Subaru Legacy IV (2008 year). Service manual - part 770

 

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Subaru Legacy IV (2008 year). Service manual - part 770

 

 

5AT(diag)-95

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

AH:DTC P1718 AT CAN COMMUNICATION CIRCUIT

NOTE:
DTC P1718 AT CAN communication circuit, refer to “LAN System”. <Ref. to LAN(diag)-12, READ DIAGNOS-
TIC TROUBLE CODE (DTC), OPERATION, Subaru Select Monitor.>

5AT(diag)-96

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

AI: DTC P1760 LATERAL ACCELERATION SENSOR PERFORMANCE PROBLEM

DTC DETECTING CONDITION:
Lateral G sensor output voltage fault
WIRING DIAGRAM:

Step

Check

Yes

No

1

CHECK VEHICLE CONDITION.

Is the vehicle a model with 
VDC, which has the VDC OFF 
switch on the instrument panel?

Go to step 2.

Go to step 4.

2

CHECK DTC OF TCM.

Is DTC of AT CAN communica-
tion detected?

Perform the diag-
nosis according to 
DTC.

Go to step 3.

3

CHECK DTC OF ABS.

Is DTC of ABS detected?

Perform the diag-
nosis according to 
DTC of ABS.

Temporary poor 
contact occurs. 
Recheck for defec-
tive parts in har-
ness and 
connectors.

4

CHECK OUTPUT OF LATERAL G SENSOR 
USING SUBARU SELECT MONITOR.
Read the value of “Lateral G Sensor” using 
Subaru Select Monitor.

Is the reading indicated on 
monitor display 2.3 to 2.7 V?

Go to step 5.

Go to step 10.

5

CHECK OUTPUT OF LATERAL G SENSOR 
USING SUBARU SELECT MONITOR.
1) Turn the ignition switch to OFF.
2) Remove the console box.
3) Remove the lateral G sensor from vehicle. 
(Do not disconnect the connector.)
4) Turn the ignition switch to ON.
5) Read the value of “Lateral G Sensor” using 
Subaru Select Monitor.

Is the value on the display 3.3 — 
4.3 V with the lateral G sensor 
inclined 90° to right?

Go to step 6.

Replace the lateral 
G sensor. <Ref. to 
5AT-61, Lateral G 
Sensor.>

6

CHECK OUTPUT OF LATERAL G SENSOR 
USING SUBARU SELECT MONITOR.
Read the value of “Lateral G Sensor” using 
Subaru Select Monitor.

Is the value on the display 0.7 — 
1.7 V with the lateral G sensor 
inclined 90° to left?

Go to step 7.

Replace the lateral 
G sensor. <Ref. to 
5AT-61, Lateral G 
Sensor.>

7

CHECK POOR CONTACT IN CONNECTOR.
Turn the ignition switch to OFF.

Is there poor contact in connec-
tor between TCM and lateral G 
sensor?

Repair the connec-
tor.

Go to step 8.

AT-04479

2

1

3

B359

B7

B9

B55

B:

TCM

B359

1 2 3

B:

B55

5

6

7

2

1

3

4

29

10 11 12 13 14 15

25

24

16

30

9

8

17 18 19

20
28

21 22 23

32

31

26 27

33

34 35

A:

B54

16

10 11 12 13 14 15

25

24

30

9

8

7

17 18 19 20
28

21 22 23

29

32

31

1

2

3

4

5

6

27

26

33 34 35

 LATERAL G SENSOR

A:

B54

A18

5AT(diag)-97

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

8

CHECK ABSCM&H/U.
1) Connect all connectors.
2) Perform the Clear Memory Mode.
3) Perform the Inspection Mode. 
4) Read the DTC. 

Is the same DTC displayed?

Replace the TCM. 
<Ref. to 5AT-60, 
Transmission Con-
trol Module 
(TCM).>

Go to step 9.

9

CHECK OTHER DTC DETECTION.

Is any other DTC displayed?

Perform the diag-
nosis according to 
DTC.

Temporary poor 
contact occurs.

10

CHECK OPEN CIRCUIT IN LATERAL G SEN-
SOR OUTPUT HARNESS AND GROUND 
HARNESS.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from TCM.
3) Measure the resistance between TCM con-
nector terminals.

Connector & terminal

(B54) No. 18 — (B55) No. 7:

Is the resistance 5.0 — 6.0 k

:? Go to step 11.

Repair the harness 
between lateral G 
sensor and TCM.

11

CHECK LATERAL G SENSOR.
1) Remove the console box.
2) Remove the lateral G sensor from vehicle.
3) Connect the connector to lateral G sensor.
4) Connect the connector to ABSCM&H/U.
5) Turn the ignition switch to ON.
6) Measure the voltage between lateral G sen-
sor connector terminals.

Connector & terminal

(B359) No. 3 (+) — No. 2 (–):

Is the voltage 2.3 — 2.7 V when 
lateral G sensor is in horizontal 
position?

Go to step 12.

Replace the lateral 
G sensor. <Ref. to 
5AT-61, Lateral G 
Sensor.>

12

CHECK LATERAL G SENSOR.
Measure the voltage between lateral G sensor 
connector terminals.

Connector & terminal

(B359) No. 3 (+) — No. 2 (–):

Is the voltage 3.3 — 4.3 V when 
lateral G sensor is inclined 90° 
to right?

Go to step 13.

Replace the lateral 
G sensor. <Ref. to 
5AT-61, Lateral G 
Sensor.>

13

CHECK LATERAL G SENSOR.
Measure the voltage between lateral G sensor 
connector terminals.

Connector & terminal

(B359) No. 3 (+) — No. 2 (–):

Is the voltage 0.7 — 1.7 V when 
lateral G sensor is inclined 90° 
to left?

Go to step 14.

Replace the lateral 
G sensor. <Ref. to 
5AT-61, Lateral G 
Sensor.>

14

CHECK ABSCM&H/U.
1) Turn the ignition switch to OFF.
2) Connect all connectors.
3) Perform the Clear Memory Mode.
4) Perform the Inspection Mode. 
5) Read the DTC. 

Is the same DTC displayed?

Replace the TCM. 
<Ref. to 5AT-60, 
Transmission Con-
trol Module 
(TCM).>

Go to step 15.

15

CHECK OTHER DTC DETECTION.

Is any other DTC displayed?

Perform the diag-
nosis according to 
DTC.

Temporary poor 
contact occurs.

Step

Check

Yes

No

5AT(diag)-98

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

AUTOMATIC TRANSMISSION (DIAGNOSTICS)

AJ:DTC P1761 LATERAL ACCELERATION SENSOR CIRCUIT LOW

DTC DETECTING CONDITION:
• Lateral G sensor open circuit or output voltage fault (Model without VDC)
• CAN communication malfunction (Model with VDC)
WIRING DIAGRAM:

Step

Check

Yes

No

1

CHECK VEHICLE CONDITION.

Is the vehicle a model with 
VDC, which has the VDC OFF 
switch on the instrument panel?

Go to step 2.

Go to step 4.

2

CHECK DTC OF TCM.

Is DTC of AT CAN communica-
tion detected?

Perform the diag-
nosis according to 
DTC.

Go to step 3.

3

CHECK DTC OF ABS.

Is DTC of ABS detected?

Perform the diag-
nosis according to 
DTC of ABS.

Temporary poor 
contact occurs. 
Recheck for defec-
tive parts in har-
ness and 
connectors.

4

CHECK OUTPUT OF LATERAL G SENSOR 
USING SUBARU SELECT MONITOR.
Read the value of “Lateral G Sensor” using 
Subaru Select Monitor.

Is the reading indicated on 
monitor display 2.3 to 2.7 V 
when lateral G sensor is level?

Go to step 5.

Go to step 8.

5

CHECK POOR CONTACT IN CONNECTOR.
Turn the ignition switch to OFF.

Is there poor contact in connec-
tor between TCM and lateral G 
sensor?

Repair the connec-
tor.

Go to step 6.

6

CHECK ABSCM&H/U.
1) Connect all connectors.
2) Perform the Clear Memory Mode.
3) Perform the Inspection Mode. 
4) Read the DTC. 

Is the same DTC displayed?

Replace the TCM. 
<Ref. to 5AT-60, 
Transmission Con-
trol Module 
(TCM).>

Go to step 7.

7

CHECK OTHER DTC DETECTION.

Is any other DTC displayed?

Perform the diag-
nosis according to 
DTC.

Temporary poor 
contact occurs.

AT-04479

2

1

3

B359

B7

B9

B55

B:

TCM

B359

1 2 3

B:

B55

5

6

7

2

1

3

4

29

10 11 12 13 14 15

25

24

16

30

9

8

17 18 19

20
28

21 22 23

32

31

26 27

33

34 35

A:

B54

16

10 11 12 13 14 15

25

24

30

9

8

7

17 18 19 20
28

21 22 23

29

32

31

1

2

3

4

5

6

27

26

33 34 35

 LATERAL G SENSOR

A:

B54

A18

 

 

 

 

 

 

 

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