EVAP systems are being discussed. Technician A says nearly all engines use a pulse-width-modulated purge solenoid valve. Technician B says the purge solenoid valve is controlled by the Evaporative Emissions Module. Who is correct?
A) Technician A only
B) Technician B only
C) Both A and B
D) Neither A nor B

Question

Quizplus · Accepted Answer

Technician A is correct because nearly all modern engines use a pulse-width-modulated purge solenoid valve to control the flow of vapors from the EVAP system to the intake manifold. Technician B is incorrect because the purge solenoid valve is typically controlled by the engine control module (ECM), not a separate Evaporative Emissions Module.

EVAP Systems Are Being Discussed