B
ELECTRONIC SPEED CONTROL
Read all of SAFETY and this section before attempting any procedure. Pay particular attention to Notices, Cautions, Warnings and Dangers.
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Repair and Service Manual
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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 electri-
cal signals which the controller uses to determine the
motor speed.
Fig. 2 Speed Sensor
Controller
The controller is a solid state unit that activates a sole-
noid and controls the function of the vehicle by respond-
ing to inputs from the ITS and motor speed sensor. The
controller and solenoid are located under the front facing
rear seat on the rear-driver side of the under seat com-
partment.
The pedal box and the speed sensor are connected to
the controller through a 35-pin connector on the control-
ler.
The controller is wired to the batteries and develops a
regulated power supply for the ITS. The plunger position
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 pro-
cedures are designed to test the basic functionality
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 compo-
nents (controller or ITS) must be replaced.
GENERAL FAULT TESTING
Testing
A maintenance feature of the controller is the ability to
diagnose electrical faults preventing the vehicle to oper-
ate at its fullest potential. A light on the controller face
will blink a code informing the technician to the likely
cause of the vehicle malfunction.
A series of blinks will indicate the fault code (one, two,
three, four or five followed by a pause and one, two,
three, four or five more blinks). By reading the decal
attached near the controller, or by reading the Diagnos-
tic Mode Fault Code chart, the likely fault, symptom(s),
and corrective action to be taken can be found (See LED
Fault Code Chart on page 133).
It is unlikely that the mechanical adjustment of the pedal
box has changed. The initial tests should be conducted
with a digital volt ohm meter (DVOM) to identify the
failed component.
A recommended DVOM is available through the Service
Parts Department as P/N 27481-G01. Any DVOM may
be used. The accuracy, controls, displays and features
may vary depending on the make and model. Always
follow the meter manufacturer’s recommendations and
instructions for the use and care of the meter.
To assure accurate readings, be sure to set the meter to
the closest voltage reading above the expected voltage.
To prevent an injury resulting from
the unexpected movement of the
vehicle, always raise the rear wheels
before conducting any tests.
To prevent possible motor damage, never operate the
vehicle at full throttle for more than 4-5 seconds
while the vehicle is in a “no-load” condition.
For static tests, raise the rear wheels of the vehicle and
support the vehicle on jack stands. Test the vehicle sta-
bility before proceeding (See LIFTING THE VEHICLE
on page 9).
Place the keyswitch in the F position. Press the acceler-
ator pedal until the micro switch in the pedal box acti-
vates causing the solenoid mounted to the controller to
make an audible click. If the solenoid does not click, test
the batteries (See Testing Battery Voltage on page 83).
Speed Sensor
PRELIMINARY
