Subaru Legacy 2002 Service Manual page 1853

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Automatic Transmission (Diagnostics)
No.
8 CHECK OUTPUT SIGNAL EMITTED FROM
TCM USING SUBARU SELECT MONITOR.
1) Turn ignition switch to ON (Engine OFF).
2) Throttle is fully open.
9 CHECK POOR CONTACT.
10 CHECK LINE PRESSURE 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 line pressure duty solenoid.
4) Measure resistance between line pressure
duty solenoid connector and transmission
ground.
Terminal
No. 1 — Transmission ground:
11 CHECK HARNESS CONNECTOR
BETWEEN TRANSMISSION AND LINE
PRESSURE DUTY SOLENOID.
Measure resistance of harness between line
pressure duty solenoid and transmission con-
nector.
Connector & terminal
(T4) No. 5 — (AT2) No. 1:
12 CHECK HARNESS CONNECTOR
BETWEEN TRANSMISSION AND LINE
PRESSURE DUTY SOLENOID.
Measure resistance of harness between
transmission connector and transmission
ground.
Connector & terminal
(T4) No. 5 — Transmission ground:
Step
Is the value less than
25%?
Is there poor contact in line
pressure duty solenoid cir-
cuit?
Is the resistance between
2.0 and 4.5 Ω?
Is the resistance less than
1 Ω?
Is the resistance more than
1 MΩ?
AT-84
Check Yes
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 trans-
mission.
Repair poor con-
tact.
Go to step 11.
Go to step 12.
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 line
pressure duty
solenoid and
transmission.
No
Go to step 9.
Replace TCM.
<Ref. to AT-49,
Transmission
Control Module
(TCM).>
Replace line pres-
sure duty sole-
noid. <Ref. to
AT-42, Shift
Solenoids, Duty
Solenoids and
ATF Temperature
Sensor.>
Repair open cir-
cuit in harness
between line pres-
sure duty solenoid
and transmission
connector.
Repair short cir-
cuit in harness
between line pres-
sure duty solenoid
and transmission
connector.