Subaru Legacy 2004 Service Manual page 2506

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
7 CHECK HARNESS ASSEMBLY.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from transmis-
sion.
3) Disconnect the connector from turbine
speed sensor 1.
4) Measure the resistance between transmis-
sion connector and turbine speed sensor 1
connector.
Connector & terminal
(T4) No. 7 — (AT1) No. 3:
(T3) No. 7 — (AT1) No. 2:
(AT1) No. 1 — Chassis ground:
8 CHECK HARNESS ASSEMBLY.
Measure the resistance between transmission
connector and chassis ground.
Connector & terminal
(T4) No. 7 — Chassis ground:
(T3) No. 7 — Chassis ground:
9 PREPARE SUBARU SELECT MONITOR.
10 PREPARE OSCILLOSCOPE.
11 CHECK INPUT SIGNAL FOR TCM USING
SUBARU SELECT MONITOR.
1) Connect all the connectors.
2) Lift-up the vehicle and support with rigid
racks.
NOTE:
Raise all wheels off floor.
3) Start the engine, and set the vehicle in 4th
speed driving condition of manual mode.
NOTE:
Turbine speed sensor 1 signal can be mea-
sured only on 4th speed.
4) Read the current data of turbine speed sen-
sor 1 using the Subaru Select Monitor. <Ref. to
5AT(diag)-16, READ CURRENT DATA,
OPERATION, Subaru Select Monitor.>
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(diag)-27, Clear Memory
Mode.>
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Check
Is the resistance less than 1
"?
Is the resistance more than 1
M"?
Do you have a Subaru Select
Monitor?
Do you have an oscilloscope? Go to step 12.
Does the value of the turbine
speed sensor 1 change
depending on the acceleration,
deceleration and shifting range
of the vehicle?
5AT(diag)-47
Yes
Go to step 8. Repair the open
circuit in harness
between TCM and
transmission con-
nector, and poor
contact in cou-
pling connector.
Go to step 9. Repair the short
circuit in harness
between TCM and
transmission con-
nector.
Go to step 11. Go to step 10.
Go to step 13.
Even if the SPORT Replace the tur-
indicator lights bine speed sensor
blinks, the system 1. <Ref. to 5AT-57,
is in normal condi- Turbine speed
tion. sensor 1.>
A temporary poor
contact of connec-
tor or harness may
be the cause.
Repair the poor
contact of har-
ness between the
ATF temperature
sensor and trans-
mission connector.
No