Subaru Legacy 2004 Service Manual page 2512

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
8 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 drive it.
4) Read the current data of front wheel speed
using 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.>
9 CHECK INPUT SIGNAL FOR TCM USING
OSCILLOSCOPE.
1) Connect all the connectors.
2) Lift-up the vehicle and support with rigid
racks.
NOTE:
Raise all wheels off floor.
3) Set the oscilloscope to TCM connector ter-
minals.
Positive probe; (B55) No. 16:
Ground lead; (B54) No. 19:
4) Start the engine, and drive it.
5) Display the pulse signal of turbine speed
sensor 1 to oscilloscope, and measure the fre-
quency.
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
Does the value of the front
wheel speed depending on the
acceleration and deceleration
of the vehicle?
Is the frequency of measured
waveform (pulse wave)
changed depending on the
acceleration and deceleration
of the vehicle?
5AT(diag)-53
Yes
Even if the SPORT Go to step 11.
indicator lights
blinks, the system
is in normal condi-
tion.
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.
Even if the SPORT Go to step 11.
indicator lights
blinks, the system
is in normal condi-
tion.
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