Subaru IMPREZA GD 2007 Series Manual page 326

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
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 ECM and combination
meter connector (i12).
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
FUEL TANK CORD.
1) Turn the ignition switch to OFF.
2) Disconnect the fuel tank cord connector
(R57) from the rear wiring harness connector
(R15).
3) Measure the resistance between ECM and
fuel tank cord.
Connector & terminal
(B135) No. 10 — (R15) No. 7:
6 CHECK HARNESS BETWEEN FUEL TANK
CORD AND CHASSIS GROUND.
Measure the resistance between fuel tank cord
and chassis ground.
Connector & terminal
(R15) No. 11 — Chassis ground:
Check
Are speedometer and tachom-
eter operate normally?
Is the voltage 4.9 V or more?
Does the voltage change by
shaking the harness and con-
nector of ECM?
Is the voltage 4.9 V or more?
Is the resistance less than 1 Ω? Go to step 6.
Is the resistance less than 5 Ω? Go to step 7.
EN(H4SO)(diag)-217
ENGINE (DIAGNOSTICS)
Yes No
Go to step 2. Repair or replace
the combination
meter. <Ref. to IDI-
3, Combination
Meter System.>
Go to step 4. 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 5.
Repair the short
circuit to power of
harness between
ECM and combi-
nation meter con-
nector.
Repair the open
circuit between
ECM and fuel tank
cord.
Repair the harness
and connector.
NOTE:
In this case, repair
the following item:
• Open circuit of
harness between
fuel tank cord and
chassis ground
• Poor contact of
coupling connector