Automotive Engine Performance Post Test Review Already Passed

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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 sensor can be a Hall-effect switch. Technician B says the crankshaft position sensor can be a magnetic pulse generator. Who is correct? ✔✔Both A and B. Technician A says both the fuel injector and spark plug are turned off when a cylinder is deactivated on a variable displacement engine. Technician B says the spark plug may foul if is allowed to become too cool during cylinder deactivation. Who is correct? ✔✔Technician B. Technician A says that ion-sensing ignition systems are based on the coil on plug system. Technician B say that the ion-sensing ignition system uses the spark plug itself as a sensor. Who is correct? ✔✔Both A and B. The acceptable amount of ethanol mixed with conventional gasoline is: ✔✔Up to 10%. True or False: Long term fuel trim will change in an attempt to keep short term fuel trim near 0. ✔✔True Short-term fuel trim (STFT) adds or subtracts f [Show More]

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