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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
• Valve anchoring
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
procedure.
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 data
link connector.
2) Turn the ignition switch to ON.
3) Read the value of accelerator pedal posi-
tion sensor 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 trouble?
Is there any trouble?
Is there any trouble?
Is there any trouble?
Does the value of accelerator
pedal position sensor change
from 0% to 100% smoothly
when throttle was operated
from fully closing to fully open-
ing?
Does the turbine speed dis-
played by Subaru Select Moni-
tor almost correspond with
turbine speed indicated by
tachometer?
Does the engine speed dis-
played by Subaru Select Moni-
tor almost correspond with
engine speed indicated by
tachometer?
4AT(diag)-63
Yes
Repair or replace
Go to step 2.
the lock-up duty
solenoid circuit.
Repair or replace
Go to step 3.
the inhibitor switch
circuit.
Repair or replace
Go to step 4.
the stop light
switch circuit.
Repair or replace
Go to step 5.
the ATF tempera-
ture sensor circuit.
Go to step 6.
Check the acceler-
ator pedal position
sensor circuit.
Go to step 7.
Check torque con-
verter turbine
speed sensor cir-
cuit.
There is transmis-
Check engine
sion assembly
speed signal cir-
mechanical mal-
cuit.
function.
No
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