Subaru Legacy III (2000-2003 year). Service manual — part 372
EN(H6DO)-290
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
BW:DTC P0731 — GEAR 1 INCORRECT RATIO —
NOTE:
For the diagnostic procedure, refer to DTC P0734. <Ref. to EN(H6DO)-291, DTC P0734 — GEAR 4 INCOR-
RECT RATIO —, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
BX:DTC P0732 — GEAR 2 INCORRECT RATIO —
NOTE:
For the diagnostic procedure, refer to DTC P0734. <Ref. to EN(H6DO)-291, DTC P0734 — GEAR 4 INCOR-
RECT RATIO —, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
BY:DTC P0733 — GEAR 3 INCORRECT RATIO —
NOTE:
For the diagnostic procedure, refer to DTC P0734. <Ref. to EN(H6DO)-291, DTC P0734 — GEAR 4 INCOR-
RECT RATIO —, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>
EN(H6DO)-291
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
BZ:DTC P0734 — GEAR 4 INCORRECT RATIO —
• DTC DETECTING CONDITION:
• Two consecutive driving cycles with fault
• TROUBLE SYMPTOM:
• Shift point too high or too low; engine brake not effective in “3” range; excessive shift shock; excessive
tight corner “braking”
CAUTION:
After repair or replacement of faulty parts, conduct Clear Memory Mode<Ref. to EN(H6DO)-54, OP-
ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H6DO)-47, OPERATION, Inspec-
tion Mode.>.
Step
Value
Yes
No
1
CHECK ANY OTHER DTC ON DISPLAY.
Is any other DTC displayed?
Another DTC is displayed.
Inspect relevant
DTC using “List of
Diagnostic Trou-
ble Code (DTC)”.
<Ref. to
EN(H6DO)-89, List
of Diagnostic
Trouble Code
(DTC).>
2
CHECK THROTTLE POSITION SENSOR
CIRCUIT.
Check throttle position sensor circuit. <Ref. to
AT-52, DTC 31 THROTTLE POSITION SEN-
SOR, Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
Is there any trouble in throttle position sensor
circuit?
There is a malfunction.
Repair or replace
throttle position
sensor circuit.
3
CHECK FRONT VEHICLE SPEED SENSOR
CIRCUIT.
Check front vehicle speed sensor circuit. <Ref.
to AT-58, DTC 33 FRONT VEHICLE SPEED
SENSOR, Diagnostic Procedure with Diagnos-
tic Trouble Code (DTC).>
Is there any trouble in front throttle position
sensor circuit?
There is a malfunction.
Repair or replace
front vehicle speed
sensor circuit.
4
CHECK TORQUE CONVERTER TURBINE
SPEED SENSOR CIRCUIT.
Check torque converter turbine speed sensor
circuit. <Ref. to AT-64, DTC 36 TORQUE
CONVERTER TURBINE SPEED SENSOR,
Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
Is there any trouble in torque converter turbine
speed sensor circuit?
There is a malfunction.
Repair or replace
torque converter
turbine speed sen-
sor circuit.
5
CHECK POOR CONTACT.
Check poor contact in TCM connector.
Is there poor contact in TCM connector?
There is poor contact.
Repair poor con-
tact in TCM con-
nector.
6
CHECK MECHANICAL TROUBLE.
Check mechanical trouble in automatic trans-
mission.
Is there any mechanical trouble in automatic
transmission?
There is a malfunction.
Repair or replace
automatic trans-
mission.
Replace TCM.
<Ref. to AT-76,
Transmission Con-
trol Module
(TCM).>
EN(H6DO)-292
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
CA: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(H6DO)-54, OP-
ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H6DO)-47, OPERATION, Inspec-
tion Mode.>.
Step
Value
Yes
No
1
CHECK ANY OTHER DTC ON DISPLAY.
Is any other DTC displayed?
Another DTC is displayed.
Inspect the rele-
vant DTC using
“List of Diagnostic
Trouble Code
(DTC)”. <Ref. to
EN(H6DO)-89, List
of Diagnostic
Trouble Code
(DTC).>
2
CHECK LOCK-UP DUTY SOLENOID CIR-
CUIT.
Check lock-up duty solenoid circuit. <Ref. to
AT-96, DTC 77 LOCK-UP DUTY SOLENOID,
Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
Is there any trouble in lock-up duty solenoid
circuit?
There is a malfunction.
Repair or replace
lock-up duty sole-
noid circuit.
3
CHECK THROTTLE POSITION SENSOR
CIRCUIT.
Check throttle position sensor circuit. <Ref. to
AT-52, DTC 31 THROTTLE POSITION SEN-
SOR, Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
Is there any trouble in throttle position sensor
circuit?
There is a malfunction.
Repair or replace
throttle position
sensor circuit.
4
CHECK TORQUE CONVERTER TURBINE
SPEED SENSOR CIRCUIT.
Check torque converter turbine speed sensor
circuit. <Ref. to AT-64, DTC 36 TORQUE
CONVERTER TURBINE SPEED SENSOR,
Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
Is there any trouble in torque converter turbine
speed sensor circuit?
There is a malfunction.
Repair or replace
torque converter
turbine speed sen-
sor circuit.
5
CHECK ENGINE SPEED INPUT CIRCUIT.
Check engine speed input circuit. <Ref. to AT-
42, DTC 11 ENGINE SPEED SIGNAL, Diag-
nostic Procedure with Diagnostic Trouble
Code (DTC).>
Is there any trouble in engine speed input cir-
cuit?
There is a malfunction.
Repair or replace
engine speed
input circuit.
EN(H6DO)-293
ENGINE (DIAGNOSTICS)
DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
6
CHECK INHIBITOR SWITCH CIRCUIT.
Check inhibitor switch circuit. <Ref. to AT-132,
CHECK INHIBITOR SWITCH., Diagnostic Pro-
cedure for No-diagnostic Trouble Code
(DTC).>
Is there any trouble in inhibitor switch circuit?
There is a malfunction.
Repair or replace
inhibitor switch cir-
cuit.
7
CHECK BRAKE LIGHT SWITCH CIRCUIT.
Check brake light switch circuit. <Ref. to AT-
125, CHECK BRAKE SWITCH., Diagnostic
Procedure for No-diagnostic Trouble Code
(DTC).>
Is there any trouble in brake light switch cir-
cuit?
There is a malfunction.
Repair or replace
brake light switch
circuit.
8
CHECK ATF TEMPERATURE SENSOR CIR-
CUIT.
Check ATF temperature sensor circuit. <Ref.
to AT-48, DTC 27 ATF TEMPERATURE SEN-
SOR, Diagnostic Procedure with Diagnostic
Trouble Code (DTC).>
Is there any trouble in ATF temperature sensor
circuit?
There is a malfunction.
Repair or replace
ATF temperature
sensor circuit.
9
CHECK POOR CONTACT.
Check poor contact in TCM connector.
Is there poor contact in TCM connector?
There is poor contact.
Repair poor con-
tact in TCM con-
nector.
10
CHECK MECHANICAL TROUBLE.
Check mechanical trouble in automatic trans-
mission.
Is there any mechanical trouble in automatic
transmission?
There is a malfunction.
Repair or replace
automatic trans-
mission.
Replace TCM.
<Ref. to AT-76,
Transmission Con-
trol Module
(TCM).>
Step
Value
Yes
No
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