Subaru IMPREZA 2002 Service Manual page 299

DIAGNOSTICS CHART WITH SUBARU SELECT MONITOR
ABS (DIAGNOSTICS)
~
Step
CHECK OUTPUT OF ABS SENSOR USING
SELECT MONITOR.
1)Select "Current data display & Save" on the
select monitor.
2)Read the ABS sensor output corresponding
to the faulty system in the select monitor data
display mode.
CHECK POOR CONTACT IN CONNECTORS.
Turn the ignition switch to OFF.
1
CHECK SOURCES OF SIGNAL NOISE.
CHECK SOURCES OF SIGNAL NOISE.
I
CHECK SHIELD CIRCUIT.
1)Turn the ignition switch to OFF.
02)Connect all connectors.
3)Measure the resistance between shield con-
nector and chassis ground.
Connector & terminal
DTC 26 / (B200) No. 11
-
Chassis
ground:
DTC 28 / (8200) No. 3
-
Chassis ground.
NOTE:
For the DTC 22 and 24:
Go to step 6 .
i CHECK ABSCM&HIU.
1)Connect all connectors.
2)Erase the memory.
3)Perform the inspection mode.
4)Read out the diagnostic trouble code.
r
CHECK ANY OTHER DIAGNOSTIC TROU-
BLE CODES APPEARANCE.
I CHECK INSTALLATION OF ABS SENSOR.
Tightening torque:
32 N.m (3.3 kgf-m, 24 ft-lb)
3 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" (0.028-0.047in)
Front wheel
.
Rearwheel
IO PREPARE OSCILLOSCOPE.
Check
Ioes the speed indicated on
he display change in response
o the speedometer reading
luring acceleration/decelera-
ion when the steering wheel is
n the straight-ahead position?
s there poor contact in con-
lectors between ABSCM&H/U
ind ABS sensor?
s the car telephone or the
vireless transmitter properly
nstalled?
4re noise sources (such as an
mtenna) installed near the
iensor harness?
s the resistance less than 0.5
3?
s the same diagnostic trouble
:ode as in the current diagno-
sis still being output?
4re other diagnostic trouble
:odes being output?
4re the ABS sensor installation
iolts tightened securely?
Is
the gap within the specifica-
!ions?
Is an oscilloscope available?
~~
Yes
io to step 2.
iepair the con-
lector.
i o to step 4.
istall the noise
8ources apart from
l e sensor har-
less.
S o to step 6.
3eplace the
4BSCM&H/U.
:Ref. to ABS-7,
4BS Control Mod-
rle and Hydraulic
2ontrol Unit
ABSCM&H/U).>
'roceed with the
iiagnosis corre-
;ponding to the
iiagnostic trouble
:ode.
; o to step 9.
; o to step 10.
30 to step 11.
No
i o to step 8.
S o to step
3 .
'roperly install the
:ar telephone or
he wireless trans-
nitter.
; o to step 5.
3epair the shield
iarness.
30
to step 7.
1 temporary noise
nterference.
righten the ABS
sensor installation
iolts securely.
4djust the gap.
VOTE:
4djust the gap us.
ng spacer (Par
10.
26755AA000)
f spacers canno
:orrect the gap, re-
ilace the worn
sensor or worn
:one wheel.
ABS-I 13