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Check that the ABS warning lamp
illuminates in the following way.
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Even if the pressure inside the
accumulator of the hydraulic brake booster (HBB) is below
the specified value, the ABS warning lamp will illuminate
because ABS operation has been stopped. In such case, if the
HBB pump is driven by the accumulated pressure inside the
accumulator and causes the ABS warning lamp to switch off,
it does not indicate a system malfunction.
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1.When the ignition switch
is turned to the "ON" position, the ABS warning lamp
illuminate for approximately 3 seconds* and
then switches off.
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*: ABS
warning lamp may stay ON until the vehicle speed
reaches a few km/h. As far as the ABS-ECU
stores any diagnosis code related to the wheel
speed sensor malfunction or the motor
malfunction as past trouble, the ABS-ECU
continues illuminating ABS warning lamp until it
verifies that the malfunction for that code is
resolved (Startup check).
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2.When the ignition switch is turned to the
START position, the ABS warning lamp remains
illuminated.
3.When the ignition switch returns
from the START to the ON position, the ABS warning lamp
illuminates* for approximately 3 seconds,
and then remains switched off.
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*:The ABS
warning lamp may remain illuminated after the
ignition switch is turned to the ON position and
the vehicle starts moving until the vehicle
speed reaches a speed of several km/h. This only
occurs if a diagnosis code from No.21 to No.24
relating to a wheel speed sensor malfunction and
No.25 defective tyre with different diameter was
generate when the ignition switch was last
turned to the ON position and is still stored in
the ABS-ECU. The ABS-ECU will cause the ABS
warning lamp to illuminate until the point where
it can ascertain (during the starting-off check)
that the problem associated with this diagnosis
code has returned to normal.
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4.If the illumination is other than the
above, check the diagnosis codes.
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