Subaru Forester 2004 Service Manual page 109

Diagnostics Procedure with Diagnostic Trouble Code (DTC)
ABS (DIAGNOSTIC)
Step
15 CHECK ABS WHEEL SPEED SENSOR GAP.
Measure the tone wheel to ABS wheel speed
sensor piece gap over entire perimeter of the
wheel.
16 CHECK TONE WHEEL RUNOUT.
Measure the tone wheel runout.
17 CHECK GROUND SHORT OF ABS WHEEL
SPEED SENSOR.
1) Turn the ignition switch to ON.
2) Measure the resistance between ABS
wheel speed 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:
18 CHECK GROUND SHORT OF HARNESS.
1) Turn the ignition switch to OFF.
2) Connect the connector to ABS wheel speed
sensor.
3) Measure the resistance between
ABSCM&H/U connector terminal 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:
19 CHECK POOR CONTACT IN CONNECTORS. Is there poor contact in con-
Check
Is the gap the following value?
Front wheel:
0.3 — 0.8 mm (0.012 — 0.031 in)
Rear wheel:
0.7 — 1.2 mm (0.028 — 0.047 in)
Is the runout less than 0.05 mm
(0.0020 in)?
Is the resistance more than 1
MΩ?
Is the resistance more than 1
MΩ?
nectors between ABSCM&H/U
and ABS wheel speed sensor?
ABS-108
Yes
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 ABS
wheel speed sen-
sor or worn tone
wheel.
Go to step 17. Replace the tone
wheel. Front: <Ref.
to ABS-21, Front
Tone Wheel.>
Rear: <Ref. to
ABS-22, Rear
Tone Wheel.>
Go to step 18. Replace the ABS
wheel speed sen-
sor and ABSCM
only.
Front: <Ref. to
ABS-15, Front
ABS Wheel Speed
Sensor.> Rear:
<Ref. to ABS-18,
Rear ABS Wheel
Speed Sensor.>
<Ref. to ABS-8,
ABSCM (ABS
CONTROL MOD-
ULE), REPLACE,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
Go to step 19. Repair the har-
ness between
ABSCM&H/U and
ABS wheel speed
sensor.
And replace the
ABSCM only.
<Ref. to ABS-8,
ABSCM (ABS
CONTROL MOD-
ULE), REPLACE,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
Repair the con- Go to step 20.
nector.
No