Subaru IMPREZA GD 2007 Series Manual page 3172

asieps_tobira_IM_US.book 43 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)
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 POOR CONTACT OF CONNECTOR.
Turn the ignition switch to OFF.
3 CHECK CAUSE OF SIGNAL NOISE.
4 CHECK CAUSE OF SIGNAL NOISE.
5 CHECK ABSCM&H/U.
1) Connect all connectors.
2) Erase the memory.
3) Perform the Inspection Mode.
4) Read the DTC.
6 CHECK OTHER DTC DETECTION.
7 CHECK INSTALLATION OF ABS WHEEL
SPEED SENSOR.
8 CHECK ABS WHEEL SPEED SENSOR GAP.
Measure the gap between the ABS wheel
speed sensor protrusion and tone wheel.
9 PREPARE OSCILLOSCOPE.
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 there poor contact in connec-
tors between ABSCM&H/U and
ABS wheel speed sensor?
Is the car telephone or the radio
properly installed?
Is there a noise source (such as
an antenna) installed near the
sensor harness?
Is the same DTC still output?
Is there any other DTC
detected?
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 an oscilloscope available?
ABS(diag)-43
ABS (DIAGNOSTICS)
Yes No
Go to step 2. Go to step 7.
Go to step 3.
Repair the connec-
tor.
Go to step 4. Install the car tele-
phone or radio
properly.
Go to step 5.
Install the noise
source apart from
the sensor har-
ness.
Replace the Go to step 6.
ABSCM&H/U.
<Ref. to ABS-6,
ABS Control Mod-
ule and Hydraulic
Control Unit
(ABSCM&H/U).>
Perform the diag- It results from a
nosis according to temporary noise
DTC. interference.
Go to step 8. Tighten the ABS
wheel speed sen-
sor installation
bolts.
Go to step 9.
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 10. Go to step 11.