Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Manual — part 786

LAN(diag)-53

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

LAN SYSTEM (DIAGNOSTICS)

I: DTC U1213 CAN-HS VDC/ABS DATA ABNORMAL

DTC DETECTING CONDITION:

Received error data from VDC/ABS CM.

TROUBLE SYMPTOM:

It is possible that brake control error may occur.

WIRING DIAGRAM:

CAN communication system <Ref. to WI-171, WIRING DIAGRAM, CAN Communication System.>

Step

Check

Yes

No

1

CHECK DTC.
Read all DTCs using the Subaru Select Monitor.
<Ref. to LAN(diag)-13, READ DIAGNOSTIC
TROUBLE CODE (DTC), OPERATION, Subaru
Select Monitor.>

Is there DTC U1202?

Perform the diag-
nosis according to
DTC.

Go to step

2.

2

CHECK DTC.
Read the DTC of body integrated unit using
Subaru Select Monitor.

Is U1213 a current malfunc-
tion?

Go to step

3.

Go to step

4.

2

1

B231

1

8

2

B380

B3

B9

B280

B:

6

14

B40

B380

1 2 3 4

17 18 19 20

5 6 7 8

21 22 23 24

9 10 11 12

25 26 27 28

13 14 15 16
29 30 31 32

4 5 6 7 8 9

6

2

7

2

8

2

9

2

0

3

2 3

1

1

3

2

3

3

3

4

3

5

3

6

3

0

1

1

1

4

1

5

1

6

1

7

1

8

1

9

1

7

3

8

3

9

3

0

4

2

1

3

1

1

4

2

4

3

4

4

4

5

4

6

4

0

2

1

2

3

2

4

2

2

2

5

2

B310

B231

1 2 3 4

B230

1

2

3

4

C: B136

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

B280

B:

1 2 3

4 5 6

7 8 9 10 11 12 13 14 15 16 17

18 19 20

21 22 23 24

25 26

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16

B40

C17

C28

C: B136

B230

3

2

B310

10

35

LAN00907

SI

SI

SI

VDC CM

ECM

DCCD CM

YAW RATE &

G SENSOR

: WITH SI-DRIVE

DATA LINK

CONNECTOR

BODY

INTEGRATED

UNIT

STEERING

ANGLE

SENSOR

LAN(diag)-54

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

LAN SYSTEM (DIAGNOSTICS)

3

CHECK DTC.
1) Turn the ignition switch to OFF.
2) Disconnect the VDC/ABS CM connector.
3) Connect the disconnected connectors.
4) Turn the ignition switch to ON.
5) Read the DTC of body integrated unit using
Subaru Select Monitor.

Is U1213 a current malfunc-
tion?

Replace the VDC/
ABS CM. <Ref. to
VDC-8,
REMOVAL, VDC
Control Module
and Hydraulic Con-
trol Unit
(VDCCM&H/U).>

Go to step

4.

4

CHECK HARNESS.
1) Turn the ignition switch to OFF.
2) Shake the harness used for CAN communi-
cation circuit.
3) Turn the ignition switch to ON.
4) Read the DTC of body integrated unit using
Subaru Select Monitor.

Is U1213 a current malfunc-
tion?

Repair or replace
the harness.

Go to step

5.

5

CHECK CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector that is connected
to high speed CAN circuit.

Is there poor contact of connec-
tor terminal?

Repair the connec-
tor terminal, or
replace harness.

It is possible that
temporary poor
communication
occurs.

Step

Check

Yes

No

LAN(diag)-55

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

LAN SYSTEM (DIAGNOSTICS)

J: DTC U1216 HIGH-SPEED CAN (DCCD) DATA ERROR

DTC DETECTING CONDITION:

Received error data from DCCD CM.

TROUBLE SYMPTOM:

DCCD indicator blinks.

WIRING DIAGRAM:

CAN communication system <Ref. to WI-171, WIRING DIAGRAM, CAN Communication System.>

Step

Check

Yes

No

1

CHECK DTC.
Read all DTCs using the Subaru Select Monitor.
<Ref. to LAN(diag)-13, READ DIAGNOSTIC
TROUBLE CODE (DTC), OPERATION, Subaru
Select Monitor.>

Is there DTC U1202?

Perform the diag-
nosis according to
DTC.

Go to step

2.

2

CHECK DTC.
Read the DTC of body integrated unit using
Subaru Select Monitor.

Is U1216 a current malfunc-
tion?

Go to step

3.

Go to step

4.

2

1

B231

1

8

2

B380

B3

B9

B280

B:

6

14

B40

B380

1 2 3 4

17 18 19 20

5 6 7 8

21 22 23 24

9 10 11 12

25 26 27 28

13 14 15 16
29 30 31 32

4 5 6 7 8 9

6

2

7

2

8

2

9

2

0

3

2 3

1

1

3

2

3

3

3

4

3

5

3

6

3

0

1

1

1

4

1

5

1

6

1

7

1

8

1

9

1

7

3

8

3

9

3

0

4

2

1

3

1

1

4

2

4

3

4

4

4

5

4

6

4

0

2

1

2

3

2

4

2

2

2

5

2

B310

B231

1 2 3 4

B230

1

2

3

4

C: B136

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

B280

B:

1 2 3

4 5 6

7 8 9 10 11 12 13 14 15 16 17

18 19 20

21 22 23 24

25 26

1 2 3 4 5 6 7 8

9 10 11 12 13 14 15 16

B40

C17

C28

C: B136

B230

3

2

B310

10

35

LAN00907

SI

SI

SI

VDC CM

ECM

DCCD CM

YAW RATE &

G SENSOR

: WITH SI-DRIVE

DATA LINK

CONNECTOR

BODY

INTEGRATED

UNIT

STEERING

ANGLE

SENSOR

LAN(diag)-56

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

LAN SYSTEM (DIAGNOSTICS)

3

CHECK DTC.
1) Turn the ignition switch to OFF.
2) Disconnect the DCCD CM connector.
3) Connect the disconnected connectors.
4) Turn the ignition switch to ON.
5) Read the DTC of body integrated unit using
Subaru Select Monitor.

Is U1216 a current malfunc-
tion?

Replace the DCCD
CM. <Ref. to 6MT-
123, REMOVAL,
Driver’s Control
Center Differential
Control Module.>

Go to step

4.

4

CHECK HARNESS.
1) Turn the ignition switch to OFF.
2) Shake the harness used for CAN communi-
cation circuit.
3) Turn the ignition switch to ON.
4) Read the DTC of body integrated unit using
Subaru Select Monitor.

Is U1216 a current malfunc-
tion?

Repair or replace
the harness.

Go to step

5.

5

CHECK CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector that is connected
to high speed CAN circuit.

Is there poor contact of connec-
tor terminal?

Repair the connec-
tor terminal, or
replace harness.

Temporary com-
munication failure
occurs.

Step

Check

Yes

No