Subaru Legacy 2002 Service Manual page 1840

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. 5 — Transmission ground:
3 CHECK SHIFT SOLENOID 2.
Measure resistance between transmission
connector terminals.
Connector & terminal
(T4) No. 2 — 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 "D", and slowly
increase vehicle speed to 50 km/h (31 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. 22 (+) — Chassis ground (−):
5 CHECK POOR CONTACT.
6 CHECK SHIFT SOLENOID 2 (IN TRANSMIS-
SION).
1) Remove transmission connector from
bracket.
2) Drain automatic transmission fluid.
CAUTION:
Do not drain the automatic transmission
fluid until it cools down.
3) Remove oil pan, and disconnect connector
from shift solenoid 2.
4) Measure resistance between shift solenoid
2 connector and transmission ground.
Connector & terminal
No. 1 — Transmission 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 there poor contact in
shift solenoid 2 circuit?
Is the resistance between
10 and 16 Ω?
AT-71
Automatic Transmission (Diagnostics)
Check Yes
Go to step 3.
Go to step 4.
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-
nector in the TCM
and transmission.
Repair poor con-
tact.
Go to step 7.
No
Repair short cir-
cuit in harness
between TCM and
transmission con-
nector.
Go to step 6.
Go to step 5.
Replace TCM.
<Ref. to AT-49,
Transmission
Control Module
(TCM).>
Replace shift
solenoid 2 assem-
bly. <Ref. to
AT-42, Shift
Solenoids, Duty
Solenoids and
ATF Temperature
Sensor.>