Honda 2004 Odyssey Service Manual page 595

EVAP System
DTC Troubleshooting (cont'd)
Canister System Leak Test
27. Turn the ignition switch OFF.
28. Connect 2 three-way T-fittings (A) into the hose
from the EVAP canister to the EVAP two way valve.
Connect the FTP sensor to one of the T-fittings and
the vacuum pump to the other.
A
29. Remove the vent hose from the EVAP canister vent
shut valve (A) and cap the port (B) to seal the fresh
air vent of the EVAP canister.
B
30. Turn the ignition switch ON (II).
31. While monitoring FTP sensor voltage with the HDS,
or while measuring voltage between PCM
connector terminals A29 and C18, slowly pump the
vacuum pump every 1 2 seconds.
32. 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.
11-286
A
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A
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XXXXX
33. Check 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 purge line, hose (A) from the
canister at the metal line, and plug the hose (B).
A
B
36. Turn the ignition switch ON (II).
37. While monitoring FTP sensor voltage with the HDS,
or while measuring voltage between PCM
connector terminals A29 and C18, slowly pump the
vacuum pump.
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 Inspect the EVAP purge control solenoid
valve line and connections. If they are OK, do the
EVAP two way valve test (see page 11-297).
NO Replace the EVAP canister.
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