Speed Sensor - Cushman 632904 Service Manual

Read all of Section B and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
If the operator attempts to override the electronic brak-
ing feature by moving the direction selector or key
switch to another position, the warning beeper will
sound and the vehicle will brake rapidly until it reaches
the speed of approximately 2 mph (3 kph).
The system is a low power consumption unit but it will
drain the vehicle batteries over a period of time. If the
vehicle is to be stored for a prolonged period of time,
the controller should be disconnected from the batteries
by selecting the 'TOW/MAINTENANCE' position on the
Run-Tow/Maintenance switch located under the pas-
senger seat.
The Electronic Speed Control system consists of three
separate units, a pedal box, speed sensor and control-
ler.
Pedal Box
The pedal box assembly is a modularized unit that con-
tains the accelerator pedal, return spring and an
enclosed box that contains the pedal position micro
switch and a solid state Inductive Throttle Sensor (ITS)
that is activated by a moving plunger attached to the
accelerator pedal. To access the pedal box, remove the
rocker panel, lift the floor mat, and remove the access
cover from the floor (Ref Fig. 3). The ITS and plunger
are accessed by removing the four screws and top
cover from the enclosed pedal box.
Fig. 2 Access to Pedal Box

Speed Sensor

The speed sensor uses a sealed sensor to read the
impulses of a ring magnet attached to the armature
shaft of the motor. Magnetic pulses are converted into
electrical signals which the controller uses to determine
the motor speed.
Rocker Panel
Access Cover
Floor Mat
Pedal Box
Repair and Service Manual
ELECTRONIC SPEED CONTROL
Controller
The controller is a solid state unit that activates a sole-
noid and controls the function of the vehicle by
responding to inputs from the ITS and motor speed
sensor. The controller and solenoid are located under
the front seat on the passenger side of the vehicle (Ref
Fig. 4).
Fig. 3 Controller and Solenoid
The pedal box is connected to the controller through a
24-pin plug at J1 on the controller. The speed sensor is
connected to the controller through a three-pin plug at
J2 (Ref Fig. 9).
The controller is wired to the batteries and develops a
regulated power supply for the ITS. The plunger posi-
tion relative to the ITS varies the voltage which is fed
back to the controller which interprets the change in
voltage and supplies the appropriate power to the
motor.
The ITS unit and the controller are both solid state units
that contain no user serviceable parts. The testing
procedures are designed to test the basic function-
ality of the power and control wiring systems. Once
the functionality of the wiring has been confirmed, the
remaining tests are used to identify which of the com-
ponents (controller or ITS) must be replaced.
F2
B+
J3
J2
M-
J1
B-
F1
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