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).>

Go to step 2.

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.

Go to step 3.

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.

Go to step 4.

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.

Go to step 5.

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.

Go to step 6.

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).>

Go to step 2.

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.

Go to step 3.

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.

Go to step 4.

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.

Go to step 5.

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.

Go to step 6.

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.

Go to step 7.

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.

Go to step 8.

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.

Go to step 9.

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.

Go to step 10.

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