Subaru Legacy 2002 Service Manual page 2400

DIAGNOSTICS CHART WITH SUBARU SELECT MONITOR
No.
11 CHECK ABS SENSOR SIGNAL.
1) Raise all four wheels of ground.
2) Turn ignition switch to OFF.
3) Connect the oscilloscope to the connector.
4) Turn ignition switch to ON.
5) Rotate wheels and measure voltage at
specified frequency.
NOTE:
When this inspection is completed, the
ABSCM&H/U sometimes stores the trouble
code 29.
Connector & terminal
DTC 22 / (B62) No. C5 (+) — No. B5 (−):
DTC 24 / (B62) No. C6 (+) — No. B6 (−):
DTC 26 / (F55) No. 1 (+) — No. 2 (−):
DTC 28 / (F55) No. 4 (+) — No. 5 (−):
12 CHECK CONTAMINATION OF ABS SEN-
SOR OR TONE WHEEL.
Remove disc rotor from hub in accordance
with diagnostic trouble code.
13 CHECK DAMAGE OF ABS SENSOR OR
TONE WHEEL.
14 CHECK TONE WHEEL RUNOUT.
Measure tone wheel runout.
15 CHECK RESISTANCE OF ABS SENSOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from ABS sensor.
3) Measure resistance between ABS sensor
connector 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:
Step
Is oscilloscope pattern
smooth, as shown in fig-
ure?
Is the ABS sensor piece or
the tone wheel contami-
nated by dirt or other for-
eign matter?
Are there broken or dam-
aged in the ABS sensor
piece or the tone wheel?
Is the runout less than 0.05
mm (0.0020 in)?
Is the resistance between 1
and 1.5 kΩ?
ABS-99
Check Yes
Go to step 15.
Thoroughly
remove dirt or
other foreign mat-
ter.
Replace ABS sen-
sor or tone wheel.
Front: <Ref. to
ABS-12, Front
ABS Sensor.>
Rear: <Ref. to
ABS-15, Rear
ABS Sensor.> and
Front: <Ref. to
ABS-20, Front
Tone Wheel.>
Rear: <Ref. to
ABS-21, Rear
Tone Wheel.>
Go to step 15.
Go to step 16.
ABS (Diagnostics)
No
Go to step 12.
Go to step 13.
Go to step 14.
Replace tone
wheel. Front:
<Ref. to ABS-20,
Front Tone
Wheel.> Rear:
<Ref. to ABS-21,
Rear Tone
Wheel.>
Replace ABS sen-
sor. Front: <Ref.
to ABS-12, Front
ABS Sensor.>
Rear: <Ref. to
ABS-15, Rear
ABS Sensor.>