Subaru Legacy IV (2008 year). Service manual — part 913

ABS(diag)-51

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ABS (DIAGNOSTICS)

Step

Check

Yes

No

1

CHECK INPUT VOLTAGE OF ABSCM&H/U.
1) Turn the ignition switch to OFF.
2) Disconnect the ABSCM&H/U connectors.
3) Run the engine at idle.
4) Measure the voltage between ABSCM&H/U
connector and chassis ground.

Connector & terminal

(B301) No. 18 (+) — Chassis ground (–):
(B301) No. 14 (+) — Chassis ground (–):

Is the voltage 10 — 15 V?

Go to step 2.

Repair the harness
connector between
battery and
ABSCM&H/U.

2

CHECK THE ABSCM&H/U GROUND CIR-
CUIT.
1) Turn the ignition switch to OFF.
2) Measure the resistance between the
ABSCM&H/U connector and chassis ground.

Connector & terminal

(B301) No. 15 — Chassis ground:

Is the resistance less than 0.5

:? Go to step 3.

Repair the
ABSCM&H/U
ground harness.

3

CHECK VALVE RELAY IN ABSCM&H/U.
Measure the resistance between the
ABSCM&H/U terminals.

Terminals

No. 14 — No. 15:

Is the resistance 1 M

: or

more?

Go to step 4.

Replace the
ABSCM only. <Ref.
to ABS-8,
REPLACEMENT,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>

4

CHECK POOR CONTACT IN CONNECTOR.

Is there poor contact in connec-
tor between generator, battery
and ABSCM&H/U?

Repair the connec-
tor.

Go to step 5.

5

CHECK ABSCM&H/U.
1) Connect all connectors.
2) Clear the memory. <Ref. to ABS(diag)-20,
Clear Memory Mode.>
3) Perform the Inspection Mode. <Ref. to
ABS(diag)-19, Inspection Mode.>
4) Read the DTC.

Is the same DTC displayed?

Replace the
ABSCM only. <Ref.
to ABS-8,
REPLACEMENT,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>

Go to step 6.

6

CHECK FOR ANY OTHER DTC ON DISPLAY. Is any other DTC displayed?

Check DTC using
“List of Diagnostic
Trouble Code
(DTC)”. <Ref. to
ABS(diag)-29, List
of Diagnostic Trou-
ble Code (DTC).>

Temporary poor
contact occurs.

ABS(diag)-52

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ABS (DIAGNOSTICS)

V: DTC C0111 MOTOR/MOTOR RELAY MALFUNCTION

DTC DETECTING CONDITION:
• Defective motor
• Defective motor relay
• Defective harness connector
TROUBLE SYMPTOM:
ABS does not operate.
WIRING DIAGRAM:

B301

E

E

13

15

12

ABSCM & H/U

18

M

MAIN SBF

SBF-6

No.33

E

SBF-1

FL INLET

FR INLET

RL INLET

RR INLET

FL OUTLET

FR OUTLET

RL OUTLET

RR OUTLET

B301

4 5 6 7 8 9

16 17 18 19 20

2 3

1

21 22 23 24 25 26

10 11

13

14

12

15

ABS00997

PUMP MOTOR

BATTERY

IGNITION
SWITCH

MOTOR RELAY

VALVE RELAY

SOLENOID VALVE

ABS(diag)-53

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ABS (DIAGNOSTICS)

Step

Check

Yes

No

1

CHECK INPUT VOLTAGE OF ABSCM&H/U.
1) Turn the ignition switch to OFF.
2) Disconnect the ABSCM&H/U connectors.
3) Turn the ignition switch to ON.
4) Measure the voltage between ABSCM&H/U
connector and chassis ground.

Connector & terminal

(B301) No. 13 (+) — Chassis ground (–):

Is the voltage 10 — 15 V?

Go to step 2.

Repair the harness
connector between
battery and
ABSCM&H/U.

2

CHECK INSTALLATION OF MOTOR
GROUND.

Is the motor ground terminal
installation bolt tightened to
33 N·m (3.3 kgf-m, 24.3 ft-lb)?

Go to step 3.

Tighten the motor
ground terminal
installation bolt.

3

CHECK GROUND CIRCUIT OF MOTOR.
1) Turn the ignition switch to OFF.
2) Measure the resistance between the
ABSCM&H/U connector and chassis ground.

Connector & terminal

(B301) No. 12 — Chassis ground:

Is the resistance less than 0.5

:? Go to step 4.

Repair the
ABSCM&H/U
ground harness.

4

CHECK INPUT VOLTAGE OF ABSCM&H/U.
1) Run the engine at idle.
2) Measure the voltage between ABSCM&H/U
connector and chassis ground.

Connector & terminal

(B301) No. 18 (+) — Chassis ground (–):

Is the voltage 10 — 15 V?

Go to step 5.

Repair the harness
connector between
battery, ignition
switch and
ABSCM&H/U.

5

CHECK THE ABSCM&H/U GROUND CIR-
CUIT.
1) Turn the ignition switch to OFF.
2) Measure the resistance between the
ABSCM&H/U connector and chassis ground.

Connector & terminal

(B301) No. 15 — Chassis ground:

Is the resistance less than 0.5

:? Go to step 6.

Repair the
ABSCM&H/U
ground harness.

6

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

Is there poor contact in connec-
tor between generator, battery
and ABSCM&H/U?

Repair the connec-
tor.

Go to step 7.

7

CHECK ABSCM&H/U.
1) Connect all connectors.
2) Clear the memory. <Ref. to ABS(diag)-20,
Clear Memory Mode.>
3) Perform the Inspection Mode. <Ref. to
ABS(diag)-19, Inspection Mode.>
4) Read the DTC.

Is the same DTC displayed?

Replace the
ABSCM&H/U.
<Ref. to ABS-6,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>

Go to step 8.

8

CHECK FOR ANY OTHER DTC ON DISPLAY. Is any other DTC displayed?

Check DTC using
“List of Diagnostic
Trouble Code
(DTC)”. <Ref. to
ABS(diag)-29, List
of Diagnostic Trou-
ble Code (DTC).>

Temporary poor
contact occurs.

NOTE:
Though the ABS
warning light re-
mains on at this
time, this is normal.
Drive the vehicle at
12 km/h (7 MPH)
or more in order to
turn ABS warning
light off. Be sure to
drive the vehicle
and check that the
warning light goes
off.

ABS(diag)-54

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ABS (DIAGNOSTICS)

W: DTC C0116 FAULTY STOP LIGHT SWITCH

DTC DETECTING CONDITION:
Defective stop light switch
WIRING DIAGRAM:

MAIN SBF

SBF-2

No.8

7.5A

B301

2
3

E

20

ABSCM & H/U

B65

9

5

B159

3

4

B225

1 2 3 4 5 6 7 8 9 10 11

16 17 18 19 20 21 22 23 24 25 26

13

12

15

14

9

4

7

6

2

1
5

3
8

B159

B301

B65

1

2

3

4

B225

13
14

15 16

17

27

24

25
26

20

21
22

23

29
30

31

28

32

35

33
34

37
38

39

36

40

8

9

10

11 12

1

2

5

3

4

7

6

19

18

ABS00998

BATTERY

STOP LIGHT
SWITCH

FUSE
(RELAY BLOCK)