Subaru IMPREZA GD 2007 Series Manual page 323

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
1 CHECK OPERATION OF SPEEDOMETER
AND TACHOMETER.
2 CHECK INPUT SIGNAL OF ECM.
1) Turn the ignition switch to ON. (engine OFF)
2) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B135) No. 10 (+) — Chassis ground (–):
3 CHECK INPUT SIGNAL OF ECM (USING
SUBARU SELECT MONITOR).
Read the data of fuel level sensor signal using
Subaru Select Monitor.
NOTE:
For detailed operation procedures, refer to
"READ CURRENT DATA FOR ENGINE". <Ref.
to EN(H4SO)(diag)-32, Subaru Select Monitor.>
4 CHECK INPUT VOLTAGE OF ECM.
1) Turn the ignition switch to OFF.
2) Disconnect the fuel tank cord connector
(R57) from the rear wiring harness connector
(R15).
3) Turn the ignition switch to ON.
4) Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B135) No. 10 (+) — Chassis ground (–):
5 CHECK HARNESS BETWEEN ECM AND
COMBINATION METER.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the ECM
and combination meter connector (i12).
3) Measure the resistance between ECM and
chassis ground.
Connector & terminal
(B135) No. 10 — Chassis ground:
Check
Are speedometer and tachom-
eter operate normally?
Is the voltage less than 0.04 V? Go to step 4.
Does the voltage change by
shaking the harness and con-
nector of ECM?
Is the voltage less than 0.04 V? Go to step 5.
Is the resistance 1 MΩ or
more?
EN(H4SO)(diag)-214
Yes No
Go to step 2. Repair or replace
the combination
meter. <Ref. to IDI-
3, Combination
Meter System.>
Go to step 3.
Repair poor con- Even if the malfunc-
tact of the ECM tion indicator light
connector. illuminates, the cir-
cuit has returned to
a normal condition
at this time. Repro-
duce the fault con-
dition, and
reperform the
check.
NOTE:
In this case, there
may be a tempo-
rary connector
contact failure.
Go to step 6.
Repair or replace Repair the har-
the combination ness.
meter. <Ref. to IDI-
NOTE:
3, Combination
In this case, repair
Meter System.>
the following item:
• Short circuit of
the harness to
ground between
the ECM and com-
bination meter
connector.
• Short circuit of
the harness to
ground between
the ECM and fuel
tank cord connec-
tor.