Honda Civic Service Manual page 379

EVAP System
DTC Troubleshooting (cont'd)
DTC P0452: FTP Sensor Circuit Low Voltage
1. Check the vacuum lines at the FTP sensor for
misrouting, leakage. breakage, or clogging.
Are the vacuum lines OK?
YES Go to step 2.
NO Repair or replace vacuum lines as
necessary. I
2 . R e s e t t h e E C M ( s e e p a g e 1 1 - 4 ) .
3 . R e m o v e t h e f u e l f i l l c a p .
4. Turn the ignition switch ON (ll)
5. Monitor FTP sensor voltage with the Honda PGM
Tester, or measure voltage between body ground
and ECM connector terminal E14.
ECM CONNECTOR E 131PI
1 2 t 3 t 4
5
o /
8 9
. / . / 1 1 4
t c
61./18
2C
21
22123
241 t
26 271/ 29 31
TP (LT GRN)
Wire side of female terminals
ls thete about 2.5 V?
YES- Intermittent failure, system is OK at this time.
Check for poor connections or loose terminals at
the FTP sensor and at the ECrM.l
NO Go to step 6.
11-172
6. Turn the ignition switch OFF.
7 . R e i n s t a l l t h e f u e l f i l l c a p .
8. Disconnect the FTP sensor 3P connector.
9. Turn the ignition switch ON (ll)
10. Measure voltage between FTP sensor 3P connector
t e r m i n a l s N o . 1 a n d N o . 2 .
FUEL TANK PRESSURE SENSOR 3P CONNECTOR
VCgl {YEL/BLU}
Wire side of female terminals
ls there about 5 V?
YES Go to step 1
'1.
NO-Repair open in the wire between the FTP
s e n s o r a n d t h e E C M { E 5 ) . 1