Subaru Legacy 2003 Service Manual page 2348

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
1 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 shift solenoid 1 connector.
Connector & terminal
(B54) No. 22 — (B11) No. 1:
Is the measured value less than the speci-
fied value?
2 CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
Measure resistance of harness between TCM
connector and chassis ground.
Connector & terminal
(B54) No. 22 — Chassis ground:
Does the measured value exceed the specified
value?
3 CHECK SHIFT SOLENOID 1.
Measure resistance between transmission
connector terminals.
Connector & terminal
(T4) No. 1 — No. 16:
Is the measured value within the specified
range?
4 CHECK OUTPUT SIGNAL EMITTED FROM
TCM.
1) Connect connectors to TCM and transmis-
sion.
2) Turn ignition switch to ON (engine OFF).
3) Move select lever to "D" range.
4) Measure voltage between TCM connector
and chassis ground.
Connector & terminal
(B54) No. 22 (+) — Chassis ground ( − − − − ):
Does the measured value exceed the spec-
ified value?
5 CHECK OUTPUT SIGNAL EMITTED FROM
TCM.
1) Hold switch to ON.
2) Measure voltage between TCM connector
and chassis ground.
Connector & terminal
(B54) No. 22 (+) — Chassis ground ( − − − − ):
Is the measured value less than the speci-
fied value?
6 CHECK POOR CONTACT.
Is there poor contact in shift solenoid 1 circuit?
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Value
1 Ω
1 MΩ
10 — 16 Ω
9V
1V
There is poor contact.
AT-73
Yes
Go to step 2. Repair open circuit
in harness
between TCM and
transmission con-
nector.
Go to step 3. Repair short circuit
in harness
between TCM and
transmission con-
nector.
Go to step 4. Go to step 7.
Go to step 5. Go to step 6.
Even if "POWER" Go to step 6.
indicator lights up,
the circuit has
returned to a nor-
mal condition at
this time. A tempo-
rary poor contact
of the connector or
harness may be
the cause. Repair
harness or con-
tact in the TCM.
Repair poor con- Replace TCM.
tact. <Ref. to AT-76,
Transmission Con-
trol Module
(TCM).>
No