Question 1.Tech A says that the oxygen sensor measures the amount of oxygen entering the intake manifold. Tech B says that many oxygen sensors have a built-in heater to warm them up more quickly. Who is correct?
2.Tech A says that fuel shutoff mode is when the PCM shuts off the fuel pump when the fuel tank is overfull. Tech B says that clear flood mode is activated by holding the throttle to the floor with the key off and then cranking the engine. Who is correct?
3.Tech A says that speed density systems use vehicle speed and fuel density to determine injector pulse width. Tech B says that mass airflow systems use a sensor to measure the mass of the air entering the engine. Who is correct?
4.Which part of a powertrain control module retains diagnostic trouble codes (DTCs), freeze-frame data, and learned data?
5.Tech A says that mass airflow sensors determine mass airflow based on engine speed and manifold pressure. Tech B says that some airflow sensors use a hot wire to determine mass airflow. Who is correct?
6.Tech A says that the oxygen sensor is part of the feedback system for the engine management system. Tech B says that long-term fuel trims that are positive means that the PCM is leaning out the fuel mixture from the base pulse-width setting. Who is correct?
7.Which of the following is the best tool to measure the voltage output from a throttle position sensor?c. Scan toola. DVOMb. DMMd. Digital storage oscilloscope (DSO)
8.In a vehicle, thermistors are used in various sensors related to:
9.Which of the following modes is used by technicians to fool the engine into cranking without starting during a cranking sound diagnosis test?Fuel shutoff modeClear flood modeKey on, engine off modeStoichiometric mode10.The feedback looping system in a three-way catalytic converter serves to adjust:the air-fuel ratio.engine speed.the temperature in the passenger cabin.fuel consumption.
Question 1.Tech A says that when testing a relay winding with an ohmmeter, it should show the winding is open. Tech B says that the solenoid closes a set of heavy contacts that send current flow to the starter motor. Who is correct?
2.Tech A says that some alternator pulleys are designed to freewheel in one direction. Tech B says that the alternator output terminal is connected to one of the slip rings on the rotor. Who is correct?
3.Tech A says that the pull-in winding is short-circuited when the solenoid is fully engaged. Tech B says that the starter drive has a built-in one-way clutch. Who is correct?
4.Tech A says that the stator rotates inside a magnetic field. Tech B says that the rotor is bolted between the two end housings. Who is correct?
5.Alternators have all of the following characteristics except:
6.Tech A says that a voltage drop of 0.8 volt on the starter ground circuit is within specifications. Tech B says that high starter draw current could be caused by a spun main bearing in the engine. Who is correct?
7.All of the following statements with respect to the operational function of a starter solenoid are true except:
8.What is the main purpose of the fork in starter motor engagement?
9.Which component slows down the armature when the starter motor is disengaged?
10.Tech A says that overcharging can lead to short life of bulbs and other electrical devices. Tech B says that the charging system regulated voltage is checked with maximum load on the battery. Who is correct?
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