Subaru Legacy 2003 Service Manual page 2352

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Step
1 CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
1) Turn ignition switch to OFF.
2) Disconnect connector from TCM and trans-
mission.
3) Measure resistance of harness between
TCM and shift solenoid 2 connector.
Connector & terminal
(B54) No. 5 — (B11) No. 2:
Is the measured value less than the speci-
fied value?
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:
Does the measured value exceed the specified
range?
3 CHECK SHIFT SOLENOID 2.
Measure resistance between transmission
connector terminals.
Connector & terminal
(T4) No. 2 — No. 16:
Is the measured value within the specified
range?
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:
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 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 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. 22 (+) — Chassis ground ( − − − − ):
Is the measured value less than the speci-
fied value?
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Value
1 Ω
1 MΩ
10 — 16 Ω
1 V
AT-77
Yes
Go to step 2. Repair open circuit
in harness
between TCM and
transmission con-
nector.
Go to step 3. Repair short circuit
in harness
between TCM and
transmission con-
nector.
Go to step 4. Go to step 6.
Even if "POWER" Go to step 5.
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 the TCM
and transmission.
No