Subaru 2002 IMPREZA Service Manual page 447

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 OBD-ll
general scan tool.
NOTE:
4ubaru Select Monitor
For detailed operation procedure, refer to the
"READ CURRENT DATA FOR ENGINE". <Ref.
to EN(D0HC TURBO)-38, Subaru Select Mon.
itor.>
*OBD-ll general scan tool
For detailed operation procedures, refer to the
OBD-ll General Scan Tool Instruction Manual.
CHECK POWER SUPPLY TO FUEL TANK
PRESSURE SENSOR.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(8135) No. 9 (+)
-
Chassis ground (-):
CHECK POWER SUPPLY TO FUEL TANK
PRESSURE SENSOR.
Measure the voltage between ECM connector
and chassis ground.
Connector & terminal
(8135) No. 9 (+)
-
Chassis ground ( - ) :
CHECK INPUT SIGNAL FOR ECM.
Measure the voltage between ECM and chas-
sis ground.
Connector & terminal
(8135) No. 15 (+)
-
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:
Gubaru Select Monitor
For detailed operation procedure, refer to the
"READ CURRENT DATA FOR ENGINE". <Ref.
to EN(D0HC TURBO)-38, Subaru Select Mon
itor.>
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
s
the value more than 2.8 kPa
21 .O mmHg, 0.827 inHg)?
s the voltage more than 4.5 V?
Does the voltage change more
;han 4.5 V by shaking harness
and connector of ECM while
nonitoring the value with volt-
3ge meter?
Is the voltage less than 0.2 V?
Does the value change more
than -2.8 kPa (-21 .O mmHg,
-0.827 inHg) by shaking har-
ness and connector of ECM
while monitoring the value with
Subaru Select Monitor?
Is the voltage more than 4.5 V S
Yes
20
to step 12.
30
to step 4.
3epair poor con-
act in ECM con-
lector.
20 to step 6.
3epair poor con-
:act in ECM con-
lector.
30 to step 7.
No
30 to step 2.
30 to step 3 .
Replace the ECM.
<Ref. to FU(D0HC
Engine Control
Module.>
TURBO)-47,
So to step 5.
So to step 6.
Repair harness
and connector.
NOTE:
In this case, repai
the following:
a
Open circuit in
harness between
ECM and rear wir.
ing harness con-
nector
Poor contact in
coupling connectc
EN(D0HC TURBO)-223