Circuit Diagram - Malaguti SPIDER MAX GT 500 Manual Diagnóstico

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B
SPIDER MAX 500
20. STEPPER MOTOR

20.1 Circuit diagram

CENTRAL UNIT
idling speed
regulator
Sch. 12
(stepper motor)
The throttle body is equipped with a secondary air circuit controlled by a piston-valve operated by a stepper-motor.
The central unit send an input to the stepper motor only when it is necessary to change the valve opening.
The engine revolutions are divided into fractions called steps: by changing the opening steps it is possible to supply the
engine in order to ease the start-up procedure and correct the air intake at cold engine.
Once the engine has reached the operating temperature, the stepper motor has partially closed back.
In order to prevent the adjustment piston excessive wear, the operating rpm is achieved by means of a minimum
opening of around 45 steps.
Every time the key switch is moved to the "OFF" position the piston travels fully home and opens for a number of pre-
defined steps (auto-reset) until it seats properly.
When it changes the stepper motor opening steps, the central unit also modifies the injection time in order to ensure a
correct carburetion.
The idling speed is stabilised around 1450÷50 RPM. After the start-up at warm engine, the first rpm increase can be
heard, followed by the consequent closing of the stepper motor aimed at stabilising the engine rpm.
In case of rpm anomalies, before performing any electrical check, make sure that the gas valve and secondary air circuit
are properly cleaned.
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