DRIVE-CONTROL COMPONENTS
-
ABS
<AWD>
3-51
ELECTRONIC CONTROL UNIT (ECU)
N73ZNO3AA
L
l The ABS-ECU detects the vehicle speed in
l
The ABS-ECU has diagnostic and memory
func-
terms of a signal from the wheel speed sensor
tions.
to determine the rotating condition of the wheel,
If any failure is found, the fail-safe function is
estimates the skidding condition of the wheel
activated and the ABS warning light will
illumi-
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--
r-l
Wheel speed
1
sensors
-
-
Sensor
interface
circuit
r
I
1
I
i
J
-j-YE%q~
0 CPU monitor circuit
-+
0 Motor, solenoid control,
-
monitor circuit
Valve 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.)
d-5
Motor-relay
4
Valve relay
/
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