Subaru Impreza 2003 Service Manual page 2396

DIAGNOSTICS PROCEDURE WITHOUT DIAGNOSTIC TROUBLE CODE (DTC)
ABS (DIAGNOSTICS)
Step
7 CHECK TONE WHEEL RUNOUT.
Measure the tone wheel runout.
8 CHECK RESISTANCE OF ABS WHEEL
SPEED SENSOR.
1)Turn the ignition switch to OFF.
2)Disconnect the connector from ABS wheel
speed sensor.
3)Measure the resistance between ABS wheel
speed sensor connector terminals while shak-
ing the harness lightly.
Terminals
Front RH No. 1 — No. 2:
Front LH No. 1 — No. 2:
Rear RH No. 1 — No. 2:
Rear LH No. 1 — No. 2:
9 CHECK GROUND SHORT OF ABS WHEEL
SPEED SENSOR.
Measure the resistance between ABS wheel
speed sensor and chassis ground.
Terminals
Front RH No. 1 — Chassis ground:
Front LH No. 1 — Chassis ground:
Rear RH No. 1 — Chassis ground:
Rear LH No. 1 — Chassis ground:
10 CHECK HARNESS/CONNECTOR BETWEEN
ABSCM&H/U AND ABS WHEEL SPEED
SENSOR.
1)Connect the connector to ABS wheel speed
sensor.
2)Disconnect the connector from ABSCM&
H/U.
3)Measure the resistance at ABSCM&H/U
connector terminals.
Connector & terminal
DTC 22
LHD: (B301) No. 11 — No. 12:
RHD: (F49) No. 11 — No. 12:
DTC 24
LHD: (B301) No. 9 — No. 10:
RHD: (F49) No. 9 — No. 10:
DTC 26
LHD: (B301) No. 14 — No. 15:
RHD: (F49) No. 14 — No. 15:
DTC 28
LHD: (B301) No. 7 — No. 8:
RHD: (F49) No. 7 — No. 8:
Check
Is the runout less than 0.05
mm (0.0020 in)?
Is the resistance as following
value?
Front: 1 — 1.5 kΩ
Rear: 1.025 — 1.265 kΩ
Is the resistance more than 1
MΩ?
Is the resistance as following
value?
Front: 1 — 1.5 kΩ
Rear: 1.025 — 1.265 kΩ
ABS-56
Yes
Go to step 8. Replace the tone
wheel. Front:
<Ref. to ABS-19,
Front Tone
Wheel.> Rear:
<Ref. to ABS-20,
Rear Tone
Wheel.>
Go to step 9. Replace the ABS
wheel speed sen-
sor. Front: <Ref. to
ABS-13, Front
ABS Wheel Speed
Sensor.> Rear:
<Ref. to ABS-16,
Rear ABS Wheel
Speed Sensor.>
Go to step 10. Replace the ABS
wheel speed sen-
sor. Front: <Ref. to
ABS-13, Front
ABS Wheel Speed
Sensor.> Rear:
<Ref. to ABS-16,
Rear ABS Wheel
Speed Sensor.>
Go to step 11. Repair the har-
ness/connector
between
ABSCM&H/U and
ABS wheel speed
sensor.
No