Two technicians are discussing MAP sensors. Technician A says that the MAP sensor should be replaced if anything comes out of the sensor when the vacuum hose is removed from the sensor. Technician B says that the injector pulse width should increase when vacuum to the MAP sensor is increased. Who is right?

Question

Quizplus · Accepted Answer

Technician A is correct because if anything (like liquid or debris) comes out of the MAP sensor when the vacuum hose is removed, it indicates the sensor is contaminated or damaged, and replacement is necessary. Technician B is incorrect because the injector pulse width should decrease, not increase, when vacuum to the MAP sensor is increased, as increased vacuum indicates a lower engine load, requiring less fuel.

Two Technicians Are Discussing MAP Sensors