Subaru 2003 LEGACY Service Manual page 92

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
7 CHECK OUTPUT SIGNAL EMITTED FROM
TCM USING SUBARU SELECT MONITOR.
1) Connect connectors to TCM and transmis-
sion.
2) Connect Subaru Select Monitor to data link
connector.
3) Start the engine, and turn Subaru Select
Monitor switch to ON.
4) Warm-up the transmission until ATF tem-
perature is above 80°C (176°F).
NOTE:
If ambient temperature is below 0°C (32°F),
drive the vehicle until the ATF reaches its oper-
ating temperature.
5) Stop the engine and turn ignition switch to
ON (engine OFF).
6) Move select lever to "N".
7) Read data of line pressure duty solenoid
using Subaru Select Monitor.
•Line pressure duty solenoid is indicated in
"%".
8) Throttle is fully closed.
Is line pressure duty solenoid data value
the specified value?
8 CHECK OUTPUT SIGNAL EMITTED FROM
TCM USING SUBARU SELECT MONITOR.
1) Turn ignition switch to ON (Engine OFF).
2) Throttle is fully open.
3) Read line pressure duty solenoid data
using Subaru Select Monitor.
Is line pressure duty solenoid data less
than the specified value?
9 CHECK POOR CONTACT.
Is there poor contact in line pressure duty sole-
noid circuit?
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 flu-
id 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:
Is the measured value within the specified
range?
Step Value
100%
25%
There is poor contact.
2.0 — 4.5 Ω
AT-90
Yes
Go to step 8. Go to step 9.
Even if "POWER" Go to step 9.
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-
nector in transmis-
sion.
Repair poor con- Replace TCM.
tact. <Ref. to AT-76,
Transmission Con-
trol Module
(TCM).>
Go to step 11. Replace line pres-
sure duty solenoid.
<Ref. to AT-67,
Shift Solenoids,
Duty Solenoids
and ATF Temper-
ature Sensor.>
No