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technician a says that speed density systems use vehicle speed and fuel density to determine injector pulse width. technician b says that mass airflow systems use a sensor to measure the mass of the air entering the engine. who is correct?
a. technician a
b. technician b
c. both technician a and technician b
d. neither technician a nor technician b
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Explanation:

Speed - density systems use manifold absolute pressure (MAP) and engine speed to determine injector pulse width, not vehicle speed and fuel density. Mass - airflow systems indeed use a sensor (mass - air - flow sensor) to measure the mass of the air entering the engine.

Answer:

B. Technician B