Subaru LEGACY 2006 Manual page 3439

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
N: DTC P0741 TORQUE CONVERTER CLUTCH CIRCUIT PERFORMANCE OR
STUCK OFF
DTC DETECTING CONDITION:
• Lock up clutch malfunction
• Sticky valve
TROUBLE SYMPTOM:
No lock-up occurs.
Step
1 CHECK LOCK-UP DUTY SOLENOID CIR-
CUIT.
Diagnose according to DTC P0743 procedure.
2 CHECK INHIBITOR SWITCH CIRCUIT.
Diagnose according to DTC P0705 procedure.
3 CHECK STOP LIGHT SWITCH CIRCUIT.
Diagnose according to DTC P0719 and P0724
procedures.
4 CHECK ATF TEMPERATURE SENSOR CIR-
CUIT.
Diagnose according to DTC P0712 AND
P0713 procedure.
5 CHECK ACCELERATOR PEDAL POSITION
SENSOR.
1) Connect the Subaru Select Monitor to the
data link connector.
2) Turn the ignition switch to ON.
3) Read the value of "Accel. opening angle"
on Subaru Select Monitor display.
6 CHECK TORQUE CONVERTER TURBINE
SPEED SENSOR.
1) Shift the select lever to "P" or "N" range.
2) Idle the engine.
7 CHECK ENGINE SPEED SIGNAL.
Idle the engine.
AUTOMATIC TRANSMISSION (DIAGNOSTICS)
Check
Is there any fault?
Is there any fault?
Is there any fault?
Is there any fault?
Does the value of accelerator
pedal position sensor change
from 0% to 100% smoothly
when throttle is operated from
fully closed to fully open?
Does the value of turbine
speed displayed by Subaru
Select Monitor almost corre-
spond with the value of the
tachometer?
Does the value of turbine
speed displayed by Subaru
Select Monitor almost corre-
spond with the value of the
tachometer?
4AT(diag)-53
Yes No
Repair or replace Go to step 2.
the lock up duty
solenoid circuit.
Repair or replace Go to step 3.
the inhibitor switch
circuit.
Go to step 4.
Repair or replace
the stop light
switch circuit.
Go to step 5.
Repair or replace
the ATF tempera-
ture sensor circuit.
Go to step 6.
Check the acceler-
ator pedal position
sensor circuit.
Go to step 7. Check the torque
converter turbine
speed sensor cir-
cuit.
There is transmis- Check the engine
sion assembly speed signal cir-
mechanical mal- cuit.
function.