Subaru IMPREZA 2002 Service Manual page 545

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
Step
CHECK INPUT SIGNAL FOR ECM.
1)Turn the ignition switch to ON. (Engine OFF)
2)Measure the voltage between ECM connec-
tor and chassis ground.
Connector & terminal
(6136) No. 27 (+)
-
Chassis ground (-):
CHECK INPUT SIGNAL FOR ECM. (USING
SUBARU SELECT MONITOR.)
Read the data of fuel level sensor signal 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.>
1
CHECK INPUT VOLTAGE OF ECM.
1)Turn the ignition switch to OFF.
2)Separate fuel tank cord connector (R57) and
rear wiring harness connector (R15).
3)Turn the ignition switch to ON.
4)Measure the voltage of harness between
ECM connector and chassis ground.
Connector & terminal
(8136)
No.
27 (+)
-
Chassis ground (-):
1
CHECK HARNESS BETWEEN ECM AND
COMBINATION METER.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from connector
(il0) and ECM connector.
3)Measure the resistance between ECM and
chassis ground.
Connector & terminal
(6136)
No.
27
-
Chassis ground:
CHECK HARNESS BETWEEN ECM AND
COMBINATION METER.
Measure the resistance between ECM and
combination meter connector.
i
Connector & terminal
(8136)
No.
27
-
(i12)
No.
2:
Check
;
the voltage less than 0.1 2
,?
Ioes the value change less
Ian 0.12 V by shaking har-
ess and connector of ECM
rhile monitoring the value with
iubaru Select Monitor?
s the voltage more than 0.12
'?
s the resistance more than 1
A n ?
s the resistance less than 10
L?
Yes
i o
to step 6.
iepair poor con-
3ct in ECM con-
lector.
so to step
4.
; o to step 6.
3epair or replace
he combination
neter. <Ref. to
DI-4, Combina-
ion Meter Sys-
em.>
No
30 to step
3.
Even if MIL lights
JP, the circuit has
,eturned to a nor-
nal condition at
:his time. A tempo,
ary poor contact
3f
the connector
nay be the cause.
VOTE:
In this case, repai
the following:
b
Poor contact in
:ombination meter
:onnector
Poor contact in
ECM connector
Poor contact in
coupling connec-
tors (B99 and R57
Go to step 7.
Repair ground
short circuit in har
ness between
ECM and combi-
nation meter con-
nector.
Repair open circui
between ECM anc
combination mete
connector.
NOTE:
In this case, repa
the following:
Poor contact in
coupling connect0
02)
EN( SOHC)-221