DRIVE-CONTROL COMPONENTS- ABS
3-51
ELECTRONIC CONTROL UNIT (ECU) N73ZNO3AA
l The ABS-ECU has diagnostic and memoryfunc-
l The ABS-ECU detects the vehicle speed in
L tions.
terms of a signal from the wheel speed sensor
to determine the rotating condition of the wheel, If any failure is found, the fail-safe function is
activated and the ABS warning light will illumi-
estimates the skidding condition of the wheel
on the basis of the predetermined theory, and nate.
outputs a signal to move the solenoid valve
in the HU in such a way as to prevent locking
the wheel.
BLOCK DIAGRAM
ABS-ECU
1 Battery I--
Wheel speed1
sensors -
-
r-l
r I 1 I
Sensor i J -j-YE%q~ Motor-relay
interface 0 CPU monitor circuit d-5
circuit -+ 0 Motor, solenoid control,-
monitor circuit Valve relay 4Valve relay/
--) drive circuit
f I
~f~iZcuit[
~~~
interface circuit
FUNCTION OF INDIVIDUAL CIRCUITS
The function of each circuit is the same as in the
FWD vehicle. (Refer to P. 3-35.)