Automotive Servicing NC III Practice Questions - TESDA Automotive Servicing NC III Competency Assessment Exam

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While diagnosing a rough idle on a vehicle equipped with an Electronic Fuel Injection (EFI) system, a technician connects an oscilloscope to a magnetic inductive crankshaft position (CKP) sensor. What waveform pattern should be observed on the screen as the engine runs?

A continuous digital square wave switching between 0V and 5V An analog sine wave with amplitude and frequency that increase as engine speed increases A constant DC voltage that drops steadily as engine speed increases A pulse-width modulated (PWM) duty-cycle signal that varies between 0V and 12V

Correct Answer:

An analog sine wave with amplitude and frequency that increase as engine speed increases

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