Subaru Legacy IV (2008 year). Manual - part 909

 

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Subaru Legacy IV (2008 year). Manual - part 909

 

 

ABS(diag)-35

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ABS (DIAGNOSTICS)

H: DTC C0108 FRONT ABS WHEEL SPEED SENSOR LH MALFUNCTION (ABS 

WHEEL SPEED SENSOR ABNORMAL SIGNAL)

DTC DETECTING CONDITION:
• Defective ABS wheel speed sensor signal (noise, abnormal signal, etc.)
• 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)-36

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ABS (DIAGNOSTICS)

Step

Check

Yes

No

1

CHECK OUTPUT OF ABS WHEEL SPEED 
SENSOR USING SUBARU SELECT MONI-
TOR.
1) Select {Current Data Display & Save} in the 
Subaru Select Monitor.
2) Read the output of the faulty ABS wheel 
speed sensor.

Does the speed indicated on 
the display change in response 
to the speedometer reading 
during acceleration/decelera-
tion when the steering wheel is 
in the straight-ahead position?

Go to step 2.

Go to step 7.

2

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

Is there poor contact in connec-
tors between ABSCM&H/U and 
ABS wheel speed sensor?

Repair the connec-
tor.

Go to step 3.

3

CHECK CAUSE OF SIGNAL NOISE.
Make sure the radio wave devices and elec-
tronic components are installed correctly.

Are the radio wave devices and 
electronic components 
installed correctly?

Go to step 4.

Install the radio 
wave devices and 
electronic compo-
nents properly.

4

CHECK CAUSE OF SIGNAL NOISE.
Check if the noise sources (such as an 
antenna) are installed near the sensor harness.

Are noise sources installed?

Install the noise 
sources apart from 
sensor harness.

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).>

It results from a 
temporary noise 
interference.

7

CHECK INSTALLATION OF ABS WHEEL 
SPEED SENSOR.

Is the ABS wheel speed sensor 
installation bolt tightened 7.5 
N·m (0.76 kgf-m, 5.5 ft-lb)?

Go to step 8.

Tighten the ABS 
wheel speed sen-
sor installation 
bolts.

8

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.>

Does the oscilloscope indicate 
the waveform pattern like 
shown in the figure when the 
tire is slowly turned? Does the 
oscilloscope indication repeat 
the waveform pattern like 
shown in the figure when the 
tire is slowly turned in equal 
speed for one rotation or more?

Go to step 10.

Go to step 9.

9

CHECK ABS WHEEL SPEED SENSOR OR 
MAGNETIC ENCODER.

Are there foreign matter, break-
age or damage at the tip of ABS 
wheel speed sensor or mag-
netic encoder?

Remove dirt thor-
oughly. Also 
replace the ABS 
wheel speed sen-
sor or magnetic 
encoder as a unit 
with hub unit bear-
ing if it is broken or 
damaged.

Go to step 10.

10

CHECK CAUSE OF SIGNAL NOISE.
Make sure the radio wave devices and elec-
tronic components are installed correctly.

Are the radio wave devices and 
electronic components 
installed correctly?

Go to step 11.

Install the radio 
wave devices and 
electronic compo-
nents properly.

ABS(diag)-37

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ABS (DIAGNOSTICS)

11

CHECK CAUSE OF SIGNAL NOISE.
Check if the noise sources (such as an 
antenna) are installed near the sensor harness.

Is the noise sources installed? Go to step 12.

Install the noise 
sources apart from 
sensor harness.

12

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 13.

13

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.

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.

Step

Check

Yes

No

ABS(diag)-38

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

ABS (DIAGNOSTICS)

I:

DTC C0115 ABS WHEEL SPEED SENSOR SIGNAL MALFUNCTION IN ONE 
OF FOUR WHEELS

DTC DETECTING CONDITION:
• Defective ABS wheel speed sensor signal (noise, abnormal signal, etc.)
• Defective magnetic encoder
• When a wheel is turned freely for a long time
TROUBLE SYMPTOM:
• ABS does not operate.
• EBD does not operate.

NOTE:
Brake warning light illuminates as well as the ABS warning light.
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

 

 

 

 

 

 

 

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