Subaru Legacy IV (2008 year). Service manual — part 908
ABS(diag)-31
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ABS (DIAGNOSTICS)
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:
Refer to DTC C0104 for diagnostic procedure. <Ref. to ABS(diag)-32, 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:
Refer to DTC C0104 for diagnostic procedure. <Ref. to ABS(diag)-32, 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:
Refer to DTC C0104 for diagnostic procedure. <Ref. to ABS(diag)-32, 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)-32
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ABS (DIAGNOSTICS)
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:
4
3
1
16
17
2
15
B98
R72
R2
E
1
2
15
14
6
5
R73
1
2
B6
B15
R73
R72
1
2
1 2
2 1
6
5
B301
2
1
B15
B6
B301
B98
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
ABSCM & H/U
ABS00995
1 2 3
4 5 6 7
8 9 10 11 12 13 14 15 16
TWISTED P
AIR LINE
TWISTED P
AIR LINE
TWISTED P
AIR LINE
TWISTED P
AIR LINE
TWISTED P
AIR LINE
TWISTED P
AIR LINE
FRONT ABS
WHEEL SPEED
SENSOR LH
FRONT ABS
WHEEL SPEED
SENSOR RH
REAR ABS
WHEEL SPEED
SENSOR LH
REAR ABS
WHEEL SPEED
SENSOR RH
ABS(diag)-33
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ABS (DIAGNOSTICS)
Step
Check
Yes
No
1
CHECK POOR CONTACT IN CONNECTOR.
Check if there is poor contact between
ABSCM&H/U and ABS wheel speed sensor.
Is there poor contact?
Repair the connec-
tor.
Go to step 2.
2
CHECK HARNESS CONNECTOR BETWEEN
ABSCM&H/U AND ABS WHEEL SPEED
SENSOR.
1) Disconnect the connector (B301) from the
ABSCM&H/U.
2) Disconnect the connector from the 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. 2:
(B301) No. 6 — (B6) No. 1:
DTC C0104
(B301) No. 16 — (B15) No. 2:
(B301) No. 1 — (B15) No. 1:
Is the resistance less than 0.5
:? Go to step 3.
Repair the harness
connector between
ABSCM&H/U and
ABS wheel speed
sensor.
3
CHECK GROUND SHORT OF HARNESS.
Measure the resistance between the
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 1 M
: or
more?
Go to step 4.
Repair the harness
connector between
ABSCM&H/U and
ABS wheel speed
sensor.
4
CHECK ABS WHEEL SPEED SENSOR POW-
ER SUPPLY CIRCUIT.
1) Connect 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. 2 (+) — Chassis ground (–):
DTC C0104
(B15) No. 2 (+) — Chassis ground (–):
Is the voltage 5 — 16 V?
Go to step 6.
Go to step 5.
ABS(diag)-34
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ABS (DIAGNOSTICS)
E: DTC C0105 REAR ABS WHEEL SPEED SENSOR RH MALFUNCTION (ABS
WHEEL SPEED SENSOR ABNORMAL SIGNAL)
NOTE:
Refer to DTC C0108 for diagnostic procedure. <Ref. to ABS(diag)-35, DTC C0108 FRONT ABS WHEEL
SPEED SENSOR LH MALFUNCTION (ABS WHEEL SPEED SENSOR ABNORMAL SIGNAL), Diagnostic
Procedure with Diagnostic Trouble Code (DTC).>
F: DTC C0106 REAR ABS WHEEL SPEED SENSOR LH MALFUNCTION (ABS
WHEEL SPEED SENSOR ABNORMAL SIGNAL)
NOTE:
Refer to DTC C0108 for diagnostic procedure. <Ref. to ABS(diag)-35, DTC C0108 FRONT ABS WHEEL
SPEED SENSOR LH MALFUNCTION (ABS WHEEL SPEED SENSOR ABNORMAL SIGNAL), Diagnostic
Procedure with Diagnostic Trouble Code (DTC).>
G: DTC C0107 FRONT ABS WHEEL SPEED SENSOR RH MALFUNCTION (ABS
WHEEL SPEED SENSOR ABNORMAL SIGNAL)
NOTE:
Refer to DTC C0108 for diagnostic procedure. <Ref. to ABS(diag)-35, DTC C0108 FRONT ABS WHEEL
SPEED SENSOR LH MALFUNCTION (ABS WHEEL SPEED SENSOR ABNORMAL SIGNAL), Diagnostic
Procedure with Diagnostic Trouble Code (DTC).>
5
CHECK THE ABSCM&H/U POWER SUPPLY
CIRCUIT.
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. 18 (+) — (B301) No. 15 (–):
Is the voltage 10 — 15 V?
Go to step 6.
Check the genera-
tor, battery and
ABSCM&H/U
power supply cir-
cuit.
6
CHECK ABS WHEEL SPEED SENSOR SIG-
NAL.
1) Install the ABS wheel speed sensor.
2) Prepare an oscilloscope.
3) Check the ABS wheel speed sensor. <Ref.
to ABS-14, ABS WHEEL SPEED SENSOR,
INSPECTION, Front ABS Wheel Speed Sen-
sor.>
Is the pattern the same wave-
form as shown in the figure?
Go to step 7.
Replace the ABS
wheel speed sen-
sor.
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 only. <Ref.
to ABS-8,
REPLACEMENT,
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).>
It results from a
temporary noise
interference.
Step
Check
Yes
No
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