Subaru Legacy (2005 year). Manual - part 770

 

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Subaru Legacy (2005 year). Manual - part 770

 

 

ABS(diag)-45

ABS (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

E: DTC C0105 REAR ABS WHEEL SPEED SENSOR RH MALFUNCTION (ABS 

WHEEL SPEED SENSOR ABNORMAL SIGNAL) 

NOTE:
For the diagnostic procedure, refer to DTC C0108. <Ref. to ABS(diag)-46, 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:
For the diagnostic procedure, refer to DTC C0108. <Ref. to ABS(diag)-46, 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:
For the diagnostic procedure, refer to DTC C0108. <Ref. to ABS(diag)-46, DTC C0108 FRONT ABS WHEEL
SPEED SENSOR LH MALFUNCTION (ABS WHEEL SPEED SENSOR ABNORMAL SIGNAL), Diagnostic
Procedure with Diagnostic Trouble Code (DTC).>

5

CHECK ABSCM&H/U POWER SUPPLY CIR-
CUIT.
1) Turn the ignition switch to OFF.
2) Disconnect the ABSCM&H/U connector.
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, 
ABSCM&H/U 
power circuit.

6

CHECK ABS WHEEL SPEED SENSOR SIG-
NAL.
1) Install the ABS wheel speed sensor.
2) Prepare an oscilloscope.
3) Check ABS wheel speed sensor. <Ref. to 
ABS-13, 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 speed 
sensor.

7

CHECK ABSCM&H/U.
1) Connect all the connectors.
2) Perform clear memory mode.
3) Perform the inspection mode. <Ref. to 
ABS(diag)-25, 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 ANY OTHER DTC ON DISPLAY.

Is any other DTC displayed?

Perform the diag-
nosis according to 
DTC. 

It results from a 
temporary noise 
interference.

Step

Check

Yes

No

ABS(diag)-46

ABS (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

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:
• 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)-47

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)-48

ABS (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Step

Check

Yes

No

1

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

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 con-
nectors between ABSCM&H/U 
and ABS wheel speed sensor?

Repair the con-
nector.

Go to step 3.

3

CHECK SOURCES OF SIGNAL NOISE.
Make sure the radio wave devices and electric 
components are installed correctly.

Are the radio wave devices and 
electric components installed 
correctly?

Go to step 4.

Install the radio 
wave device and 
electric compo-
nents properly.

4

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

Is the noise sources installed? Install the noise 

sources apart from 
the sensor har-
ness.

Go to step 5.

5

CHECK ABSCM&H/U.
1) Connect all the connectors.
2) Perform clear memory mode.
3) Perform the inspection mode. <Ref. to 
ABS(diag)-25, 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 ANY OTHER DTC ON DISPLAY.

Is any other DTC displayed?

Perform the diag-
nosis according to 
DTC. 

It results from a 
temporary noise 
interference.

7

CHECK INSTALLATION OF ABS WHEEL 
SPEED SENSOR.

Is the ABS wheel speed sen-
sor 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 ABS wheel speed sensor. <Ref. to 
ABS-13, 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 turned? Does the oscillo-
scope indication repeat the 
waveform pattern like shown in 
the figure when the tire is 
slowly turned in equal speed 
for more one rotation?

Go to step 10.

Go to step 9.

9

CHECK ABS WHEEL SPEED SENSOR AND 
MAGNETIC ENCODER.

Is there foreign particles, 
breakage or damage in the 
pole piece of ABS wheel speed 
sensor or magnetic encoder?

Remove dirt com-
pletely. Replace 
the ABS wheel 
speed sensor or 
magnetic encoder 
as a unit with hub 
unit bearing when 
it is broken or 
damaged.

Go to step 10.

10

CHECK SOURCES OF SIGNAL NOISE.
Make sure the radio wave devices and electric 
components are installed correctly.

Are the radio wave devices and 
electric components installed 
correctly?

Go to step 11.

Install the radio 
wave device and 
electric compo-
nents properly.

 

 

 

 

 

 

 

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