Subaru Legacy 2003 Service Manual page 2421

DIAGNOSTIC PROCEDURE FOR NO-DIAGNOSTIC TROUBLE CODE (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
8 CHECK HARNESS CONNECTOR BETWEEN
TCM AND COMBINATION METER.
Measure resistance of harness connector TCM
and combination meter.
Connector & terminal
Except 3.0 L model and TURBO model:
(B55) No. 16 — (i12) No. 2:
3.0 L model and TURBO model:
(B55) No. 16 — (i10) No. 12:
Is the measured value less than the specified
value?
9 CHECK HARNESS CONNECTOR BETWEEN
TCM AND HOLD SWITCH.
Measure resistance of harness connector
between TCM and chassis ground to make
sure that circuit does not short.
Connector & terminal
(B55) No. 16 — Chassis ground:
Does the measured value exceed the specified
value?
10 CHECK INPUT SIGNAL FOR TCM.
1) Connect connectors to TCM and hold
switch.
2) Turn ignition switch ON (with engine OFF).
3) Measure signal voltage for TCM while turn-
ing hold switch OFF.
Connector & terminal
(B55) No. 16 (+) — Chassis ground (–):
Does the measured value exceed the spec-
ified value?
11 CHECK INPUT SIGNAL FOR TCM.
Measure signal voltage for TCM while turning
hold switch ON.
Connector & terminal
(B55) No. 16 (+) — Chassis ground (–):
Is the measured value less than the specified
value?
12 CHECK POOR CONTACT.
Is there poor contact?
Step Value
1 Ω
1 MΩ
8 V
1 V
There is poor contact.
AT-146
Yes
Go to step 9. Repair open circuit
in harness
between TCM and
combination
meter, and poor
contact in cou-
pling connector.
Go to step 10. Repair short circuit
in harness
between TCM,
hold switch and
combination meter
connector.
Go to step 11. Replace TCM.
<Ref. to AT-76,
Transmission Con-
trol Module
(TCM).>
Go to step 12. 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
or connector in
hold switch circuit.
No