Subaru 2002 IMPREZA Service Manual page 2142

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
ABS (DIAGNOSTICS)
Step
8 CHECK ABS SENSOR GAP.
Measure the 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)
9 CHECK TONE WHEEL RUNOUT.
Measure the tone wheel runout.
10 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:
11 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 / LHD: (B301) No. 11 — Chassis
ground:
RHD: (F49) No. 11 — Chassis ground:
DTC 23 / LHD: (B301) No. 9 — Chassis
ground:
RHD: (F49) No. 9 — Chassis ground:
DTC 25 / LHD: (B301) No. 14 — Chassis
ground:
RHD: (F49) No. 14 — Chassis ground:
DTC 27 / LHD: (B301) No. 7 — Chassis
ground:
RHD: (F49) No. 7 — Chassis ground:
12 CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in con-
Check
Is the gap within the specifica-
tions?
Is the runout less than 0.05
mm (0.0020 in)?
Is the resistance more than 1
MΩ?
Is the resistance more than 1
MΩ?
nectors between ABSCM&H/U
and ABS sensor?
ABS-44
Yes
Go to step 9. 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 10. Replace the tone
wheel. Front:
<Ref. to ABS-20,
Front Tone
Wheel.> Rear:
<Ref. to ABS-21,
Rear Tone
Wheel.>
Go to step 11. Replace the ABS
sensor 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 Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
Go to step 12. Repair the har-
ness between
ABSCM&H/U and
ABS sensor.
Replace the
ABSCM&H/U.
<Ref. to ABS-7,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
Repair the con- Go to step 13.
nector.
No
tone