C
A
E
Is the reading above 0.5 kPa ( 0.16 in.Hg, 4 mmHg)
pressure or below
vacuum?
YES Substitute a known-good PCM and retest
(see page 11-5). If the symptom/indication goes
away, replace the original PCM.
NO Check these parts for leaks:
• Fuel tank (A)
• Fuel fill cap (B)
• Fuel fill pipe (C)
• Fuel tank vapor control valve (D)
• Fuel tank vapor recirculation valve (E)
• Fuel tank vapor recirculation tube (F)
• Fuel tank vapor signal tube (G)
• Fuel tank vapor vent tube (H)
• EVAP two way valve (I)
• FTP sensor (J)
– Repair or replace any leaking parts.
11-282 11-282
D H
J
I
0.5 kPa ( 0.16 in.Hg, 4 mmHg)
DTC P1457 '99-00 Models:
System 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.
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
one gallon of fresh fuel to the tank (as long as it will not
fill the tank), just before starting these procedures.
EVAP Purge Control Solenoid Valve Test
1. Disconnect the vacuum hose from the EVAP purge
control solenoid valve (A), and connect a vacuum
pump to the hose.
A
EVAP Control
A973X-
041-XXXXX