chapter 49

GM Class 2 communication toggles between ________ and ________ volts.

0; 7

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

1 and 3

Low-speed networks operate at less than ________ bits per second.

10,000

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

12 Volts positive

Which terminal of the data link connector does General Motors use for Class 2 communication?

2

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

4

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

5

UART uses a ________ signal that toggles OV.

5 volts

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

6 and 14

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

8192

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

Both A and B

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

Both A and B

what are U codes

U codes were at first undefined, but are now used to represent network communication related diagnostic trouble codes (DTCs). it is mainly used in network code to identify the module or circuit which is not operating properly

why is a gateway module used?

for a scan tool data, a gateway module acts as the main communication module and it is responsible for communicating with other module. in motor vehicles, the instrument panel control (IPC) module or body control module used as a gateway module.

Which of these is a single-wire serial communications protocol, using one master control module and many slave modules?

Motorola Interconnect (MI)

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

Multiplexing

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. Which technician is correct?

A only

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. Which technician is correct?

B only

Which of these is 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

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

Flexray BUS

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

High-speed CAN

A module is also known as a ________.

Node

CAN H and CAN L operate how?

all of above (CAN H is at 2.5 volts when not transmitting, CAN L is at 2.5 volts when not transmitting, CAN H goes to 3.5 colts when transmitting)