Subaru IMPREZA GD 2007 Series Manual page 3969

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INSTRUMENTATION/DRIVER INFO
4. CHECK TRANSMISSION CONTROL MODULE (TCM)
Step
1 CHECK TCM SIGNAL.
1) Lift up the vehicle.
2) Drive the vehicle faster than 10 km/h (6
MPH).
WARNING:
Be careful not to get caught in the running
wheels.
3) Measure the voltage between TCM connec-
tor and chassis ground.
Connector & terminal
(B55) No. 21 (+) — Chassis ground (–):
2 CHECK THE HARNESS BETWEEN TCM
AND COMBINATION METER.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from TCM and
combination meter.
3) Measure the resistance between TCM har-
ness connector and combination meter harness
connector.
Connector & terminal
(B55) No. 21 — (i11) No. 2:
5. CHECK ENGINE CONTROL MODULE (ECM)
Step
1 CHECK ECM SIGNAL.
1) Start the engine.
2) Measure the voltage between ECM connec-
tor and engine ground.
Connector & terminal
(B136) No. 22 (+) — Chassis ground (–):
2 CHECK HARNESS BETWEEN COMBINA-
TION METER AND ECM.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM and
combination meter.
3) Measure the resistance between ECM har-
ness connector and combination meter harness
connector.
Connector & terminal
(B136) No. 22 — (i11) No. 5:
Combination Meter System
Check
Is the voltage less than 1 V ←→
5 V or more?
Is the resistance less than 10 Ω? Check the speed-
Check
Is the voltage 0 ←→ 14 V or
more?
Is the resistance less than 10 Ω? Except for STI
IDI-6
Yes No
Go to step 2. Check the TCM.
<Ref. to
4AT(D)(diag)-2,
Basic Diagnostic
Procedure.>
Repair the wiring
ometer. <Ref. to harness.
IDI-15, REMOVAL,
Speedometer.>
Yes No
Go to step 2. Inspect the ECM.
<Ref. to
EN(H4SO)(diag)-
2, Basic Diagnostic
Procedure.> or
<Ref. to
EN(H4DOTC)(diag
)-2, Basic Diagnos-
tic Procedure.> or
refer to "EN(STI)
Section".
Repair the wiring
model: Check the harness.
tachometer. <Ref.
to IDI-16,
REMOVAL,
Tachometer.> STI
model: Replace
the meter main
assembly.