Subaru IMPREZA GD 2007 Series Manual page 3167

asieps_tobira_IM_US.book 38 ページ ２０１２年１月１７日 火曜日 午後３時４８分
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
ABS (DIAGNOSTICS)
Step
1 CHECK OUTPUT OF ABS WHEEL SPEED
SENSOR USING SUBARU SELECT MONI-
TOR.
1) Select {Current Data Display & Save} in the
Subaru Select Monitor.
2) Read the ABS wheel speed sensor output
corresponding to the faulty system in Subaru
Select Monitor display mode.
2 CHECK INSTALLATION OF ABS WHEEL
SPEED SENSOR.
3 CHECK ABS WHEEL SPEED SENSOR GAP.
Measure the gap between the ABS wheel
speed sensor protrusion and tone wheel.
4 CHECK TONE WHEEL RUNOUT.
Measure the tone wheel runout.
5 CHECK POOR CONTACT OF CONNECTOR.
Turn the ignition switch to OFF.
6 CHECK ABSCM&H/U.
1) Connect all connectors.
2) Erase the memory.
3) Perform the Inspection Mode.
4) Read the DTC.
7 CHECK OTHER DTC DETECTION.
8 CHECK ABS WHEEL SPEED SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from the ABS
wheel speed sensor.
3) Measure the resistance of ABS wheel
speed sensor terminals while shaking the har-
ness 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:
Check
Does the speed indicated on
the display change in response
to the speedometer reading
during acceleration or deceler-
ation when the steering wheel
is in the straight-ahead posi-
tion?
Is the ABS wheel speed sensor
installation bolt tightened 33
N·m (3.3 kgf-m, 24 ft-lb)?
Is the gap within the following?
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 there poor contact in connec-
tors between ABSCM&H/U and
ABS wheel speed sensor?
Is the same DTC still output?
Is there any other DTC
detected?
Is the resistance within the fol-
lowing? Front: 1 — 1.5 kΩ,
Rear: 1.025 — 1.265 kΩ
ABS(diag)-38
Yes No
Go to step 2. Go to step 8.
Go to step 3.
Tighten the ABS
wheel speed sen-
sor installation
bolts.
Go to step 4.
Adjust the gap.
NOTE:
Adjust the gap us-
ing spacers (Part
No. 26755AA000).
If spacers cannot
correct the gap, re-
place the worn
sensor or worn
tone wheel.
Go to step 5. Replace the tone
wheel. Front: <Ref.
to ABS-18, Front
Tone Wheel.>
Rear: <Ref. to
ABS-19, Rear
Tone Wheel.>
Repair the connec- Go to step 6.
tor.
Go to step 7.
Replace the
ABSCM&H/U.
<Ref. to ABS-6,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
Perform the diag- Temporary poor
nosis according to contact occurs.
DTC.
NOTE:
Check the harness
and connector be-
tween ABSCM&H/
U and ABS wheel
speed sensor.
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.>