Subaru 2002 IMPREZA Service Manual page 2210

DIAGNOSTICS CHART WITH SUBARU SELECT MONITOR
ABS (DIAGNOSTICS)
Step
16 CHECK GROUND SHORT OF ABS SENSOR.
Measure the resistance 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:
17 CHECK HARNESS/CONNECTOR BETWEEN
ABSCM&H/U AND ABS SENSOR.
1)Connect the connector to ABS 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:
18 CHECK GROUND SHORT OF HARNESS.
Measure the resistance between ABSCM&H/U
connector and chassis ground.
Connector & terminal
DTC 22 /
LHD: (B301) No. 11 — Chassis ground:
RHD: (F49) No. 11 — Chassis ground:
DTC 24 /
LHD: (B301) No. 9 — Chassis ground:
RHD: (F49) No. 9 — Chassis ground:
DTC 26 /
LHD: (B301) No. 14 — Chassis ground:
RHD: (F49) No. 14 — Chassis ground:
DTC 28 /
LHD: (B301) No. 7 — Chassis ground:
RHD: (F49) No. 7 — Chassis ground:
19 CHECK GROUND CIRCUIT OF ABSCM&H/U.
Measure the resistance between ABSCM&H/U
and chassis ground.
Connector & terminal
LHD: (B301) No. 23 — Chassis ground:
RHD: (F49) No. 23 — Chassis ground:
20 CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in con-
21 CHECK SOURCES OF SIGNAL NOISE.
22 CHECK SOURCES OF SIGNAL NOISE.
Check
Is the resistance more than 1
MΩ?
Is the resistance between 1
and 1.5 kΩ?
Is the resistance more than 1
MΩ?
Is the resistance less than 0.5
Ω?
nectors between ABSCM&H/U
and ABS sensor?
Is the car telephone or the
wireless transmitter properly
installed?
Are noise sources (such as an
antenna) installed near the
sensor harness?
ABS-112
Yes
Go to step 17. Replace the ABS
sensor. Front:
<Ref. to ABS-14,
Front ABS Sen-
sor.> Rear: <Ref.
to ABS-17, Rear
ABS Sensor.>
Go to step 18. Repair the har-
ness/connector
between
ABSCM&H/U and
ABS sensor.
Go to step 19. Repair the har-
ness/connector
between
ABSCM&H/U and
ABS sensor.
Go to step 20. Repair the
ABSCM&H/U
ground harness.
Repair the con- Go to step 21.
nector.
Go to step 22. Properly install the
car telephone or
wireless transmit-
ter.
Install the noise Go to step 23.
sources apart from
sensor harness.
No