Subaru IMPREZA GD 2007 Series Manual page 1559

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ENGINE (DIAGNOSTICS)
Step
1 CHECK SPEEDOMETER AND TACHOME-
TER OPERATION IN COMBINATION METER.
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 FOR 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(STI)(diag)-33, Subaru Select Monitor.>
4 CHECK INPUT VOLTAGE OF ECM.
1) Turn the ignition switch to OFF.
2) Disconnect the fuel tank cord connector
(R57) and 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:
6 CHECK FUEL TANK CORD.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from fuel sub
level sensor.
3) Measure the resistance between the fuel
sub level sensor and chassis ground.
Connector & terminal
(R59) No. 1 — Chassis ground:
Check
Does the speedometer and
tachometer operate normally?
Is the voltage less than 0.04 V? Go to step 4.
Does the voltage change by
shaking the ECM harness and
connector?
Is the voltage less than 0.04 V? Go to step 5.
Is the resistance 1 MΩ or more? Repair or replace
Is the resistance 1 MΩ or more? Go to step 7.
EN(STI)(diag)-228
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 the har-
the combination ness.
meter. <Ref. to IDI-
NOTE:
3, Combination
In this case, repair
Meter System.>
the following item:
• Ground short cir-
cuit of harness be-
tween ECM and
combination meter
connector
• Ground short cir-
cuit of harness be-
tween ECM and
fuel tank cord con-
nector
Repair the ground
short circuit in fuel
tank cord.