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.
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?
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?
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?
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