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?

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?

Tech A states that engine management systems were born out of a need for greater efficiency and emission control. Tech B states that the engine management system controls the operation of the engine and all of its related system. Who is correct?

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

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?

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?

Which of the following is the best tool to measure the voltage output from a throttle position sensor?

Which part of a powertrain control module retains diagnostic trouble codes (DTC's), freeze-frame data, and learned data?

Which node of the PCM translates information from, or to, the other networks so that it can be shared between networks?

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?

The data processor function of a PCM receives the data from the input signal processing section and compares it to______ memory.

The _______ is hardware related and makes up the physical portion of the PCM.

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

In many cases, the software in the PCM's memory can be updated by uploading software updates, called a

In an engine management system, work is done by the actuators, which consist of all of the following EXCEPT:

Tech A says that open loop is when the PCM pretty much ignores the oxygen sensor signals. Tech B says that closed loop is when the PCM shuts off the fuel injectors during a collision. Who is correct?

Engine performance relates to emissions efficiency

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.

Which of the following is the best actuator to use for controlling a high-current fuel pump in a PCM?