Subaru IMPREZA 2002 Service Manual page 230

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
ABS (DIAGNOSTICS)
Step
i CHECK BAlTERY 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 /(F49) No.
11
(+)
-
Chassis
ground (-):
DTC 23 / (F49) No. 9 (+)
-
Chassis
ground (-):
DTC 25 / (F49) No. 14 (+)
-
Chassis
ground (-):
DTC 27/ (F49) No. 7 (+)
-
Chassis
ground ( - ) :
r
CHECK INSTALLATION OF ABS SENSOR.
Turn the ignition switch to OFF.
32 N.m (3.3 kgf-m, 24 ft-lb)
Tightening torque:
$
CHECK ABS SENSOR GAP.
Measure the tone wheel to ABS sensor piece
gap over entire perimeter of the wheel.
0.3
-
0.8 mm (0.012
-
0.031 in)
0.7
-
1.2 mm (0.028
-
0.047 in)
Front wheel
Rear wheel
b
CHECK TONE WHEEL RUNOUT.
Measure the tone wheel runout.
1 0
CHECK GROUND SHORT OF ABS SENSOR.
1)Turn the ignition switch to ON.
2)Measure the resistance between ABS sen-
sor 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:
Check
s the voltage less than 1 V?
Are the ABS sensor installation
Iolts tightened securely?
s the gap within the specifica-
ions?
s the runout less than 0.05
nm (0.0020 in)?
s the resistance more than 1
dR?
Yes
; o to step 7.
20 to step 8.
20
to step 9.
20 to step 10.
20 to step
11.
No
Repair harness
between
ABSCM&H/U and
ABS sensor.
Tighten the ABS
sensor installation
bolts securely.
Adjust the gap.
NOTE:
Adjust the gap u s
ing spacers (Par
No. 26755AA000)
If spacers canno
correct the gap, re.
place worn sensoi
or worn tone
wheel.
Replace the tone
wheel. Front:
<Ref. to ABS-21,
Front Tone
Wheel.> Rear:
<Ref. to ABS-22,
Rear Tone
Wheel.>
Replace the ABS
sensor and
ABSCM&H/U.
Front: <Ref. to
ABS-1 4, Front
ABS Sensor.>
Rear: <Ref. to
ABS-18, Rear
ABS Sensor.>
and <Ref. to
ABS-7, ABS Con-
trol Module and
Hydraulic Control
Unit (ABSCM&H/
U).>
ABS-44