Honda 2004 Odyssey Service Manual page 605

EVAP System
DTC Troubleshooting (cont'd)
33. Monitor the voltage for 20 seconds.
Does the voltage drop to 1.5 V and hold f or at
least 20 seconds?
YES Inspect the EVAP canister vent shut valve
line and connections.
NO Go to step 34.
34. Turn the ignition switch OFF.
35. Disconnect the fuel tank vapor vent tube (A) from
the canister at the metal line, and plug the hose (B).
B
36. Turn the ignition switch ON (II).
37. While monitoring FTP sensor voltage with the HDS,
or measuring voltage between PCM connector
terminals A29 and C18, slowly pump the vacuum
pump every 1 2 seconds.
38. Continue to pump vacuum until the voltage drops
to about 1.5 V. Make sure that the engine coolant
temperature is still above 95°F (35°C) and your
vacuum pump does not have a leak.
39. Monitor the voltage for 20 seconds.
Does the voltage drop to 1.5 V and hold f or at
least 20 seconds?
YES Check the fuel tank vapor control line and
connections for misrouting, poor connections,
damage, or pinched areas. If the line and
connections are OK, replace the fuel tank vapor
control valve.
NO Go to step 40.
11-296
40. Turn the ignition switch OFF.
41. Disconnect the purge line hose (A) from the
B
A
42. Turn the ignition switch ON (II).
43. While monitoring FTP sensor voltage with the HDS,
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44. Continue to pump vacuum until the voltage drops
45.
canister at the metal line, and plug the hose (B).
A
or while measuring voltage between PCM
connector terminals A29 and C18, slowly pump the
vacuum pump every 1 2 seconds.
to about 1.5 V. Make sure that the engine coolant
temperature is still above 95°F (35°C) and your
vacuum pump does not have a leak.
Monitor the voltage for 20 seconds.
Does the voltage drop to 1.5 V and hold f or at
least 20 seconds?
YES Inspect the EVAP canister purge valve line
and connections. If they are OK, do the EVAP two
way valve test (see page 11-297). It the line, the
connections, and the EVAP two way valve are OK,
replace the EVAP canister purge valve.
NO Replace the EVAP canister.
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