Subaru IMPREZA GD 2007 Series Manual page 3169

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ABS (DIAGNOSTICS)
Step
13 CHECK BATTERY SHORT OF HARNESS.
1) Turn the ignition switch to ON.
2) Measure the voltage between ABSCM&H/U
connector and chassis ground.
Connector & terminal
DTC 21
(B301) No. 6 (+) — Chassis ground (–):
DTC 23
(B301) No. 1 (+) — Chassis ground (–):
DTC 25
(B301) No. 19 (+) — Chassis ground (–):
DTC 27
(B301) No. 3 (+) — Chassis ground (–):
14 CHECK INSTALLATION OF ABS WHEEL
SPEED SENSOR.
15 CHECK ABS WHEEL SPEED SENSOR GAP.
Measure the gap between the ABS wheel
speed sensor protrusion and tone wheel.
16 CHECK TONE WHEEL RUNOUT.
Measure the tone wheel runout.
17 CHECK GROUND SHORT OF ABS WHEEL
SPEED SENSOR.
1) Turn the ignition switch to ON.
2) Measure the resistance between ABS
wheel speed sensor and chassis ground.
Terminals
Front RH No. 1 — Chassis ground:
Front LH No. 1 — Chassis ground:
Rear RH No. 1 — Chassis ground:
Rear LH No. 1 — Chassis ground:
Check
Is the voltage less than 1 V?
Is the ABS wheel speed sensor
installation bolt tightened 33
N·m (3.3 kgf-m, 24 ft-lb)?
Is the gap within the following?
Front wheel: 0.3 — 0.8 mm
(0.012 — 0.031 in), Rear
wheel: 0.7 — 1.2 mm
(0.028 — 0.047 in)
Is the runout less than 0.05 mm
(0.0020 in)?
Is the resistance 1 MΩ or
more?
ABS(diag)-40
Yes No
Go to step 14. Repair the harness
between
ABSCM&H/U and
ABS wheel speed
sensor.
Go to step 15.
Tighten the ABS
wheel speed sen-
sor installation
bolts.
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 the
sensor or
tone wheel.
Go to step 17. Replace the tone
wheel. Front: <Ref.
to ABS-18, Front
Tone Wheel.>
Rear: <Ref. to
ABS-19, Rear
Tone Wheel.>
Go to step 18. Replace the
ABSCM&H/U and
ABS wheel speed
sensor. Front:
<Ref. to ABS-13,
Front ABS Wheel
Speed Sensor.>
Rear: <Ref. to
ABS-16, Rear ABS
Wheel Speed Sen-
sor.> and <Ref. to
ABS-6, ABS Con-
trol Module and
Hydraulic Control
Unit (ABSCM&H/
U).>
worn
worn