Subaru Legacy 2004 Service Manual page 2577

Diagnostic Procedure with Diagnostic Trouble Code (DTC)
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
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 set the vehicle in 1st
speed driving condition of manual mode.
4) Read the current data of torque converter
turbine speed 2 using the Subaru Select Moni-
tor.
<Ref. to 5AT(diag)-16, 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.
Connector & terminal
Positive probe; (B55) No. 22:
Ground lead; (B54) No. 19:
4) Start the engine, and set the vehicle in 1st
speed driving condition of manual mode.
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.>
Check
Does the value of the turbine
speed sensor 2 change
depending on the acceleration,
deceleration and shifting gear
of the vehicle?
Is the frequency of measured
waveform (pulse wave)
changed depending on the
acceleration and deceleration
of the vehicle?
5AT(diag)-118
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 in harness
of turbine speed
sensor 2 and
transmission con-
nector.
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 in harness
of turbine speed
sensor 2 and
transmission con-
nector.
No