Subaru IMPREZA 2002 Service Manual page 295

DIAGNOSTICS CHART WITH SUBARU SELECT MONITOR
ABS (DIAGNOSTICS)
Yes
io to step 16.
20 to step 17.
20
to step 18.
30 to step 19.
3epair the con-
lector.
3eplace the
4BSCM&H/U.
Droceed with the
diagnosis corre-
sponding to the
jiagnostic trouble
:ode.
Step
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
No
Adjust the gap.
NOTE:
Adjust the gap us.
ing spacers (Pad
No. 26755AAOOO).
If spacers cannol
correct the gap, re-
place the worr
sensor or wow
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-14, 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).>
Repair harness
between
ABSCM&H/U and
ABS sensor.
And replace the
ABSCM&H/U.
<Ref. to ABS-7,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
Go to step 20.
Go to step 21.
A temporary poor
contact.
NOTE:
Check harnes!
and connector!
between AB
SCM&H/U anc
ABS sensor.
CHECK TONE WHEEL RUNOUT.
Measure the tone wheel runout.
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 GROUND SHORT OF HARNESS.
1)Turn the ignition switch to OFF.
2)Connect the connector to ABS sensor.
3)Measure the resistance between
ABSCM&H/U connector terminal 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:
CHECK POOR CONTACT IN CONNECTORS
CHECK ABSCM&H/U.
1 )Connect all connectors.
2)Erase the memory.
3)Perform the inspection mode.
4)Read out the diagnostic trouble code.
CHECK ANY OTHER DIAGNOSTIC TROU-
BLE CODES APPEARANCE.
~
Check
;the gap within the specifica-
ons?
3
the runout less than 0.05
nm (0.0020 in)?
s the resistance more than 1
A n ?
s the resistance more than 1
nn?
s
there poor contact in con-
lectors between ABSCM&H/U
md ABS sensor?
s
the same diagnostic trouble
;ode as in the current diagno-
;is still being output?
4re other diagnostic trouble
:odes being output?
ABS-I 09