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
