Subaru Legacy 2003 Service Manual page 2893

DIAGNOSTICS CHART WITH SUBARU SELECT MONITOR
ABS (DIAGNOSTICS)
8 CHECK ABS SENSOR SIGNAL.
1) Lift up the vehicle.
2) Turn ignition switch to OFF.
3) Connect the oscilloscope to the connector
(B62) in accordance with trouble code.
4) Turn ignition switch to ON.
5) Rotate wheels and measure voltage at
specified frequency. <Ref. to ABS-15,
WAVEFORM, Control Module I/O Signal.>
NOTE:
When this inspection is completed, the AB-
SCM&H/U sometimes stores the DTC 29.
Connector & terminal
Front RH
LHD: (F45) No. 11 (+) — No. 12 ( − − − − ) :
RHD: (F2) No. 12 (+) — No. 13 ( − − − − ) :
Front LH
LHD: (F45) No. 8 (+) — No. 9 ( − − − − ) :
RHD: (F2) No. 15 (+) — No. 16 ( − − − − ) :
Rear RH
(F55) No. 5 (+) — No. 6 ( − − − − ) :
Rear LH
(F55) No. 1 (+) — No. 4 ( − − − − ) :
Is the measured value same as the speci-
fied value?
9 CHECK CONTAMINATION OF ABS SENSOR
OR TONE WHEEL.
Remove disc rotor from hub.
Is the ABS sensor piece or the tone wheel con-
taminated by mud or other foreign matter?
10 CHECK DAMAGE OF ABS SENSOR OR
TONE WHEEL.
Are there broken or damaged teeth in the ABS
sensor piece or the tone wheel?
11 CHECK TONE WHEEL RUNOUT.
Measure tone wheel runout.
Is the measured value less than the specified
value?
12 CHECK ABSCM&H/U.
1) Turn ignition switch to OFF.
2) Connect all connectors.
3) Erase the memory.
4) Perform inspection mode.
5) Read out the DTC.
Is the same DTC still being output?
Step Value
Oscilloscope pattern is as
shown in figure.
ABS sensor piece or the tone
wheel is not contaminated.
Not broken or damaged.
0.05 mm (0.0020 in)
Same DTC is not indicated.
ABS-102
Yes
Go to step 12. Go to step 9.
Go to step 10. Thoroughly
remove mud or
other foreign mat-
ter.
Go to step 11. 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-19, Front
Tone Wheel.>
Rear: <Ref. to
ABS-20, Rear
Tone Wheel.>
Go to step 12. Replace tone
wheel. Front:
<Ref. to ABS-19,
Front Tone
Wheel.> Rear:
<Ref. to ABS-20,
Rear Tone
Wheel.>
Go to step 13. Replace
ABSCM&H/U.
<Ref. to ABS-6,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
No