Subaru 2003 LEGACY Service Manual page 101

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
8 CHECK OUTPUT SIGNAL EMITTED FROM
TCM USING SUBARU SELECT MONITOR.
1) Connect connectors to TCM and transmis-
sion.
2) Lift-up the vehicle and place safety stand.
NOTE:
Raise all wheels off ground.
3) Connect Subaru Select Monitor to data link
connector.
4) Start the engine, and turn Subaru Select
Monitor switch to ON.
5) 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.
6) Read data of lock-up duty solenoid using
Subaru Select Monitor.
•Lock-up duty solenoid is indicated in "%".
7) 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.>
Is lock-up duty solenoid data the specified
value?
9 CHECK OUTPUT SIGNAL EMITTED FROM
TCM USING SUBARU SELECT MONITOR.
1) Return the engine to idling speed and move
selector lever to "N".
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) Read lock-up solenoid data using Subaru
Select Monitor.
Is lock-up solenoid data value the specified
value?
10 CHECK POOR CONTACT.
Is there poor contact in lock-up duty solenoid
circuit?
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Value
95%
5%
There is poor contact.
AT-99
Yes
Go to step 9. 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.
Repair poor con- Replace TCM.
tact. <Ref. to AT-76,
Transmission Con-
trol Module
(TCM).>
No