Subaru 2003 LEGACY Service Manual page 88

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
5 CHECK OUTPUT SIGNAL EMITTED FROM
TCM.
1) Move selector lever to "D", and slowly
increase vehicle speed to 65 km/h (40
MPH).
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.>
2) Measure voltage between TCM connector
and chassis ground.
Connector & terminal
(B54) No. 16 (+) — Chassis ground ( − − − − ):
Does the measured value exceed the spec-
ified value?
6 CHECK POOR CONTACT.
Is there poor contact in 2-4 brake timing sole-
noid circuit?
7 CHECK 2-4 BRAKE TIMING SOLENOID (IN
TRANSMISSION).
1) Remove transmission connector from
bracket.
2) Lift-up or raise the vehicle and support with
safety stand.
NOTE:
Raise all wheels off ground.
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 2-4 brake timing solenoid.
5) Measure resistance between 2-4 brake tim-
ing solenoid connector and transmission
ground.
Terminal
No. 1 — Transmission ground:
Is the measured value within the specified
range?
8 CHECK HARNESS CONNECTOR BETWEEN
2-4 BRAKE TIMING SOLENOID AND
TRANSMISSION.
Measure resistance of harness between 2-4
brake timing solenoid and transmission con-
nector.
Connector & terminal
(AT8) No. 1 — (T4) No. 4:
Is the measured value less than the specified
value?
Step Value
9 V
There is poor contact.
10 — 16 Ω
1 Ω
AT-86
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 trans-
mission.
Repair poor con- Replace TCM.
tact. <Ref. to AT-76,
Transmission Con-
trol Module
(TCM).>
Go to step 8. Replace 2-4 brake
timing solenoid.
<Ref. to AT-67,
Shift Solenoids,
Duty Solenoids
and ATF Temper-
ature Sensor.>
Go to step 9. Repair open circuit
in harness
between 2-4 brake
timing solenoid
and transmission
connector.
No