Subaru Legacy 2003 Service Manual page 649

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ENGINE (DIAGNOSTICS)
BK:DTC P0741 — TORQUE CONVERTER CLUTCH CIRCUIT PERFORMANCE
OR STUCK OFF —
• DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• TROUBLE SYMPTOM:
• No lock-up (after engine warm-up)
• No shift or excessive tight corner "braking"
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode<Ref. to EN(H4SO)-47, OPER-
ATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4SO)-40, OPERATION, Inspection
Mode.> .
1 CHECK ANY OTHER DTC ON DISPLAY.
Is any other DTC displayed?
2 CHECK LOCK-UP DUTY SOLENOID CIR-
CUIT.
Check lock-up duty solenoid circuit.
Is there any trouble in lock-up duty solenoid
circuit?
<Ref. to AT-96, DTC 77 LOCK-UP DUTY
SOLENOID, Diagnostic Procedure with Diag-
nostic Trouble Code (DTC).>
3 CHECK THROTTLE POSITION SENSOR
CIRCUIT.
Check throttle position sensor circuit.
Is there any trouble in throttle position sensor
circuit?
<Ref. to AT-52, DTC 31 THROTTLE POSI-
TION SENSOR, Diagnostic Procedure with
Diagnostic Trouble Code (DTC).>
4 CHECK TORQUE CONVERTER TURBINE
SPEED SENSOR CIRCUIT.
Check torque converter turbine speed sensor
circuit.
Is there any trouble in torque converter turbine
speed sensor circuit?
<Ref. to AT-64, DTC 36 TORQUE CON-
VERTER TURBINE SPEED SENSOR, Diag-
nostic Procedure with Diagnostic Trouble
Code (DTC).>
5 CHECK ENGINE SPEED INPUT CIRCUIT.
Check engine speed input circuit.
Is there any trouble in engine speed input cir-
cuit?
<Ref. to AT-42, DTC 11 ENGINE SPEED
SIGNAL, Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
Step
EN(H4SO)-252
Value
DTC indicated.
There is a fault.
There is a fault.
There is a fault.
There is a fault.
Yes
Inspect the rele- Go to step 2.
vant DTC using
"List of Diagnostic
Trouble Code
(DTC)". <Ref. to
EN(H4SO)-83, List
of Diagnostic
Trouble Code
(DTC).>
Repair or replace Go to step 3.
lock-up duty sole-
noid circuit.
Repair or replace Go to step 4.
throttle position
sensor circuit.
Repair or replace Go to step 5.
torque converter
turbine speed sen-
sor circuit.
Repair or replace Go to step 6.
engine speed
input circuit.
No