Power Unit; Anti-Lock Brake System (Abs) Indicator Light - Honda Prelude 1993 Service Manual

Anti-lock Brake System (ABS)
Features/Construction/Operation (cont'd)
Power Unit
The power unit consists of a motor, filter, guide, piston rod and cylinder body. Since a guide is positioned oftset to the
center of the motor shalt, the rotation of the motor and cylinder body provides the reciprocating motion to the piston ,od,
The brake fluid is thus pressurized and fed to the relief valve. accumulator and modulator,
As the pressure in the accumulator exceeds the prescribed level, the pressure switch is turned on. Approx. O.5 s€conds
after receiving the ON-signal. the ABS control unit stops the motor relay operation. In this state, the pressure in the ac-
cumulator reaches 23000 kPa (23O kg/cm' , 327O psi).
lf the pressure doesn't reach the prescribed value after the motor has operated continuously tor a specitied period, the
ABS control unit stoDs the motor and activates the ABS indicator liqht.
ACCUMULATOR
PRESSUBE
swlTcH
To Modulator
Roliot V.lvo
valv6 Rod
cylindor Eody
Pisron Rod
lRotationl
(Reciptocaring Motionl
Anti-lock Brake System (ABSI Indicator Light
This warning system turns on the ABS indicator light when one or more of the below described abnormalities is detected.
This is onlv a oartial list.
a When the operating time of the motor in the power unil exceeds the specitied period.
a When vehicle running time exceeds 30 seconds without releasing the parking brake lever.
a When one of the rear wheels is locked during running,
a When absence ot speed signals from any of the tour wheel sensors is detected.
a When the activation time of all solenoids exceeds a given time or an open or short circuit is detected in the
solenoid system.
a When solenoid output is not detected in the simulated anti-lock brake system operation carried out during running
at speeds of 6 mph (1O km/h) or more.
To check the ABS indicator light bulb. the light is activated when the ignition switch is turned on. lt is turned off after the
engrne is started if there is no abnormality in the system,
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