Quiz 3 Ch 13 and 14

Which terminal of the OBD-II data link connector is the signal ground for all vehicles?

5

Technician A says a CANDi module will flash the RED LED rapidly if communication is detected. Technician B says A twisted pair is where two wires are twisted to prevent electromagnetic radiation from affecting the signals passing through the wires. Who is right?

B only

The UART data BUS operates at a baud rate of ________ bps.

8192

A DMM set to read DC volts is connected across terminals 6 and 14 of the DLC. The meter reads zero volts at all times, key on or key off. This indicates ________.

A CAN BUS shorted to ground

Analog signals from sensors are changed to digital signals for processing by the computer through which type of circuit?

Analog-to-digital converter

Computer speed is measured in ________.

Clock speed (Hz)

Which of these is a version of Byteflight and is a high-speed serial communication system for in-vehicle networks?

Flexray BUS

Which of these is a computer output?

Fuel injector, Trans shift soleniod, evap emmission control solenoid

GMLAN is the General Motors term for which type of module communication?

High-speed CAN

Which computer function is defined as a voltage signal from a sensor or switch?

Input

The four basic computer functions include ________.

Input, processing, storage, and output

Refer to this diagram of a fuel pump control circuit. What type of a driver circuit is used in this circuit?

Low-side driver circuit

The process of sending multiple signals of information at the same time over a signal wire and then separating the signals at the receiving end is which of these?

Multiplexing

Which computer function is defined as a voltage signal from a sensor or switch?

input

Which sensor is used to determine engine load?

MAP

GM Class 2 communication toggles between ________.

0 and 7 volts

An OBD-I Ford is able to provide engine serial data if there are terminals in which cavities of the DLC?

1 and 3

Terminal 16 of the OBD-II data link connector is used for what?

12 volt

A high-speed CAN BUS communicates with a scan tool through which terminal (s)?

2 and 5

Which terminal of the OBD-II data link connector is the chassis ground for all vehicles?

4

Terminal 16 of the OBD-II data link connector is used for what?

Bat 12V+

Which term describes the speed of data transmission?

Baud rate

Technician A says that a break-out box (BOB) used to access the BUS terminals while using a scan tool to activate the modules Technician B says that a typical 38-cavity diagnostic connector as found on many BMW and Mercedes vehicles under the hood. Who is right?

Both

Technician A says that module communications networks are used to reduce the number of wires in a vehicle. Technician B says that a communications network is used to share data from sensors, which can be used by many different modules. Who is right?

Both

CAN H and CAN L operate how?

CAN H goes to 3.5 volts when transmitting to CAN H is at 2.5 volts when not transmitting CAN L goes to 1.5 volts when transmitting to CAN L is at 2.5 volts when not transmitting

Which of these, commonly designated D2B, is an optical BUS system connecting audio, video, computer and telephone components in a single-ring structure with a speed of up to 5,600,000 bps?

Domestic Digital BUS

All OBDII vehicles use what type of read-only memory?

EEPROM

Which term describes the process of adjusting variables such as speed, load, and spark timing to determine the optimum output settings for the computer?

Engine mapping

A module is also known as a ________.

Node

Technician A says Chrysler OBD-I (1981-1995) vehicles were equipped with a BUS system called Serial Communications Interface (SCI). Technician B says The Chrysler Programmable Controller Interface (PCI) is a three-wire communication protocol that connects at the OBD-II DLC at terminal 2. Who is right?

Not both

The SAE term for the vehicle computer is ________.

PCM

The "brain" of the computer is the ________.

PCU

Which component contains the information in the computer that is specific to the particular model vehicle?

PROM, EPROM, or EEPROM

Which computer function describes how the computer handles inputs?

Process

Which item is a computer input sensor?

RPM, TPS, Engine coolant temperature

What two things can a vehicle computer actually perform (output)?

Turn something on or turn something off

What unit of electricity is used as a signal for a computer?

Volt