Subaru LEGACY 2003 Service Manual page 43

DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
Step
1 CHECK ABS SENSOR.
1) Turn ignition switch to OFF.
2) Disconnect connector from ABS sensor.
3) Measure resistance of ABS sensor connec-
tor terminals.
Terminal
Front RH No. 1 — No. 2:
Front LH No. 1 — No. 2:
Rear RH No. 1 — No. 2:
Rear LH No. 1 — No. 2:
Is the measured value within the specified
range?
2 CHECK BATTERY SHORT OF ABS SEN-
SOR.
1) Disconnect connector from ABSCM&H/U.
2) Measure voltage between ABS sensor 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 ( − − − −
):
Is the measured value less than the speci-
fied value?
3 CHECK BATTERY SHORT OF ABS SEN-
SOR.
1) Turn ignition switch to ON.
2) Measure voltage between ABS sensor 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 ( − − − −
):
Is the measured value less than the speci-
fied value?
4 CHECK HARNESS/CONNECTOR BETWEEN
ABSCM&H/U AND ABS SENSOR.
1) Turn ignition switch to OFF.
2) Connect connector to ABS sensor.
3) Measure resistance between ABSCM&H/U
connector terminals.
Connector & terminal
DTC 21 / (F49) No. 11 — No. 12:
DTC 23 / (F49) No. 9 — No. 10:
DTC 25 / (F49) No. 14 — No. 15:
DTC 27 / (F49) No. 7 — No. 8:
Is the measured value within the specified
range?
Value
1 - 1.5 kΩ
1 V
1 V
1 - 1.5 kΩ
ABS-41
ABS (DIAGNOSTICS)
Yes
Go to step 2. Replace ABS sen-
sor. Front: <Ref.
to ABS-12, Front
ABS Sensor.>
Rear: <Ref. to
ABS-15, Rear
ABS Sensor.>
Go to step 3. Replace ABS sen-
sor. Front: <Ref.
to ABS-12, Front
ABS Sensor.>
Rear: <Ref. to
ABS-15, Rear
ABS Sensor.>
Go to step 4. Replace ABS sen-
sor. Front: <Ref.
to ABS-12, Front
ABS Sensor.>
Rear: <Ref. to
ABS-15, Rear
ABS Sensor.>
Go to step 5. Repair harness/
connector
between
ABSCM&H/U and
ABS sensor.
No