Subaru IMPREZA 2001 - Page 45

ABS-44
ABS (DIAGNOSTICS)
DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
6 CHECK BATTERY SHORT OF HARNESS.
1)Turn ignition switch to ON.
2)Measure voltage between ABSCM&H/U con-
nector and chassis ground.
Connector & terminal
Trouble code 21 / (F49) No. 11 (+) —
Chassis ground (
−
−−
− ):
Trouble code 23 / (F49) No. 9 (+) — Chas-
sis ground ( −
−−
− ):
Trouble code 25 / (F49) No. 14 (+) —
Chassis ground ( −
−−
− ):
Trouble code 27 / (F49) No. 7 (+) — Chas-
sis ground ( −
−−
− ):
Is the voltage less than 1 V? Go to step
7.
Repair harness
between
ABSCM&H/U and
ABS sensor.
7 CHECK INSTALLATION OF ABS SENSOR.
Turn ignition switch to OFF.
Tightening torque:
32 N·m (3.3 kgf-m, 24 ft-lb)
Are the ABS sensor installation
bolts tightened securely?
Go to step
8.
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.
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 gap within the specifica-
tions?
Go to step
9.
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 runout less than 0.05
mm (0.0020 in)?
Go to step
10.
Replace tone
wheel. Front:
<Ref. to ABS-20,
Front Tone
Wheel.> Rear:
<Ref. to ABS-21,
Rear Tone
Wheel.>
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:
Is the resistance more than 1
M
Ω
?
Go to step
11.
Replace ABS sen-
sor and
ABSCM&H/U.
Front: <Ref. to
ABS-14, Front
ABS Sensor.>
Rear: <Ref. to
ABS-17, Rear
ABS Sensor.>
and <Ref. to
ABS-7, ABS Con-
trol Module and
Hydraulic Control
Unit (ABSCM&H/
U).>
Step Check Yes No