Subaru IMPREZA 2002 Service Manual page 535

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:
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-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
(8136) No. 15 (+)
-
Chassis ground (-):
I
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 INPUT SIGNAL FOR ECM.
Measure the voltage between ECM and chas-
sis ground.
I
Connector & terminal
(8136) No. 1 2 (+)
-
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.
k
i
Check
Is the value more than 2.8 kPa
(21
.O
mmHg, 0.827 inHg)?
Is the voltage more than 4.5 V?
Does the voltage change more
than 4.5 V by shaking harness
and connector of ECM while
monitoring the value with volt-
age meter?
I s 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?
Yes
; o to step 12.
30 to step 4.
3epair poor con-
act in ECM con-
lector.
30 to step 6.
3epair poor con-
act in ECM con-
lector.
30 to step 7.
No
30 to step 2.
30 to step 3.
3eplace the ECM.
:Ref. to
Engine Control
Module.>
W(SOHC)-47,
30 to step 5.
30 to step 6.
3epair harness
and connector.
\IOTE:
n this case, repaii
:he following:
1
Open circuit in
iarness between
ECM and rear wir-
ng harness con-
lector (R57)
1
Poor contact in
:oupling connectoi
:B98)
EN(S0HC)-211