Honda CR-V 1997 Service Manual page 416

Emission Control System
Evaporative Emission (EVAP) Controls (cont'd)
I
P1456
I
(cont'd)
('98 model only)
I - -- ---- --- - -- -- -- -- -- -- -- ---- -- ---- -- -- . - -- --.- --- - -- --
Fuel tank pressure sensor tnt.
(The continuation of
OTe
P1456
troub'nhooting.)
A 132
VV
,
~
Check the fuel tank pressure sen-
sor:
1-
Remove the fuel fill cap.
2. Turn the ignition switch ON
{II).
3. Monitor the FTP Sensor volt-
age
with the Honda PGM
Tester , or measure voltage
between ECMIPCM connecto r
terminals A29 and C1B.
Check the vacuum lines for
"-
NO
restriction or blockage repair .s
Is there approx. 2.5 V?
/ '
necessary.
tf
OK. replace the fuel
YES
tank pressure sensor.
Check the fuel tank pressure sen-
sor:
1.
Turn the ignition switch OFF.
2_
Disconnect the hose between
the EVAP two way valve and
the fuel tank pressure sensor at
the EVAP two way valve end.
3_
Connect a va cuum pump to
the open end of that hose.
4.
Turn the ignition switch ON
(II) .
5.
Monitor the FTP Sensor volt-
age with the Honda
PGM
Tester, or measure voltage
between ECMIPCM connector
terminals A29 and C1a, and
carefully apply vacuum on the
hose one stroke at a time.
VACUUM
6. The voltage should smoothly
PUMP/GAUGE, 0 - 30 in.
drop from the starting approx.
A973X - 41 -
2.5 V down to approx. 1.5 V.
XXXXX
Stop applying vacuum when
the voltage drops to approx.
1.5 V or damage to the fuel
tank pressure sensor may
occur.
Fuel tank pressure sensor is OK.
Does the voltage drop to approx.
YES
Do tha EVAP purge control
1.5 V and hold?
solenoid vatv. test (see P'l98 11-
215).
NO
Replace the fuel tank pressure
se ... sor.
11-214
- -- .-- -- - r
ECM/PCM CONNECTORS
SG2 (GRN/BLK)
Wire side of female terminals
FUEL TANK
PRESSURE
SENSOR
EVAPTWO
WAY VALVE