Cartwaveforms > actuators > stepper motor > Stepper Motor (4 Wire)
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Stepper Motor (4 Wire) Waveform Notes
The stepper or stepper motor is a small electromechanical device that allows either an air by-pass circuit or a throttle opening to alter in position depending on the amounts that the stepper is indexed.
Invariably it will be used to control the idle speed when an idle speed control valve is not employed. The stepper may control an ‘air bypass’ circuit by having 4 or 5 connections back to the Electronic Control Module (ECM). The earth’s enable the control unit to move the motor in a series of ‘steps’ and the contacts are earthed to ground via the ECM. The stepper motor may also be attached to the throttle housing, a small control rod will move onto the throttle lever and adjust the butterfly opening in very precise increments.
The individual earth paths can be checked using the oscilloscope, the waveforms should be similar on each path. Variations may be seen between different systems.
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