Wheel Sensor; Abs Control Unit - Honda Prelude 1993 Service Manual

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Wheel Sensor

The wheel sensor is a contactless type that detects the rotating speed of a wheel. lt is comprised of a permanent magnet

and coil. When the gear pulsers attached to the rotating parts of each wheel (front wheel: outboard toint of the

driveshaft, rear: hub bearing unit) turn, the magnetic llux around the coil in the wheel sensor alternates. generaling

voltages with frequency in proportion to wheel rotating speed. These pulses are sent to the ABS control unit and the ABS

control unit identifies the wheel speeds.

/ JJ"-'-c-- ou*ur

at HIGH SPEED

at LOW SPEED

ABS Control Unit

The ABS control unit consists of a main function section, which controls the operation of the anti-lock brake system, and

subfunction, which controls the pump motor and

"self-diagnosis"

'1 . Main Function

The main lunction section of the ABS control unit performs calculations on the basis of the signals lrom each wheel

sensor and controls the operation of the anti-lock brake system by putting into action the solenoid valves in the

modulator unit for each front brake and lor the two rear brakes.

2. Sub-tunction

The sub-function section gives driving signals to the pump motor and also gives

"selt-diagnosis" signals, necessary

for backing up the anti-lock brake system.

ABS CONTROL UNIT

PARKING BRAKE

PRESSURE SWITCH

MAIN FUNCTION

SUB-FUNCTION

. PUMP MOTOR CONTROL

. SELF-DIAGNOSIS

MAIN FUNCTION

SUB.FUNCTION

. PUMP MOTOR CONTROL

. SELF.DIAGNOSIS

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