Subaru Legacy (2005 year). Service manual — part 769

ABS(diag)-41

ABS (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

12.Diagnostic Procedure with Diagnostic Trouble Code (DTC)

A: DTC C0101 ABS WHEEL SPEED SENSOR MALFUNCTION RR SENSOR

(BROKEN WIRE, INPUT VOLTAGE TOO HIGH)

NOTE:
For the diagnostic procedure, refer to DTC C0104. <Ref. to ABS(diag)-42, DTC C0104 ABS WHEEL SPEED
SENSOR MALFUNCTION FL SENSOR (BROKEN WIRE, INPUT VOLTAGE TOO HIGH), Diagnostic Pro-
cedure with Diagnostic Trouble Code (DTC).>

B: DTC C0102 ABS WHEEL SPEED SENSOR MALFUNCTION RL SENSOR

(BROKEN WIRE, INPUT VOLTAGE TOO HIGH)

NOTE:
For the diagnostic procedure, refer to DTC C0104. <Ref. to ABS(diag)-42, DTC C0104 ABS WHEEL SPEED
SENSOR MALFUNCTION FL SENSOR (BROKEN WIRE, INPUT VOLTAGE TOO HIGH), Diagnostic Pro-
cedure with Diagnostic Trouble Code (DTC).>

C: DTC C0103 ABS WHEEL SPEED SENSOR MALFUNCTION FR SENSOR

(BROKEN WIRE, INPUT VOLTAGE TOO HIGH)

NOTE:
For the diagnostic procedure, refer to DTC C0104. <Ref. to ABS(diag)-42, DTC C0104 ABS WHEEL SPEED
SENSOR MALFUNCTION FL SENSOR (BROKEN WIRE, INPUT VOLTAGE TOO HIGH), Diagnostic Pro-
cedure with Diagnostic Trouble Code (DTC).>

ABS(diag)-42

ABS (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

D: DTC C0104 ABS WHEEL SPEED SENSOR MALFUNCTION FL SENSOR

(BROKEN WIRE, INPUT VOLTAGE TOO HIGH)

DTC DETECTING CONDITION:
• Defective ABS wheel speed sensor (broken wire, input voltage too high)
• Defective harness connector
TROUBLE SYMPTOM:
ABS does not operate.
WIRING DIAGRAM:
• LHD model

ABS00722

4

3

1

16

17

2

15

B98

R72

R2

E

1

2

15

14

6

5

R73

1

2

B6

B15

2

1

6

5

B301

1

2

FRONT ABS

WHEEL SPEED

SENSOR LH

TWISTED WIRE

FRONT ABS

WHEEL SPEED

SENSOR RH

REAR ABS

WHEEL SPEED

SENSOR LH

REAR ABS

WHEEL SPEED

SENSOR RH

TWISTED WIRE

TWISTED WIRE

TWISTED WIRE

ABSCM & H/U

R73

R72

B15

B6

B301

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

B98

2 3

4 5 6 7

8 9 10 11 12 13 14 15 16

1

1 2

ABS(diag)-43

ABS (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

• RHD model

ABS00723

4

3

1

16

17

2

15

B97

R72

R1

E

1

2

19

18

8

7

R73

1

2

B6

B15

R73

R72

2

1

6

5

B301

1

2

B15

B6

B301

B97

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

1 2 3 4

5 6 7 8 9

10 11 12 13 14 15 16 17 18 19 20

FRONT ABS

WHEEL SPEED

SENSOR LH

TWISTED WIRE

FRONT ABS

WHEEL SPEED

SENSOR RH

REAR ABS

WHEEL SPEED

SENSOR LH

REAR ABS

WHEEL SPEED

SENSOR RH

TWISTED WIRE

TWISTED WIRE

TWISTED WIRE

ABSCM & H/U

1 2

ABS(diag)-44

ABS (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Step

Check

Yes

No

1

CHECK POOR CONTACT IN CONNECTOR.
Check the poor contact between ABSCM&H/U
and ABS wheel speed sensor.

Is there poor contact?

Repair the con-
nector.

Go to step 2.

2

CHECK HARNESS CONNECTOR BETWEEN
ABSCM&H/U AND ABS WHEEL SPEED
SENSOR.
1) Disconnect the connector (B301) from
ABSCM&H/U.
2) Disconnect the connector from ABS wheel
speed sensor.
3) Measure the resistance between
ABSCM&H/U connector and ABS wheel speed
sensor connector.

Connector & terminal
DTC C0101

(B301) No. 3 — (R72) No. 1:
(B301) No. 4 — (R72) No. 2:

DTC C0102

(B301) No. 2 — (R73) No. 1:
(B301) No. 17 — (R73) No. 2:

DTC C0103

(B301) No. 5 — (B6) No. 1:
(B301) No. 6 — (B6) No. 2:

DTC C0104

(B301) No. 16 — (B15) No. 1:
(B301) No. 1 — (B15) No. 2:

Is the resistance less than 0.5
Ω?

Go to step 3.

Repair the har-
ness connector
between
ABSCM&H/U and
ABS wheel speed
sensor.

3

CHECK GROUND SHORT OF HARNESS.
Measure the resistance between ABSCM&H/U
connector and chassis ground.

Connector & terminal
DTC C0101

(B301) No. 4 — Chassis ground:

DTC C0102

(B301) No. 17 — Chassis ground:

DTC C0103

(B301) No. 6 — Chassis ground:

DTC C0104

(B301) No. 1 — Chassis ground:

Is the resistance more than 1
M

Ω?

Go to step 4.

Repair the har-
ness connector
between
ABSCM&H/U and
ABS wheel speed
sensor.

4

CHECK ABS WHEEL SPEED SENSOR POW-
ER SUPPLY CIRCUIT.
1) Connect the ABSCM&H/U connector.
2) Turn the ignition switch to ON.
3) Measure the voltage between ABS wheel
speed sensor connector and chassis ground.

Connector & terminal
DTC C0101

(R72) No. 1 — Chassis ground (

−

):

DTC C0102

(R73) No. 1 — Chassis ground (

−

):

DTC C0103

(B6) No. 1 (+) — Chassis ground (

−

):

DTC C0104

(B15) No. 1 (+) — Chassis ground (

−

):

Is the voltage 5 — 16 V?

Go to step 6.

Go to step 5.