Subaru Legacy 2003 Service Manual page 2393

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
8 CHECK INPUT SIGNAL FOR TCM.
1) Connect connectors to TCM and transmis-
sion.
2) Lift-up or raise the vehicle and place safety
stands.
NOTE:
Raise all wheels off floor.
3) Start the engine and set vehicle in 20 km/h
(12 MPH) condition.
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.>
4) Measure voltage between TCM connector
terminals.
Connector & terminal
(B55) No. 24 (+) — (B54) No. 19 ( − − − − ):
Does the measured value exceed the spec-
ified value?
9 CHECK INPUT SIGNAL FOR TCM USING
SUBARU SELECT MONITOR.
1) Connect connectors to TCM and transmis-
sion.
2) Connect Subaru Select Monitor to data link
connector.
3) Lift-up or raise the vehicle and place safety
stands.
NOTE:
Raise all wheels off floor.
4) Turn ignition switch to ON and turn Subaru
Select Monitor switch to ON.
5) Start the engine.
6) Read data of vehicle speed using Subaru
Select Monitor.
•Compare speedometer with Subaru Select
Monitor indications.
•Vehicle speed is indicated in "km/h" or "MPH".
7) Slowly increase vehicle speed to 60 km/h
or 37 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.>
Does the speedometer indication increase
as the Subaru Select Monitor data
increases?
Step Value
AC 1 V
Speedometer indication
increases as the Subaru Select
Monitor data increases
AT-118
Yes
Even if "POWER" Go to step 11.
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.
Even if "POWER" Go to step 11.
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