Subaru 2002 IMPREZA Service Manual page 2203

DIAGNOSTICS CHART WITH SUBARU SELECT MONITOR
Step
13 CHECK BATTERY 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 /
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
( − − − − ):
14 CHECK INSTALLATION OF ABS SENSOR.
Tightening torque:
32 N·m (3.3 kgf-m, 24 ft-lb)
15 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)
16 CHECK TONE WHEEL RUNOUT.
Measure the tone wheel runout.
17 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
Is the voltage less than 1 V?
Are the ABS sensor installation
bolts tightened securely?
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?
ABS-105
ABS (DIAGNOSTICS)
Yes
Go to step 14. Repair the har-
ness between
ABSCM&H/U and
ABS sensor.
Go to step 15. Tighten the ABS
sensor installation
bolts securely.
Go to step 16. 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 17. Replace the tone
wheel. Front:
<Ref. to ABS-20,
Front Tone
Wheel.> Rear:
<Ref. to ABS-21,
Rear Tone
Wheel.>
Go to step 18. 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).>
No
tone