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)

G: DTC C0107 FRONT ABS WHEEL SPEED SENSOR RH MALFUNCTION (ABS

WHEEL SPEED SENSOR ABNORMAL SIGNAL)

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.

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.

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.

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

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

B98

R72

R73

B15

B301

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

ABSCM & H/U

R73

R72

B15

B301

1 2 3 4 5 6 7 8 9 10 11

16 17 18 19 20 21 22 23 24 25 26

B98

2 3

4 5 6 7

8 9 10 11 12 13 14 15 16

1 2

ABS(diag)-47

ABS (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

• RHD model

ABS00723

B97

R72

R73

B15

R73

R72

B301

B15

B301

B97

1 2 3 4 5 6 7 8 9 10 11

16 17 18 19 20 21 22 23 24 25 26

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

ABSCM & H/U

1 2

ABS(diag)-48

ABS (DIAGNOSTICS)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Step

Check

Yes

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.

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.

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.

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.

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.

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.

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.

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.

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.

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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