Subaru Legacy III (2000-2003 year). Service manual — part 775
VDC-136
VDC (DIAGNOSTICS)
DIAGNOSTICS CHART WITH 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?
1.0 — 1.5 k
Ω
Replace ABS sen-
sor. Front <Ref. to
VDC-27, Front
ABS Sensor.>
Rear <Ref. to
VDC-28, Rear
ABS Sensor.>
9
CHECK BATTERY SHORT OF ABS SEN-
SOR.
1) Disconnect connector from VDCCM.
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
Replace ABS sen-
sor. Front <Ref. to
VDC-27, Front
ABS Sensor.>
Rear <Ref. to
VDC-28, 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
Replace ABS sen-
sor. Front <Ref. to
VDC-27, Front
ABS Sensor.>
Rear <Ref. to
VDC-28, Rear
ABS Sensor.>
11
CHECK HARNESS/CONNECTOR BETWEEN
VDCCM AND ABS SENSOR.
1) Turn ignition switch to OFF.
2) Connect connector to ABS sensor.
3) Measure resistance between VDCCM con-
nector terminals.
Connector & terminal
DTC 21 / (F87) No. 14 — No. 15:
DTC 23 / (F87) No. 49 — No. 19:
DTC 25 / (F87) No. 18 — No. 46:
DTC 27 / (F87) No. 16 — No. 17:
Is the measured value within the specified
range?
1.0 — 1.5 k
Ω
Repair harness/
connector
between VDCCM
and ABS sensor.
Step
Value
Yes
No
VDC-137
VDC (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SELECT MONITOR
12
CHECK BATTERY SHORT OF HARNESS.
Measure voltage between VDCCM connector
and chassis ground.
Connector & terminal
DTC 21 / (F87) No. 14 (+) — Chassis
ground (
−−−−
):
DTC 23 / (F87) No. 49 (+) — Chassis
ground (
−−−−
):
DTC 25 / (F87) No. 18 (+) — Chassis
ground (
−−−−
):
DTC 27 / (F87) No. 16 (+) — Chassis
ground (
−−−−
):
Is the measured value less than the specified
value?
1 V
Repair harness
between VDCCM
and ABS sensor.
13
CHECK BATTERY SHORT OF HARNESS.
1) Turn ignition switch to ON.
2) Measure voltage between VDCCM connec-
tor and chassis ground.
Connector & terminal
DTC 21 / (F87) No. 14 (+) — Chassis
ground (
−−−−
):
DTC 23 / (F87) No. 49 (+) — Chassis
ground (
−−−−
):
DTC 25 / (F87) No. 18 (+) — Chassis
ground (
−−−−
):
DTC 27 / (F87) No. 16 (+) — Chassis
ground (
−−−−
):
Is the measured value less than the speci-
fied value?
1 V
Repair harness
between VDCCM
and ABS sensor.
14
CHECK INSTALLATION OF ABS SENSOR.
Are the ABS sensor installation bolts tightened
securely?
Tightening torque:
33
±±±±
10 N·m (3.3
±±±±
1.0 kgf-m, 24
±±±±
7 ft-lb)
Tightened securely.
Tighten ABS sen-
sor installation
bolts securely.
15
CHECK ABS SENSOR GAP.
Measure tone wheel-to-pole 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.
16
CHECK HUB AND TONE WHEEL RUNOUT.
Measure hub and tone wheel runout.
Is the measured value less than the specified
value?
0.05 mm (0.0020 in)
Repair hub and
tone wheel. Front
<Ref. to VDC-27,
Front ABS Sen-
sor.> Rear <Ref.
to VDC-28, Rear
ABS Sensor.>
17
CHECK POOR CONTACT IN CONNECTORS.
Is there poor contact in connectors between
VDCCM and ABS sensor?
There is poor contact.
Repair connector.
Step
Value
Yes
No
VDC-138
VDC (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SELECT MONITOR
18
CHECK VDCCM.
1) Connect all connectors.
2) Erase the memory.
3) Perform inspection mode.
4) Read out the diagnostic trouble code.
Is the same diagnostic trouble code as in
the current diagnosis still being output?
Same pattern.
Replace VDCCM.
<Ref. to VDC-8,
VDC Control Mod-
ule (VDCCM).>
19
CHECK ANY OTHER DIAGNOSTIC TROU-
BLE CODES APPEARANCE.
Are other diagnostic trouble codes being out-
put?
Other DTC indicated.
Proceed with the
diagnosis corre-
sponding to the
diagnostic trouble
code.
A temporary poor
contact.
NOTE:
Check harness
and connectors
between VDCCM
and ABS sensor.
Step
Value
Yes
No
VDC-139
VDC (DIAGNOSTICS)
DIAGNOSTICS CHART WITH SELECT MONITOR
F: DTC 22 FRONT RIGHT ABS SENSOR SIGNAL
NOTE:
For diagnostic procedure, refer to DTC 28. <Ref. to VDC-140, DTC 28 REAR LEFT ABS SENSOR SIGNAL,
Diagnostics Chart with Select Monitor.>
G: DTC 24 FRONT LEFT ABS SENSOR SIGNAL
NOTE:
For diagnostic procedure, refer to DTC 28. <Ref. to VDC-140, DTC 28 REAR LEFT ABS SENSOR SIGNAL,
Diagnostics Chart with Select Monitor.>
H: DTC 26 REAR RIGHT ABS SENSOR SIGNAL
NOTE:
For diagnostic procedure, refer to DTC 28. <Ref. to VDC-140, DTC 28 REAR LEFT ABS SENSOR SIGNAL,
Diagnostics Chart with Select Monitor.>
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