Subaru Impreza 2003 Service Manual page 2448

DIAGNOSTICS PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)
ABS (DIAGNOSTICS)
Step
1 CHECK OUTPUT OF ABS WHEEL SPEED
SENSOR USING SUBARU SELECT MONI-
TOR.
1)Select "Current data display & Save" on the
Subaru Select Monitor.
2)Read the ABS wheel speed sensor output
corresponding to faulty system in the Subaru
Select Monitor data display mode.
2 CHECK INSTALLATION OF ABS WHEEL
SPEED SENSOR.
3 CHECK ABS WHEEL SPEED SENSOR GAP.
Measure the tone wheel to ABS wheel speed
sensor piece gap over entire perimeter of the
wheel.
4 CHECK TONE WHEEL RUNOUT.
Measure the tone wheel runout.
5 CHECK POOR CONTACT IN CONNECTORS.
Turn the ignition switch to OFF.
6 CHECK ABSCM&H/U.
1)Connect all connectors.
2)Erase the memory.
3)Perform the inspection mode.
4)Read out the DTC.
7 CHECK ANY OTHER DTC APPEARANCE.
Check
Does the speed indicated on
display change in response to
speedometer reading during
acceleration/deceleration
when the steering wheel is in
straight-ahead position?
Are the ABS wheel speed sen-
sor installation bolts tightened
33 N·m (3.3 kgf-m, 24 ft-lb)?
Is the gap as following value?
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 there poor contact in con-
nectors between ABSCM&H/U
and ABS wheel speed sensor?
Is the same DTC as in the cur-
rent diagnosis still being out-
put?
Are other DTCs being output? Proceed with the
ABS-108
Yes
Go to step 2. Go to step 8.
Go to step 3. Tighten the ABS
wheel speed sen-
sor installation
bolts securely.
Go to step 4. Adjust the gap.
NOTE:
Adjust the gap us-
ing spacers (Part
No. 26755AA000).
If the spacers can-
not correct gap, re-
place worn sensor
or worn
wheel.
Go to step 5. Replace the tone
wheel. Front:
<Ref. to ABS-19,
Front Tone
Wheel.> Rear:
<Ref. to ABS-20,
Rear Tone
Wheel.>
Repair the con- Go to step 6.
nector.
Replace the Go to step 7.
ABSCM&H/U.
<Ref. to ABS-7,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
A temporary poor
diagnosis corre- contact.
sponding to DTC.
NOTE:
Check the harness
and
between
SCM&H/U
ABS wheel speed
sensor.
No
tone
connectors
AB-
and