Subaru Legacy 2002 Service Manual page 1489

DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
Engine (DIAGNOSTICS)
BR: DTC P0741 — TORQUE CONVERTER CLUTCH SYSTEM MALFUNCTION
—
S048521G04
¼ DTC DETECTING CONDITION:
¼ Two consecutive driving cycles with fault
¼ TROUBLE SYMPTOM:
¼ No lock-up (after engine warm-up)
¼ No shift or excessive tight corner "braking"
CAUTION:
After repair or replacement of faulty parts, conduct CLEAR MEMORY MODE <Ref. to EN(H6)-49,
OPERATION, Clear Memory Mode.> and INSPECTION MODE <Ref. to EN(H6)-46, OPERATION,
Inspection Mode.>.
No.
1 CHECK ANY OTHER DTC ON DISPLAY.
2 CHECK LOCK-UP DUTY SOLENOID CIR-
CUIT.
Check lock-up duty solenoid circuit. <Ref. to
AT-90, DTC 77 LOCK-UP DUTY SOLENOID,
Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
3 CHECK THROTTLE POSITION SENSOR
CIRCUIT.
Check throttle position sensor circuit. <Ref. to
AT-46, DTC 31 THROTTLE POSITION
SENSOR, Diagnostic Procedure with Diag-
nostic Trouble Code (DTC).>
4 CHECK TORQUE CONVERTER TURBINE
SPEED SENSOR CIRCUIT.
Check torque converter turbine speed sensor
circuit. <Ref. to AT-58, DTC 36 TORQUE
CONVERTER TURBINE SPEED SENSOR,
Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
5 CHECK ENGINE SPEED INPUT CIRCUIT.
Check engine speed input circuit. <Ref. to
AT-40, DTC 11 ENGINE SPEED SIGNAL,
Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
6 CHECK INHIBITOR SWITCH CIRCUIT.
Check inhibitor switch circuit. <Ref. to AT-120,
CHECK INHIBITOR SWITCH, Diagnostic Pro-
cedure for No-diagnostic Trouble Code
(DTC).>
7 CHECK BRAKE LIGHT SWITCH CIRCUIT.
Check brake light switch circuit. <Ref. to
AT-109, CHECK BRAKE SWITCH, Diagnostic
Procedure for No-diagnostic Trouble Code
(DTC).>
Step
Is there any other DTC on
display?
Is there any trouble in
lock-up duty solenoid cir-
cuit?
Is there any trouble in
throttle position sensor cir-
cuit?
Is there any trouble in
torque converter turbine
speed sensor circuit?
Is there any trouble in
engine speed input circuit?
Is there any trouble in
inhibitor switch circuit?
Is there any trouble in
brake light switch circuit?
EN(H6)-282
Check Yes
Inspect the rel-
evant DTC using
"List of Diagnostic
Trouble Code
(DTC)". <Ref. to
EN(H6)-87, List of
Diagnostic
Trouble Code
(DTC).>
Repair or replace
lock-up duty sole-
noid circuit.
Repair or replace
throttle position
sensor circuit.
Repair or replace
torque converter
turbine speed
sensor circuit.
Repair or replace
engine speed
input circuit.
Repair or replace
inhibitor switch
circuit.
Repair or replace
brake light switch
circuit.
No
Go to step 2.
Go to step 3.
Go to step 4.
Go to step 5.
Go to step 6.
Go to step 7.
Go to step 8.