Honda Civic Service Manual page 547

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'99 - 00 models excepi Dl6Y5 engine with M/T:
The scan tool indicates Diagnostic Trouble Code (DTC) P0452: A low voltage
problem in the Fuel Tank Pressure
sensor.
The fuel tank pressure sensor converts fuel tank absolute pressure into electrical
signals and inputs the ECM/PCM
OUTPUT
VOLTAGE
(vl
t.5
0.5
-7 kP.
(-g) mmHg,
-2 in.Hgl
+7 kP.
150 mmHg,
2 in.Hgl
PRESSURE
I
Wire side of lemale terminals
FUEL TANK
PRESSURE SENSOR
SUB.HARNESS
6P CONNECTOR (C574 (C568)rl
vcc2
(YEL/BLUI
sG2
{GRN/BLK}
Wire side o{ temale terminals
The MIL has been .eported on.
DTC P0452 is stored
Check the vacuum lines:
C h e c k t h e v a c u u m l i n e s o f t h e
fuel tank pressure sensor lor mis-
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
cloggrng.
Are the vacuum hnes OK?
Problem veritication:
1. Do the ECM/PCM Reset Proce-
du re,
2. Bemove the fuel fill caP.
3. Turn the ignition switch ON {ll)
4. Monitorthe FTP Sensor voltage
with the Honda PGM Tester' or
measure voltage between body
groLrnd and ECM/PCM connec_
tor terminalA29.
lntermitlent tailure, 3Ystem b OK
at this time. Check for Poor con'
nections or loose wire3 at C131
{located under right side of dash},
C401 {located above under'dash
tuse/relay box), C574 (C568)*
l l o c d t e d u n d e r a c c e s s P a n e l ) ,
C792 (tuel rank Prcssure sensorl
and ECM/PCM.
ls there approx.2 5 V?
Check for an open in wire {VCC2
line):
1. Turn the ignition switch OFF.
2. Reinstall the ltrel fill caP
3, Remove the access Panel from
the floor.
4. Disconnect the fuel tank Pres'
s u r e s e n s o r s u b - h a r n e s s 6 P
5. Turn the ignition switch ON (ll).
6. At the access Panel side, mea_
sure voltage between the fuel
tank Pressure sensor sub-nar-
ness 6P connector No 5termi
nal and No. 6 termlnal.
Repair open in tho wire between
th6 fu€l tank Prossuro sen3oa and
the ECM/PCM lc28).
l s t h e r e a p p r o x 5 V ?
ECM/PCM CONNECTOR A (32P)
PTANK {LT BLUI
I
l l
(To page '11-278)
(cont'd)