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

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An oscilloscope is connected to a fuel injector ground control circuit. While monitoring the waveform, the technician observes that the injector pulse width is 1.8 milliseconds (ms) at normal idle, but increases to 12 ms when the throttle is snapped wide open. What does this change indicate?

A faulty PCM injector driver circuit that is failing to control current Normal PCM operation providing enrichment during rapid acceleration A short-circuit to ground in the injector wire harness A high-resistance fault in the injector solenoid coil winding

Correct Answer:

Normal PCM operation providing enrichment during rapid acceleration

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