Subaru IMPREZA 2002 Service Manual page 531

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
~~
Step
CHECK CURRENT DATA.
1)Turn the ignition switch to OFF.
2)Remove the fuel filler cap.
3)lnstall the fuel filler cap.
4)Turn the ignition switch to ON.
5)Read the data of fuel tank pressure sensor
signal using Subaru Select Monitor or the
OBD-ll general scan
tool.
NOTE:
Gubaru Select Monitor
For detailed operation procedure, refer to the
"READ CURRENT DATA FOR ENGINE. <Ref.
to EN(S0HC)-32, Subaru Select Monitor.>
*OBD-ll general scan tool
For detailed operation procedures, refer to the
OBD-II General Scan Tool Instruction Manual.
CHECK POWER SUPPLY TO FUEL TANK
PRESSURE SENSOR.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(8136) No. 15 (+)
-
Chassis ground ( - ) :
CHECK POWER SUPPLY TO FUEL TANK
PRESSURE SENSOR.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(6136) No. 15 (+)
-
Chassis ground (-):
CHECK INPUT SIGNAL FOR ECM.
Measure the voltage between ECM and chas-
sis ground.
Connector & terminal
(6136) No. 12 (+)
-
Chassis ground ( - ) :
CHECK INPUT SIGNAL FOR ECM. (USING
SUBARU SELECT MONITOR.)
Read the data of fuel tank pressure sensor sig.
nal using Subaru Select Monitor.
NOTE:
*Subaru Select Monitor
For detailed operation procedure, refer to the
"READ CURRENT DATA FOR ENGINE. <Ref.
to EN(S0HC)-32, Subaru Select Monitor.>
CHECK HARNESS BETWEEN ECM AND
COUPLING CONNECTOR IN REAR WIRING
HARNESS.
1)Turn the ignition switch to OFF.
2)Remove the rear seat cushion (Sedan) or
move rear seat cushion (Wagon).
3)Separate rear wiring harness and fuel tank
cord.
4)Turn the ignition switch to ON.
5)Measure the voltage between rear wiring
harness connector and chassis ground.
.
Connector & terminal
(R15) No. 9 (+)
-
Chassis ground ( - ) :
Check
;the value less than -2.8 kPa
-21 .O
mmHg, -0.827 inHg)?
;
the voltage more than 4.5 VI;
)oes the voltage change more
ian 4.5 V by shaking harness
.nd connector of ECM while
ionitoring the value with volt-
.ge meter?
j
the voltage less than 0.2 V?
)oes the value change more
Ian -2.8 kPa (-21 .O mmHg,
.0.827 inHg) by shaking har-
less and connector of ECM
vhile monitoring the value with
;ubaru Select Monitor?
s
the voltage more than 4.5 VI
Yes
io to step 2.
;o to step 4.
Iepair poor con-
act in ECM con-
lector.
20 to step 6.
3epair poor con-
act in ECM con-
lector.
30 to step 7.
No
Even if MIL lights
JP, the circuit has
,eturned to a nor-
nal condition at
:his time.
30 to step 3.
Sontact with SOA
(distributor) ser-
wice.
NOTE:
Inspection by DTh
is required, be
cause probablc
cause is deteriora
tion of multiplt
parts.
Go to step 5.
Go to step 6.
Repair harness
and connector.
NOTE:
In this case, repai
the following:
Open circuit in
harness between
ECM and rear wir.
ing harness con-
nector (R57)
Poor contact in
coupling connect0
0398)
EN(S0HC)-207