Dtc P0452: Ftp Sensor Circuit Low Voltage - Honda S2000 Service Manual

EVAP System
DTC Troubleshooting (cont'dl
DTC P0452: FTP Sensor Circuit Low Voltage
1. Check the vacuum lines of the FTP sensor for
m i s r o u t i n g , l e a k a g e , b r e a k a g e , a n d c l o g g i n g .
Arc the vacuum lines OK?
YES Go to step 2.
N O R e p a i r o r r e p l a c e v a c u u m l i n e s a s
necessary.I
2. Reset the ECM (see page 11-4)
3 . R e m o v e t h e f u e l f i l l c a P .
4 . 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 ) .
5. Monitor FTP sensor voltage with the Honda PGM
Tester. or measure voltage between body ground
and EClvl connector terminal A29.
ECM CONNECTOR A {32P)
2
3
6
9
t 0
1 5 1T
1 a
1 9
m
21
6
26
n a
29 30 32
PTANK (LT GRN)
Wire side of female terminals
ls there about 2.5 V?
YES Intermittent failure, system is OK at this time.
Check for poor connections or Ioose terminals at
t h e F T P s e n s o r a n d a t t h e E C M . I
NO Go to step 6.
11-132
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 . 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. 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
FTP SENSOR 3P CONNECTOR
VCC2 {YEL/BLU)
Wire side of female terminals
Is there about 5 V?
YES Go to step 1
'1.
NO - Repair open in the wire between the FTP
sensor and the ECM (C28).4