Subaru Legacy 2003 Service Manual page 2405

DIAGNOSTIC PROCEDURE FOR NO-DIAGNOSTIC TROUBLE CODE (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
8 CHECK HARNESS CONNECTOR BETWEEN
TCM AND POWER SWITCH.
Measure resistance of harness connector
between TCM and chassis ground.
Connector & terminal
(B55) No. 23 — Chassis ground:
Does the measured value exceed the specified
value?
9 CHECK INPUT SIGNAL FOR TCM.
1) Connect connectors to TCM and power
switch.
2) Turn ignition switch ON (with engine OFF).
3) Measure signal voltage for TCM while turn-
ing power switch OFF.
Connector & terminal
(B55) No. 23 (+) — Chassis ground (–):
Does the measured value exceed the spec-
ified value?
10 CHECK INPUT SIGNAL FOR TCM.
Measure signal voltage for TCM while turning
power switch ON.
Connector & terminal
(B55) No. 23 (+) — Chassis ground (–):
Is the measured value less than the specified
value?
11 CHECK POOR CONTACT.
Is there poor contact?
Step Value
1 MΩ
10 V
1 V
There is poor contact.
AT-130
Yes
Go to step 9. Repair short circuit
in harness
between TCM and
power switch con-
nector.
Go to step 10. Replace TCM.
<Ref. to AT-76,
Transmission Con-
trol Module
(TCM).>
Go to step 11. Replace TCM.
<Ref. to AT-76,
Transmission Con-
trol Module
(TCM).>
Repair poor con- A temporary poor
tact. contact of the con-
nector or harness
in power switch
circuit.
No