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The main component parts of this ABS include the following parts in addition to those of the conventional brake
system.
• Wheel speed sensor which senses revolution speed of each wheel and outputs its signal.
• ABS warning lamp which lights to inform abnormality when system fails to operate properly.
• ABS hydraulic unit/control module assembly is incorporated ABS control module, ABS hydraulic unit (actua-
tor assembly), fail-safe relay and pump motor relay.
– ABS control module which sends operation signal to ABS hydraulic unit to control fluid pressure applied to
each wheel cylinder based on signal from each wheel speed sensor so as to prevent wheel from locking.
– ABS hydraulic unit which operates according to signal from ABS control module to control fluid pressure
applied to wheel cylinder of each 4 wheels.
– Fail-safe relay (solenoid valve) relay which supplies power to solenoid valve in ABS hydraulic unit and
pump motor relay.
– Pump motor relay which supplies power to pump motor in ABS hydraulic unit.
• G sensor which detects body deceleration speed. (For 4WD model only)]
This ABS is equipped with Electronic Brake force Distribution (EBD) system that controls a fluid pressure of rear
wheels to best condition, which is the same function as that of proportioning valve, by the signal from wheel sen-
sor independently of change of load due to load capacity and so on. And if the EBD system fails to operate prop-
erly, the brake warning lamp lights to inform abnormality.
[A]
[A] : RH steering vehicle shown
1. ABS hydraulic unit/control module assembly
2. G sensor (For 4WD vehicle only)
3. Wheel speed sensors
NOTE:
As for the difference of RH steering vehicle and LH steering vehicle, the location of the combination
meter and the brake master cylinder assembly only changes.
6
5
1
4. Stop lamp switch
5. ABS warning lamp
6. EBD warning lamp (Brake warning lamp)
ANTILOCK BRAKE SYSTEM (ABS) 5E-3
4
2
3
3
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