Honda Civic Service Manual page 391

EVAP System
DTC Troubleshooting (cont'dl
31. While monitoring FTP sensor voltage with the
Honda PGM Tester, or measuring voltage between
ECM connector terminals E4 and E14, slowly pump
the vacuum oumD.
ECM CONNECTOR E 13lPI
Wire side ot female terminals
32. Continue to pump vacuum until the voltage drops
to about 1.5 V. Make sure the engine coolant
temperature is still above 95'F 135.C) and your
v a c u u m p u m p h a s n o l e a k .
33. Monitor the voltage for 20 seconds.
Does the voltage drop 1.5V and hold for at least
20 seconds?
YES Inspect the EVAP canister vent shut valve
l i n e a n d c o n n e c t i o n s . l
NO-Go to step 34.
34. Turn the ignition switch OFF.
35. Discon nect the quick-con nect fitting (A) fromthe
EVAP canister, and plug the canister port {B).
3 6 . T u r n t h e i g n i t i o n s w i t c h O N ( l l ) .
1 1 - 1 8 4
4 2 . T u r n t h e i g n i t i o n s w i t c h O N ( l l ) .
I
38.
39.
37. While monitoring FTP sensor voltage with the
Honda PGM Tester, or measuring voltage between
E C M c o n n e c t o r t e r m i n a l s E 4 a n d E 1 4 , s l o w l y p u m p
t h e v a c u u m p u m p .
ECM CONNECTOR E {31PI
Wire side of lemale terminals
Continue to pump vacuum until the voltage drops
to about 1.5V. Make sure the engine coolant
temperature is still above 95"F (35"C) and your
vacuum pump has no leak.
Monitor the voltage for 20 seconds
Does the voltage hold for at least 20 seconds?
YES Inspecl the fuel tank vapor control lineand
c o n n e c t i o n s . I
NO Go to step 40.
T u r n t h e i g n i t i o n s w i t c h O F F .
Disconnect the purge line hose {A) from the
c a n i s t e r a t t h e m e t a l l i n e a n d p l u g t h e h o s e ( B ) .
40.
4 1 .