Subaru 2003 LEGACY Service Manual page 106

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
5 CHECK OUTPUT SIGNAL EMITTED FROM
TCM.
1) Turn ignition switch OFF.
2) Lift-up the vehicle and place safety stand.
NOTE:
Raise all wheels off ground.
3) Start engine, and warm transmission until
ATF temperature becomes 80°C (176°F) or
more.
4) Move select lever to SPORT shift mode.
5) Increase speed up to 25 km/h (16 MPH) at
2nd.
NOTE:
The speed difference between front and rear
wheels may light the ABS warning light, but this
indicates no malfunction. When AT control di-
agnosis is finished, perform the ABS memory
clearance procedure of on-board diagnostics
system. <Ref. to ABS-22, Clear Memory
Mode.> or <Ref. to VDC-25, Clear Memory
Mode.>
6) Shift down to 1st speed, and effectively use
engine brake.
7) Measure voltage between TCM connector
and body ground when engine brake is
effective.
Connector & terminal
(B54) No. 14 (+) — Chassis ground ( − − − − ):
Is the measured value less than the speci-
fied value?
6 CHECK POOR CONTACT.
Is there poor contact in SPORT shift solenoid
circuit?
7 CHECK SHIFT SOLENOID 1 (IN TRANSMIS-
SION).
1) Remove transmission connector from
bracket.
2) Lift-up or raise the vehicle and support with
safety stand.
3) Drain automatic transmission fluid.
CAUTION:
Do not drain the automatic transmission flu-
id until it cools down.
4) Remove oil pan, and disconnect connector
from SPORT shift solenoid.
5) Measure resistance between SPORT shift
solenoid connector and transmission
ground.
Terminal
No. 1 — Transmission ground:
Is the measured value within the specified
range?
Step Value
1V
There is poor contact.
10 — 16 Ω
AT-104
Yes
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).>
Go to step 8. Replace SPORT
shift solenoid.
<Ref. to AT-67,
Shift Solenoids,
Duty Solenoids
and ATF Temper-
ature Sensor.>
No