Subaru Impreza 2003 Service Manual page 3063

4. CHECK TRANSMISSION CONTROL MODULE (TCM)
Step
1 CHECK TCM SIGNAL.
1)Lift-up the vehicle and support it with safety
stands.
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
(B56) No. 17 (+) — Chassis ground ( − − − − ):
2 CHECK HARNESS BETWEEN TCM AND
COMBINATION METER.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from TCM and
combination meter.
3)Measure the resistance between TCM har-
ness connector and combination meter har-
ness connector.
Connector & terminal
(B56) No. 17 — (i11) No. 2:
COMBINATION METER SYSTEM
Is the voltage less than 1 V
←→ more than 5 V?
Is the resistance less than 10
Ω?
IDI-7
INSTRUMENTATION/DRIVER INFO
Check
Go to step 2.
Check the speed
meter. <Ref. to
IDI-18,
REMOVAL,
Speedometer.>
Yes No
Check the TCM.
<Ref. to 4AT-2,
Basic Diagnostic
Procedure.>
Repair the wiring
harness.