Subaru 2003 LEGACY Service Manual page 100

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
6 CHECK OUTPUT SIGNAL EMITTED FROM
TCM.
1) Connect connectors to TCM and transmis-
sion.
2) Lift-up the vehicle and place safety stand.
NOTE:
Raise all wheels off ground.
3) Start the engine and warm-up the transmis-
sion until ATF temperature 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.
4) Move selector lever to "D" and slowly
increase vehicle speed to 75 km/h (47
MPH). Wheels will lock-up.
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.>
5) Measure voltage between TCM connector
and chassis ground.
Connector & terminal
(B54) No. 7 (+) — Chassis ground ( − − − − ):
Does the measured value exceed the spec-
ified value?
7 CHECK OUTPUT SIGNAL EMITTED FROM
TCM.
1) Return the engine to idling speed and move
select lever to "N".
2) Measure voltage between TCM connector
and chassis ground.
Connector & terminal
(B54) No. 7 (+) — Chassis ground ( − − − − ):
Is the measured value less than the speci-
fied value?
Step Value
8.5 V
0.5 V
AT-98
Yes
Go to step 7. Go to step 10.
Even if "POWER" Go to step 10.
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 TCM and
transmission.
No