Subaru 2003 LEGACY Service Manual page 159

DIAGNOSTIC PROCEDURE FOR NO-DIAGNOSTIC TROUBLE CODE (DTC)
Step
1 CHECK SPORT SHIFT INDICATOR.
Does SPORT shift indicator operate normally
when driving in SPORT shift mode?
2 CHECK COMBINATION METER.
Do meters and indicators other than SPORT
shift indicator operate normally?
3 CHECK HARNESS CONNECTOR BETWEEN
TCM AND COMBINATION METER.
1) Turn ignition switch to OFF.
2) Disconnect connector from TCM and com-
bination meter.
3) Measure resistance of harness between
TCM and combination meter.
Connector & terminal
(B56) No. 3 — (i10) No. 2:
(B56) No. 4 — (i10) No. 1:
(B56) No. 12 — (i10) No. 4:
(B56) No. 13 — (i10) No. 3:
Is the measured value less than the speci-
fied value?
4 CHECK HARNESS CONNECTOR BETWEEN
TCM AND COMBINATION METER.
Measure resistance between TCM and chassis
ground.
Connector & terminal
(B56) No. 3 — Chassis ground:
(B56) No. 4 — Chassis ground:
(B56) No. 12 — Chassis ground:
(B56) No. 13 — Chassis ground:
Does the measured value exceed the spec-
ified value?
5 CHECK OUTPUT SIGNAL EMITTED FROM
TCM.
1) Connect connector to TCM and combina-
tion meter.
2) Turn ignition switch to ON. (Engine is
stopped.)
3) Measure voltage between TCM and chas-
sis ground.
Connector & terminal
(B56) No. 3 (+) — Chassis ground (–):
(B56) No. 4 (+) — Chassis ground (–):
(B56) No. 12 (+) — Chassis ground (–):
(B56) No. 13 (+) — Chassis ground (–):
Does the measured value exceed the spec-
ified value?
6 CHECK POOR CONTACT.
Is there poor contact in SPORT shift indicator
circuit?
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Value
SPORT shift indicator operates
normally.
Combination meter operates
normally.
1 Ω
1 MΩ
4 V
There is poor contact.
AT-157
Yes
<Ref. to AT-158, Go to step 2.
CHECK BUZZER.,
Diagnostic Proce-
dure for No-diag-
nostic Trouble
Code (DTC).>
Go to step 3. Check combina-
tion meter.
Go to step 4. Repair open circuit
in harness
between TCM and
combination meter
connector and
poor contact in
coupling connec-
tor.
Go to step 5. Repair short circuit
in harness
between TCM and
combination meter
connector.
Go to step 6. Replace combina-
tion meter.
Repair poor con- Replace TCM.
tact.
No