Honda Civic Service Manual page 381

EVAP System
DTC Troubleshooting (cont'dl
6. Turn the ignition switch OFF.
7 . R e i n s t a l l l h e f u e l f i l l c a p .
8. Disconnect the FTP sensor 3P connector.
9 . 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 ) .
'10.
l\4easure voltage between FTP sensor 3P connector
t e r m i n a l s N o . 1 a n d N o . 2 .
FTP SENSOR 3P CONNECTOR
VCC3 (YEL/BLU)
Wire side of female terminals
ls there about 5 V?
Y E S G o t o s t e p 1 1 .
NO-Repair open in the wire between the FTP
sensor and the ECM (E4). !
11-174
11, Measure voltage between FTP sensor 3P connector
t e r m i n a l s N o . 2 a n d N o . 3 .
FTP SENSOR 3P CONNECTOR
FTP ILT GRN}
Wire side of female terminals
ls there about 5 V?
YES Replace the FTP sensor.l
NO Go to step 12.
l\4easure voltage between ECM connector
t e r m i n a l s E 4 a n d E 1 4 ,
ECM CONNECTOR E (31P)
W i r e s i d e o f f e m a l e t e r m i n a l s
ls there about 5 V?
YES Repair open in the wire between the FTP
s e n s o r a n d t h e E C M ( E 1 4 ) . I
NO Update the ECM if it does not have the latest
software, or substitute a known-good ECN4. then
recheck (see page 11-6). lf the symptom/indication
goes away with a known-good ECM, replace the
o r i g i n a l E C M . I
\