ABS-56
ABS (DIAGNOSTICS)
DIAGNOSTICS CHART WITH DIAGNOSIS CONNECTOR
Step Check Yes No
1 CHECK IF THE WHEELS HAVE TURNED
FREELY FOR A LONG TIME.
Check if the wheels have been
turned freely for more than one
minute, such as when the vehi-
cle is jacked-up, under full-lock
cornering or when tire is not in
contact with road surface.
The ABS is nor-
mal. Erase the
trouble code.
NOTE:
When the wheels
turn freely for a
long time, such as
when the vehicle is
towed or jacked-
up, or when steer-
ing wheel is contin-
uously turned all
the way, this trou-
ble code may
sometimes occur.
Go to step
2.
2 CHECK TIRE SPECIFICATIONS.
Turn ignition switch to OFF.
Are the tire specifications cor-
rect?
Go to step
3.
Replace tire.
3 CHECK WEAR OF TIRE.
Is the tire worn excessively? Replace tire. Go to step
4.
4 CHECK TIRE PRESSURE.
Is the tire pressure correct? Go to step
5.
Adjust tire pres-
sure.
5 CHECK INSTALLATION OF ABS SENSOR.
Tightening torque:
32
±
±±
±
10 N·m (3.3
±
±±
±
1.0 kgf-m, 24
±
±±
±
7 ft-lb)
Are the ABS sensor installation
bolts tightened securely?
Go to step
6.
Tighten ABS sen-
sor installation
bolts securely.
6 CHECK ABS SENSOR GAP.
Measure tone wheel to ABS sensor piece gap
over entire perimeter of the wheel.
Specifications
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 gap within the specifica-
tions?
Go to step
7.
Adjust the gap.
NOTE:
Adjust the gap us-
ing spacer (Part
No. 26755AA000).
If spacers cannot
correct the gap, re-
place worn sensor
or worn tone
wheel.
7 PREPARE OSCILLOSCOPE.
Is an oscilloscope available? Go to step
8.
Go to step
9.
8 CHECK ABS SENSOR SIGNAL.
1)Raise all four wheels of ground.
2)Turn ignition switch OFF.
3)Connect the oscilloscope to the connector.
4)Turn ignition switch ON.
5)Rotate wheels and measure voltage at spec-
ified frequency. <Ref. to ABS-17, WAVE-
FORM, Control Module I/O Signal.>
NOTE:
When this inspection is completed, the AB-
SCM&H/U sometimes stores the trouble code
29.
Connector & terminal
Front RH
(F95) No. 1 (+) — No. 2 (
−
−−
−
):
Front LH
(F94) No. 1 (+) — No. 2 (
−
−−
−
):
Rear RH
LHD: (B99) No. 9 (+) — No. 10 (
−
−−
−
):
RHD: (B99) No. 20 (+) — No. 21 (
−
−−
−
):
Rear LH
LHD: (B99) No. 4 (+) — No. 5 (
−
−−
−
):
RHD: (B99) No. 8 (+) — No. 9 (
−
−−
−
):
Is oscilloscope pattern smooth,
as shown in figure?
Go to step
12.
Go to step
9.
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