Subaru Legacy 2002 Service Manual page 1857

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 2-4 BRAKE 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 2-4 brake duty solenoid.
4) Measure resistance between 2-4 brake
duty solenoid connector and transmission
ground.
Terminal
No. 1 — Transmission ground:
11 CHECK HARNESS CONNECTOR
BETWEEN TRANSMISSION AND 2-4
BRAKE DUTY SOLENOID.
Measure resistance of harness between 2-4
brake duty solenoid and transmission connec-
tor.
Connector & terminal
(T4) No. 9 — (AT7) No. 1:
12 CHECK HARNESS CONNECTOR
BETWEEN TRANSMISSION AND 2-4
BRAKE DUTY SOLENOID.
Measure resistance of harness between
transmission connector and transmission
ground.
Connector & terminal
(T4) No. 9 — Transmission ground:
Step
Is the value less than
25%?
Is there poor contact in 2-4
brake duty solenoid circuit?
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-88
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 TCM
and transmission.
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 2-4 brake
duty solenoid.
<Ref. to AT-42,
Shift Solenoids,
Duty Solenoids
and ATF Tempera-
ture Sensor.>
Repair open cir-
cuit in harness
between 2-4
brake duty sole-
noid and trans-
mission connec-
tor.
Repair short cir-
cuit in harness
between 2-4
brake duty sole-
noid and trans-
mission connec-
tor.