Subaru Legacy 2003 Service Manual page 2310

DIAGNOSTIC PROCEDURE FOR POWER INDICATOR LIGHT
Step
1 CHECK BATTERY TERMINAL.
Turn ignition switch to OFF.
Is there poor contact at battery terminal?
2 CHECK POWER SUPPLY OF TCM.
1) Disconnect connector from TCM.
2) Turn ignition switch to ON.
3) Measure voltage between TCM connector
and chassis ground.
Connector & terminal
(B56) No. 1 (+) — Chassis ground ( − − − − ):
Is the measured value within the specified
range?
3 CHECK FUSE (NO. 4).
Remove fuse (No. 4).
Is the fuse (No. 4) blown out?
4 CHECK IGNITION POWER SUPPLY CIR-
CUIT.
1) Turn ignition switch to ON (engine OFF).
2) Measure ignition power supply voltage
between TCM connector and chassis
ground.
Connector & terminal
(B54) No. 23 (+) — Chassis ground (–):
(B54) No. 24 (+) — Chassis ground (–):
Does the measured value exceed the spec-
ified value?
5 CHECK FUSE (NO. 11).
Remove fuse (No. 11).
Is the fuse (No. 11) blown out?
6 CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
1) Turn ignition switch to OFF.
2) Disconnect connector from TCM and trans-
mission.
3) Measure resistance of harness between
TCM and transmission connector.
Connector & terminal
(B56) No. 19 — (B11) No. 16:
(B54) No. 21 — (B11) No. 16:
Is the measured value less than the speci-
fied value?
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Value
There is poor contact.
10 — 15 V
Fuse is blown.
10 V
Fuse is blown.
1 Ω
AT-35
Yes
Repair battery ter- Go to step 6.
minal.
Go to step 4. Go to step 3.
Replace fuse (No. Repair open circuit
4). If replaced fuse in harness
(No. 4) has blown between fuse (No.
out easily, repair 4) and TCM, or
short circuit in har- fuse (No. 4) and
ness between fuse battery, and poor
(No. 4) and TCM. contact in cou-
pling connector.
Go to step 6. Go to step 5.
Replace fuse (No. Repair open circuit
11). If replaced in harness
fuse (No. 11) has between fuse (No.
blown out easily, 11) and TCM, or
repair short circuit fuse (No. 11) and
in harness battery, and poor
between fuse (No. contact in cou-
11) and TCM. pling connector.
Go to step 7. Repair open circuit
in harness
between TCM and
transmission har-
ness connector,
and poor contact
in coupling con-
nector.
No