Subaru Legacy (2005 year). Manual — part 616

5AT(diag)-55

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

H: DTC P0725 ENGINE SPEED INPUT CIRCUIT

DTC DETECTING CONDITION:
Information of engine speed is not correctly received from ECM.
TROUBLE SYMPTOM:
No lock-up (after engine warm-up).

I:

DTC P0731 GEAR 1 INCORRECT RATIO

NOTE:
Refer to DTC P0736 for diagnostic procedure. <Ref. to 5AT(diag)-56, DTC P0736 REVERSE INCORRECT
RATIO, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>

J: DTC P0732 GEAR 2 INCORRECT RATIO

NOTE:
Refer to DTC P0736 for diagnostic procedure. <Ref. to 5AT(diag)-56, DTC P0736 REVERSE INCORRECT
RATIO, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>

K: DTC P0733 GEAR 3 INCORRECT RATIO

NOTE:
Refer to DTC P0736 for diagnostic procedure. <Ref. to 5AT(diag)-56, DTC P0736 REVERSE INCORRECT
RATIO, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>

L: DTC P0734 GEAR 4 INCORRECT RATIO

NOTE:
Refer to DTC P0736 for diagnostic procedure. <Ref. to 5AT(diag)-56, DTC P0736 REVERSE INCORRECT
RATIO, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>

M: DTC P0735 GEAR 5 INCORRECT RATIO

NOTE:
Refer to DTC P0736 for diagnostic procedure. <Ref. to 5AT(diag)-56, DTC P0736 REVERSE INCORRECT
RATIO, Diagnostic Procedure with Diagnostic Trouble Code (DTC).>

Step

Check

Yes

No

1

CHECK DTC OF ECM.

Is DTC of AT CAN communica-
tion circuit detected?

Perform the diag-
nosis according to
DTC.

Go to step 2.

2

CHECK DTC OF TCM.

Is DTC of AT CAN communica-
tion circuit detected?

Perform the diag-
nosis according to
DTC.

Go to step 3.

3

CHECK DTC OF TCM.

Is any of following DTC
detected? / Output Speed Sen-
sor Circuit / AT Vehicle Speed
Sensor Circuit Malfunction
(Rear Wheel)

Perform the diag-
nosis according to
DTC.

Replace the TCM.
<Ref. to 5AT-61,
Transmission Con-
trol Module
(TCM).>

5AT(diag)-56

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

N: DTC P0736 REVERSE INCORRECT RATIO

DTC DETECTING CONDITION:
Vehicle speed sensor, torque converter turbine speed sensor or control valve malfunction
TROUBLE SYMPTOM:
• Shift point is too high or too low.
• Excessive shift shock
• Tight corner braking phenomenon is occurred.
• Gear is not shifted to reverse.
• Gear position is held by fail safe function.
• Vehicle does not run.

Step

Check

Yes

No

1

CHECK DTC OF TCM.

Is DTC P1799 displayed at the
same time?

Perform the diag-
nosis according to
DTC.

Go to step 2.

2

CHECK DTC OF TCM.

Is any of the DTC P0751,
P0756, P0761, P0766 dis-
played at the same time?

Perform the diag-
nosis according to
DTC.

Go to step 3.

3

CHECK DTC OF TCM.

Is any of the DTC P0705,
P0715, P0720, P1706, P1710
displayed at the same time?

Perform the diag-
nosis according to
DTC.

Go to step 4.

4

CHECK TURBINE SPEED.
Check the indication of Subaru Select Monitor.

Is the indication changes
according to acceleration,
braking and shifting?

Go to step 5.

Perform the diag-
nosis according to
DTC P0715,
P1710.

5

CHECK FRONT AND REAR VEHICLE
SPEED SENSOR.

Does the value of Subaru
Select Monitor mostly match
with indication of speed meter?

Go to step 6.

Perform the diag-
nosis according to
DTC P0720,
P1706.

6

CHECK INHIBITOR SWITCH.

Does the value of Subaru
Select Monitor match with
value of meter indicator?

Go to step 7.

Perform the diag-
nosis according to
DTC P0705.

7

CHECK DTC OF TCM.
1) Perform the clear memory mode.
2) Perform the inspection mode. <Ref. to
5AT(diag)-21, PROCEDURE, Inspection
Mode.>

Is DTC displayed?

Perform the diag-
nosis according to
DTC.

Go to step 8.

8

DRIVING CHECK.
Perform the road test. <Ref. to 5AT-31,
INSPECTION, Road Test.>

NOTE:

When performing the test, do not exceed post-
ed speed limit.

Is malfunction corrected?

Temporary poor
contact occurs.
Check that the
harness connec-
tor has no faulty.

Replace the trans-
mission assembly.

5AT(diag)-57

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

O: 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. (After engine is warmed-up)

Step

Check

Yes

No

1

CHECK DTC OF TCM.

Is any of following DTC
detected? / AT CAN Communi-
cation Circuit / Engine Speed
Input Circuit / Input/Turbine
Speed Sensor Circuit / Torque
Converter Turbine 2 Speed
Signal Circuit 2 Malfunction

Perform the diag-
nosis according to
each DTC.

Go to step 2.

2

CHECK DTC OF TCM.
1) Perform clear memory mode. <Ref. to
5AT(diag)-19, CLEAR MEMORY MODE,
OPERATION, Subaru Select Monitor.>
2) Read DTC

Is DTC displayed?

Perform the diag-
nosis according to
DTC.

Go to step 3.

3

CHECK INHIBITOR SWITCH CIRCUIT.
Diagnose according to DTC P0705 procedure.

Is there any trouble?

Repair or replace
the inhibitor switch
circuit.

Go to step 4.

4

CHECK STOP LIGHT SWITCH CIRCUIT.
Diagnose according to DTC P0719 and P0724
procedure.

Is there any trouble?

Repair or replace
the stop light
switch circuit.

Go to step 5.

5

CHECK ATF TEMPERATURE SENSOR CIR-
CUIT.
Diagnose according to DTC P0712, P0713,
P1716 and P1717 procedure.

Is there any trouble?

Repair or replace
the ATF tempera-
ture sensor circuit.

There are mal-
functions in TCM,
TCM connector
poor contact, or
transmission
assembly mechan-
ical malfunction.

5AT(diag)-58

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

P: DTC P0743 TORQUE CONVERTER CLUTCH CIRCUIT ELECTRICAL

DTC DETECTING CONDITION:
The output signal circuit of lock up solenoid is open or shorted.
TROUBLE SYMPTOM:
No lock-up (after engine warm-up).
WIRING DIAGRAM:

Step

Check

Yes

No

1

CHECK HARNESS CONNECTOR BETWEEN
TCM AND TRANSMISSION.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from TCM and
transmission.
3) Measure the resistance of harness
between TCM and transmission connector.

Connector & terminal

(B54) No. 23 — (B11) No. 20:
(B54) No. 5 — Chassis ground:
(B54) No. 14 — Chassis ground:

Is the resistance less than 1
Ω?

Go to step 2.

Repair the open
circuit of harness
between TCM con-
nector and trans-
mission connector.

AT-03181

B54

23

B11

T4

TCM

B54

B11

1 2

5

6 7

8

13

14 15

16

9 10

11 12

3 4

17 18

19 20

TRANSMISSION

1 2

7

8

9

5 6

3 4

10 11 12
19 20 21

13

14 15

16

17

18

22

23

24

6

T11

1 2
5

8

6

9 10 11

3 4

12

T11

7

20

5

14

E