Subaru Forester 2004 Service Manual page 60

Diagnostics Procedure without Diagnostic Trouble Code (DTC)
Step
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:
11 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:
12 CHECK GROUND CIRCUIT OF ABSCM&H/U.
Measure the resistance between ABSCM&H/U
and chassis ground.
Connector & terminal
(B301) No. 23 — Chassis ground:
13 CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in con-
14 CHECK SOURCES OF SIGNAL NOISE.
15 CHECK SOURCES OF SIGNAL NOISE.
Check
Is the resistance the following
value?
Front: 1 — 1.5 kΩ
Rear: 1.025 — 1.265 kΩ
Is the resistance more than 1
MΩ?
Is the resistance less than 0.5
Ω?
nectors between ABSCM&H/U
and ABS wheel speed sensor?
Is the car phone or wireless
transmitter properly installed?
Are noise sources (such as an
antenna) installed near the
sensor harness?
ABS-59
ABS (DIAGNOSTIC)
Yes
Go to step 11. Repair the har-
ness connector
between
ABSCM&H/U and
ABS wheel speed
sensor.
Go to step 12. Repair the har-
ness connector
between
ABSCM&H/U and
ABS wheel speed
sensor.
Go to step 13. Repair the
ABSCM&H/U
ground harness.
Repair the con- Go to step 14.
nector.
Go to step 15. Properly install the
car phone or wire-
less transmitter.
Install the noise Go to step 16.
sources apart from
sensor harness.
No