Tech A says that analog signals are continuously variable signals. Tech B says that digital signals are direct on/off signals with no in-between transition. Who is correct?

Select one:

About how much signal voltage is generated by a throttle position sensor at closed throttle?

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The rate at which these sound waves reach our ears is called ________.

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Tech A says that potentiometer type sensors use a variable resistance to create a variable voltage signal that corresponds to a specific condition. Tech B says that oxygen sensors are the potentiometer type. Who is correct?

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In a vehicle, thermistors are used in various sensors related to:

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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?

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Tech A says that in modern vehicles, an oxygen sensor is only positioned in the exhaust pipe after the catalytic converter. Tech B says that the oxygen sensor provides the electronic body control module (EBCM) with an electrical signal that relates to the amount of oxygen in the exhaust gas. Who is correct?

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Tech A states that the PCM also communicates with other electronic control modules on the vehicle. Tech B states that the PCM is a gateway node that is connected to each of the other networks. Who is correct?

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Which of the following is often used to control other actuators when the computer needs to control a high-current load?

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In an engine management system, _______ monitor various operating conditions.

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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?

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The feedback looping system in a three-way catalytic converter serves to adjust:

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When the oxygen sensor reaches its operating temperature, around ______, it sends an output voltage to the control unit to signal whether the mixture is richer or leaner than a lambda value of 1.

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Which of the following modes is used by technicians to fool the engine into cranking without starting during a cranking sound diagnosis test?

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Tech A says that the output drivers in the PCM typically send either simple on/off signals, or pulse-width-modulated signals to the actuators, depending on the actuator being controlled. Tech B says that in many cases, the software in the PCM's memory can be updated by uploading software updates, called a reflash process. Who is correct?

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Tech A says that any vehicle made after 1976 will use two oxygen sensors. Tech B says that oxygen sensors are located in the intake manifold. Who is correct?

Select one:

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?

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The purpose of the vehicle speed sensor (VSS) is to measure the:

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Tech A states that the PCM has the ability to learn from its actions and to use that information to make better decisions in the future. Tech B states that it can also perform basic self-diagnostics on virtually all of the components in the system. Who is correct?

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The power train control module (PCM) must control a high-current fuel pump. The best actuator to use would be a:

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In an engine management system, _______ monitor various operating conditions.

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Tech A states that a relay is a controlled device that receives signals from the PCM. Tech B states that a solenoid is a controlled device that receives signals from the PCM. Who is correct?

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Tech A says that the difference between the stored pulse width and the actual pulse width required to keep the mixture at the correct ratio is called fuel trim. Tech B says that long-term fuel trim values can be positive or negative. Who is correct?

Select one:

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