Subaru Legacy 2002 Service Manual page 1848

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
No.
2 CHECK HARNESS CONNECTOR
BETWEEN TCM AND TRANSMISSION.
Measure resistance of harness between TCM
connector and transmission ground.
Connector & terminal
(B54) No. 16 — Chassis ground:
3 CHECK 2-4 BRAKE TIMING SOLENOID.
Measure resistance between transmission
connector terminals.
Connector & terminal
(T4) No. 4 — No. 16:
4 CHECK OUTPUT SIGNAL EMITTED FROM
TCM.
1) Connect connectors to TCM and transmis-
sion.
2) Lift-up or raise the vehicle and support with
safety stand.
NOTE:
On AWD models, 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
operating temperature.
4) Move selector lever to "1", and slowly
increase vehicle speed to 10 km/h (6 MPH).
NOTE:
The speed difference between front and rear
wheels may light the ABS warning light, but
this indicates no malfunction. When AT control
diagnosis is finished, perform the ABS
memory clearance procedure of on-board
diagnostics system. <Ref. to ABS-21, Clear
Memory Mode.>
5) Measure voltage between TCM connector
and chassis ground.
Connector & terminal
(B54) No. 16 (+) — Chassis ground (−):
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
diagnosis is finished, perform the ABS
memory clearance procedure of on-board
diagnostics system. <Ref. to ABS-21, Clear
Memory Mode.>
2) Measure voltage between TCM connector
and chassis ground.
Connector & terminal
(B54) No. 16 (+) — Chassis ground (−):
Step
Is the resistance more than
1 MΩ?
Is the resistance between
10 and 16 Ω?
Is the voltage less than 1
V?
Is the voltage more than 9
V?
AT-79
Automatic Transmission (Diagnostics)
Check Yes
Go to step 3.
Go to step 4.
Go to step 5.
Even if "POWER"
indicator lights up,
the circuit has
returned to a nor-
mal condition at
this time. A tem-
porary poor con-
tact of the con-
nector or harness
may be the
cause. Repair
harness or con-
tact in the trans-
mission.
No
Repair short cir-
cuit in harness
between TCM and
transmission con-
nector.
Go to step 7.
Go to step 6.
Go to step 6.