Subaru Legacy III (2000-2003 year). Service manual — part 706
ABS-42
ABS (DIAGNOSTICS)
DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
5
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
Repair harness
between
ABSCM&H/U and
ABS sensor.
6
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
Repair harness
between
ABSCM&H/U and
ABS sensor.
7
CHECK INSTALLATION OF ABS SENSOR.
Turn ignition switch to OFF.
Are the ABS sensor installation bolts tightened
with the specified torque?
33 N·m (3.4 kgf-m, 25 ft-lb)
Tighten ABS sen-
sor installation
bolts securely.
8
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)
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.
9
CHECK TONE WHEEL RUNOUT.
Measure tone wheel runout.
Is the measured value less than the specified
value?
0.05 mm (0.0020 in)
Replace tone
wheel. Front:
<Ref. to ABS-19,
Front Tone
Wheel.> Rear:
<Ref. to ABS-20,
Rear Tone
Wheel.>
Step
Value
Yes
No
ABS-43
ABS (DIAGNOSTICS)
DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
10
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
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).>
11
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
Repair harness
between
ABSCM&H/U and
ABS sensor.
Replace
ABSCM&H/U.
<Ref. to ABS-6,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
12
CHECK POOR CONTACT IN CONNECTORS.
Is there poor contact in connectors between
ABSCM&H/U and ABS sensor?
There is no poor contact.
Repair connector.
13
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.
Replace
ABSCM&H/U.
<Ref. to ABS-6,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
14
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-44
ABS (DIAGNOSTICS)
DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
H: DTC 22 ABNORMAL ABS SENSOR (FRONT RH)
NOTE:
For the diagnostic procedure, refer to DTC 28. <Ref. to ABS-46, DTC 28 ABNORMAL ABS SENSOR (REAR
LH), Diagnostics Chart with Diagnosis Connector.>
I:
DTC 24 ABNORMAL ABS SENSOR (FRONT LH)
NOTE:
For the diagnostic procedure, refer to DTC 28. <Ref. to ABS-46, DTC 28 ABNORMAL ABS SENSOR (REAR
LH), Diagnostics Chart with Diagnosis Connector.>
J: DTC 26 ABNORMAL ABS SENSOR (REAR RH)
NOTE:
For the diagnostic procedure, refer to DTC 28. <Ref. to ABS-46, DTC 28 ABNORMAL ABS SENSOR (REAR
LH), Diagnostics Chart with Diagnosis Connector.>
ABS-45
ABS (DIAGNOSTICS)
DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
MEMO:
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