What does an above-normal increase in the duty cycle of the PWM signal applied to the HEUI ICPR indicate?
A)Worn-out HEUI injector nozzles.
B)Soot-thickened engine oil.
C)A worn-out high-pressure oil pump.
D)A broken amplifier piston return spring.

Question

Quizplus · Accepted Answer

An above-normal increase in the duty cycle of the PWM signal applied to the HEUI ICPR typically indicates a worn-out high-pressure oil pump, as the system compensates for the lack of pressure by increasing the duty cycle.

What Does an Above-Normal Increase in the Duty Cycle of the PWM