Subaru Legacy 2002 Service Manual page 1862

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
No.
10 CHECK POOR CONTACT.
11 CHECK LOCK-UP DUTY SOLENOID (IN
TRANSMISSION).
1) Remove transmission connector from
bracket.
2) Drain automatic transmission fluid.
CAUTION:
Do not drain the automatic transmission
fluid until it cools down.
3) Remove oil pan, and disconnect connector
from lock-up duty solenoid.
4) Measure resistance between lock-up duty
solenoid connector and transmission ground.
Terminal
No. 1 — Transmission ground:
12 CHECK HARNESS CONNECTOR
BETWEEN LOCK-UP DUTY SOLENOID
AND TRANSMISSION.
Measure resistance of harness between
lock-up duty solenoid and transmission con-
nector.
Connector & terminal
(T4) No. 13 — (AT3) No. 1:
13 CHECK HARNESS CONNECTOR
BETWEEN LOCK-UP DUTY SOLENOID
AND TRANSMISSION.
Measure resistance of harness between
transmission connector and transmission
ground.
Connector & terminal
(T4) No. 13 — Transmission ground:
Step
Is there poor contact in
lock-up duty solenoid cir-
cuit?
Is the resistance between
10 and 17 Ω?
Is the resistance less than
1 Ω?
Is the resistance more than
1 MΩ?
AT-93
Automatic Transmission (Diagnostics)
Check Yes
Repair poor con-
tact.
Go to step 12.
Go to step 13.
Even if "POWER"
indicator lights up,
the circuit has
returned to a nor-
mal condition at
this time. A tem-
porary poor con-
tact of the con-
nector or harness
may be the
cause. Repair
harness or con-
nector in lock-up
duty solenoid and
transmission.
No
Replace TCM.
<Ref. to AT-49,
Transmission
Control Module
(TCM).>
Replace lock-up
duty solenoid.
<Ref. to AT-42,
Shift Solenoids,
Duty Solenoids
and ATF Tempera-
ture Sensor.>
Repair open cir-
cuit in harness
between TCM and
transmission con-
nector.
Repair short cir-
cuit in harness
between lock-up
duty solenoid and
transmission con-
nector.