Subaru Legacy III (2000-2003 year). Manual — part 718

ABS-90

ABS (DIAGNOSTICS)

DIAGNOSTICS CHART WITH SUBARU SELECT MONITOR

8

CHECK ABS SENSOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from ABS sensor.
3) Measure resistance of ABS sensor connec-

tor terminals.

Terminal

Front RH No. 1 — No. 2:
Front LH No. 1 — No. 2:
Rear RH No. 1 — No. 2:
Rear LH No. 1 — No. 2:

Is the measured value within the specified
range?

1 - 1.5 k

Ω

Go to step 9.

Replace ABS sen-
sor. Front: <Ref.
to ABS-12, Front
ABS Sensor.>
Rear: <Ref. to
ABS-15, Rear
ABS Sensor.>

9

CHECK BATTERY SHORT OF ABS SEN-
SOR.
1) Disconnect connector from ABSCM&H/U.
2) Measure voltage between ABS sensor and

chassis ground.

Terminal

Front RH No. 1 (+) — Chassis ground (

−−−−

):
Front LH No. 1 (+) — Chassis ground (

−−−−

):
Rear RH No. 1 (+) — Chassis ground (

−−−−

):
Rear LH No. 1 (+) — Chassis ground (

−−−−

):

Is the measured value less than the speci-
fied value?

1 V

Go to step 10.

Replace ABS sen-
sor. Front: <Ref.
to ABS-12, Front
ABS Sensor.>
Rear: <Ref. to
ABS-15, Rear
ABS Sensor.>

10

CHECK BATTERY SHORT OF ABS SEN-
SOR.
1) Turn ignition switch to ON.
2) Measure voltage between ABS sensor and

chassis ground.

Terminal

Front RH No. 1 (+) — Chassis ground (

−−−−

):
Front LH No. 1 (+) — Chassis ground (

−−−−

):
Rear RH No. 1 (+) — Chassis ground (

−−−−

):
Rear LH No. 1 (+) — Chassis ground (

−−−−

):

Is the measured value less than the speci-
fied value?

1 V

Go to step 11.

Replace ABS sen-
sor. Front: <Ref.
to ABS-12, Front
ABS Sensor.>
Rear: <Ref. to
ABS-15, Rear
ABS Sensor.>

11

CHECK HARNESS/CONNECTOR BETWEEN
ABSCM&H/U AND ABS SENSOR.
1) Turn ignition switch to OFF.
2) Connect connector to ABS sensor.
3) Measure resistance between ABSCM&H/U

connector terminals.

Connector & terminal

DTC 21 / (F49) No. 11 — No. 12:
DTC 23 / (F49) No. 9 — No. 10:
DTC 25 / (F49) No. 14 — No. 15:
DTC 27 / (F49) No. 7 — No. 8:

Is the measured value within the specified
range?

1 - 1.5 k

Ω

Go to step 12.

Repair harness/
connector
between
ABSCM&H/U and
ABS sensor.

Step

Value

Yes

No

ABS-91

ABS (DIAGNOSTICS)

DIAGNOSTICS CHART WITH SUBARU SELECT MONITOR

12

CHECK BATTERY SHORT OF HARNESS.
Measure voltage between ABSCM&H/U con-
nector and chassis ground.

Connector & terminal

DTC 21 / (F49) No. 11 (+) — Chassis
ground (

−−−−

):

DTC 23 / (F49) No. 9 (+) — Chassis
ground (

−−−−

):

DTC 25 / (F49) No. 14 (+) — Chassis
ground (

−−−−

):

DTC 27 / (F49) No. 7 (+) — Chassis
ground (

−−−−

):

Is the measured value less than the specified
value?

1 V

Go to step 13.

Repair harness
between
ABSCM&H/U and
ABS sensor.

13

CHECK BATTERY SHORT OF HARNESS.
1) Turn ignition switch to ON.
2) Measure voltage between ABSCM&H/U

connector and chassis ground.

Connector & terminal

DTC 21 / (F49) No. 11 (+) — Chassis
ground (

−−−−

):

DTC 23 / (F49) No. 9 (+) — Chassis
ground (

−−−−

):

DTC 25 / (F49) No. 14 (+) — Chassis
ground (

−−−−

):

DTC 27 / (F49) No. 7 (+) — Chassis
ground (

−−−−

):

Is the measured value less than the speci-
fied value?

1 V

Go to step 14.

Repair harness
between
ABSCM&H/U and
ABS sensor.

14

CHECK INSTALLATION OF ABS SENSOR.
Are the ABS sensor installation bolts tightened
with the specified torque?

33

±

10 N·m (3.4

±

1.0 kgf-m,

25

±

7 ft-lb)

Go to step 15.

Tighten ABS sen-
sor installation
bolts securely.

15

CHECK ABS SENSOR GAP.
Measure tone wheel to ABS sensor piece gap
over entire perimeter of the wheel.
Is the measured value within the specified
range?

Front wheel 0.3 — 0.8 mm
(0.012 — 0.031 in) and Rear
wheel 0.44 — 0.94 mm
(0.0173 — 0.0370 in)

Go to step 16.

Adjust the gap.

NOTE:
Adjust the gap us-
ing spacers (Part
No. 26755AA000).
If spacers cannot
correct the gap, re-
place worn sensor
or worn tone
wheel.

16

CHECK TONE WHEEL RUNOUT.
Measure tone wheel runout.
Is the measured value within the specified
range?

0.05 mm (0.0020 in)

Go to step 17.

Replace tone
wheel. Front:
<Ref. to ABS-19,
Front Tone
Wheel.> Rear:
<Ref. to ABS-20,
Rear Tone
Wheel.>

Step

Value

Yes

No

ABS-92

ABS (DIAGNOSTICS)

DIAGNOSTICS CHART WITH SUBARU SELECT MONITOR

17

CHECK GROUND SHORT OF ABS SENSOR.
1) Turn ignition switch to ON.
2) Measure resistance between ABS sensor

and chassis ground.

Terminal

Front RH No. 1 — Chassis ground:
Front LH No. 1 — Chassis ground:
Rear RH No. 1 — Chassis ground:
Rear LH No. 1 — Chassis ground:

Does the measured value exceed the spec-
ified value?

1 M

Ω

Go to step 18.

Replace ABS sen-
sor and
ABSCM&H/U.
Front: <Ref. to
ABS-12, Front
ABS Sensor.>
Rear: <Ref. to
ABS-15, Rear
ABS Sensor.>
and <Ref. to ABS-
6, ABS Control
Module and
Hydraulic Control
Unit (ABSCM&H/
U).>

18

CHECK GROUND SHORT OF HARNESS.
1) Turn ignition switch to OFF.
2) Connect connector to ABS sensor.
3) Measure resistance between ABSCM&H/U

connector terminal and chassis ground.

Connector & terminal

DTC 21 / (F49) No. 11 — Chassis
ground:
DTC 23 / (F49) No. 9 — Chassis ground:
DTC 25 / (F49) No. 14 — Chassis
ground:
DTC 27 / (F49) No. 7 — Chassis ground:

Does the measured value exceed the spec-
ified value?

1 M

Ω

Go to step 19.

Repair harness
between
ABSCM&H/U and
ABS sensor.
And replace
ABSCM&H/U.
<Ref. to ABS-6,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>

19

CHECK POOR CONTACT IN CONNECTORS.
Is there poor contact in connectors between
ABSCM&H/U and ABS sensor?

There is no poor contact.

Go to step 20.

Repair connector.

20

CHECK ABSCM&H/U.
1) Connect all connectors.
2) Erase the memory.
3) Perform inspection mode.
4) Read out the DTC.

Is the same DTC still being output?

Same DTC is not indicated.

Go to step 21.

Replace
ABSCM&H/U.

21

CHECK ANY OTHER DTC APPEARANCE.
Are other DTC being output?

Other DTC is not indicated.

A temporary poor
contact.

NOTE:
Check harness
and connectors
between AB-
SCM&H/U and
ABS sensor.

Proceed with the
diagnosis corre-
sponding to the
DTC.

Step

Value

Yes

No

ABS-93

ABS (DIAGNOSTICS)

DIAGNOSTICS CHART WITH SUBARU SELECT MONITOR

G: DTC 22 FRONT RIGHT ABNORMAL ABS SENSOR SIGNAL

NOTE:
For the diagnostic procedure, refer to DTC 28. <Ref. to ABS-94, DTC 28 REAR LEFT ABNORMAL ABS
SENSOR SIGNAL, Diagnostics Chart with Subaru Select Monitor.>

H: DTC 24 FRONT LEFT ABNORMAL ABS SENSOR SIGNAL

NOTE:
For the diagnostic procedure, refer to DTC 28. <Ref. to ABS-94, DTC 28 REAR LEFT ABNORMAL ABS
SENSOR SIGNAL, Diagnostics Chart with Subaru Select Monitor.>

I:

DTC 26 REAR RIGHT ABNORMAL ABS SENSOR SIGNAL

NOTE:
For the diagnostic procedure, refer to DTC 28. <Ref. to ABS-94, DTC 28 REAR LEFT ABNORMAL ABS
SENSOR SIGNAL, Diagnostics Chart with Subaru Select Monitor.>