Automotive Engine Performance Post Test Review Already Passed

Magnetic pulse generators are commonly used to send data to the computer about: The speed of the monitored component. Technician A says pulse width modulation (PWM) is measured in a length of time, not a percentage of a cycle. Technician B says that the cooling fan relay is usually controlled by the PCM through PWM. Who is correct? Both A and B When the pressure in the intake manifold increases the fuel pressure regulator on a port fuel injection system: Increases fuel pressure. Technician A says a P0300 is considered a generic DTC. Technician B says a P1300 is considered a manufacturer specific DTC. Both A and B The vent valve in an evaporative emissions system may be: Opened to allow fresh air through the charcoal canister and closed with the purge valve open while the PCM monitors the fuel tank pressure sensor for vacuum.Technician A says the computer may activate a circuit by completing the path to ground. Technician B says the computer may activate a circuit by completing the path to power. Who is correct? Both A and B. Technician A states that non-contact type hall-effect sensors wear out very quickly. Technician B states that some throttle position sensors are non-contact. Technician B only. The purpose of the PCV system is to: Control emissions, relieve the engine's crankcase of pressure and vapors, and reduce the formation of oil sludge. Technician A says the crankshaft position sen