Question 1

In the CAN bus system:

Accepted Answer

A) CAN B is high speed and not fault tolerant. 
B) CAN C is fault tolerant. 
C) Can C is low speed and used for many body control functions. 
D) None of these choices. 
A) CAN B is high speed and not fault tolerant. 
B) CAN C is fault tolerant. 
C) Can C is low speed and used for many body control functions. 
D) None of these choices. D

Question 2

On a data bus that uses two wires, why are the wires twisted?

Accepted Answer

A) To increase the physical strength of the wires. 
B) For identification of the circuit. 
C) To reduce the effect of the high current flow through the bus wires on other circuits. 
D) To minimize the effects of an induced voltage on the data bus. 
A) To increase the physical strength of the wires. 
B) For identification of the circuit. 
C) To reduce the effect of the high current flow through the bus wires on other circuits. 
D) To minimize the effects of an induced voltage on the data bus. D

Question 3

In a J1850 VPWM bus system, how can a short to ground be isolated?

Accepted Answer

A)  Use a jumper wire to supply battery voltage to pin 2 of the DLC while observing the DMM. 
B)  Disconnect in-line connectors one at a time while observing the DMM. 
C)  Use a jumper wire to short pin 15 of the DLC to ground while observing the DMM. 
D)  All of these choices. 
A)  Use a jumper wire to supply battery voltage to pin 2 of the DLC while observing the DMM. 
B)  Disconnect in-line connectors one at a time while observing the DMM. 
C)  Use a jumper wire to short pin 15 of the DLC to ground while observing the DMM. 
D)  All of these choices. B

Question 4

Protocol is defined as:

Accepted Answer

A) A common communication method. 
B) A method of reducing EMI. 
C)  Data transmission through a single circuit. 
D) All of these choices. 
A) A common communication method. 
B) A method of reducing EMI. 
C)  Data transmission through a single circuit. 
D) All of these choices.

Question 5

If one of the CAN C bus circuits were shorted to ground, all of the following could occur EXCEPT:

Accepted Answer

A)  No-start. 
B)  No communication between scan tool and any CAN C modules. 
C)  Central Gateway Module logs a loss of communication fault code against CAN C modules. 
D)  The bus will operate in single-wire mode. 
A)  No-start. 
B)  No communication between scan tool and any CAN C modules. 
C)  Central Gateway Module logs a loss of communication fault code against CAN C modules. 
D)  The bus will operate in single-wire mode.

Question 6

In the local interconnect network (LIN) bus:

Accepted Answer

A) The master controller is connected to the CAN bus and controls the data transfer speed. 
B) The master controller translates data between the slave modules and the CAN bus. 
C) Supporting up to 15 slave modules is possible. 
D) All of these choices. 
A) The master controller is connected to the CAN bus and controls the data transfer speed. 
B) The master controller translates data between the slave modules and the CAN bus. 
C) Supporting up to 15 slave modules is possible. 
D) All of these choices.

Question 7

To isolate a class A bus circuit that is shorted to battery voltage, all of the following methods can be used EXCEPT:

Accepted Answer

A)  Use a jumper wire and connect the faulty circuit to ground. 
B) Turn the ignition switch off to see if it is switched voltage. 
C)  Pull fuses one at a time to determine the shorted circuit. 
D) Pull relays one at a time to determine shorted circuits or components. 
A)  Use a jumper wire and connect the faulty circuit to ground. 
B) Turn the ignition switch off to see if it is switched voltage. 
C)  Pull fuses one at a time to determine the shorted circuit. 
D) Pull relays one at a time to determine shorted circuits or components.

Question 8

A computer that can communicate on a data bus is known as:

Accepted Answer

A)  Node. 
B)  Byte. 
C)  Protocol. 
D)  Transceiver. 
A)  Node. 
B)  Byte. 
C)  Protocol. 
D)  Transceiver.

Question 9

A class A bus that has zero volts on both bus circuits may indicate:

Accepted Answer

A)  Both circuits are shorted to ground. 
B) The master module's power feed circuit is open. 
C) An open bus connector to the master module. 
D) All of these choices. 
A)  Both circuits are shorted to ground. 
B) The master module's power feed circuit is open. 
C) An open bus connector to the master module. 
D) All of these choices.

Question 10

In a single-wire bus network, EMI is controlled by:

Accepted Answer

A) Using a shielded wire. 
B) Slowly ramping up and down the voltage levels. 
C)  Locating the wire outside of the normal wiring harness. 
D)  None of these choices. 
A) Using a shielded wire. 
B) Slowly ramping up and down the voltage levels. 
C)  Locating the wire outside of the normal wiring harness. 
D)  None of these choices.

Question 11

The lab scope trace of an ISO-K bus system shows the voltage going to −0.5 volts. This would indicate:

Accepted Answer

A)  The scan tool bias voltage. 
B)  The module attempting to transmit data to the scan tool. 
C)  The scan tool attempting to request data from the module. 
D)  Excessive electrical noise on the circuit. 
A)  The scan tool bias voltage. 
B)  The module attempting to transmit data to the scan tool. 
C)  The scan tool attempting to request data from the module. 
D)  Excessive electrical noise on the circuit.

Question 12

All of the following can cause total bus failure of the J1850 VPWM bus system, EXCEPT:

Accepted Answer

A)  Open bus wire to the BCM. 
B)  Bus wire shorted to ground. 
C)  Bus wire shorted to battery voltage. 
D)  Internal short in a module. 
A)  Open bus wire to the BCM. 
B)  Bus wire shorted to ground. 
C)  Bus wire shorted to battery voltage. 
D)  Internal short in a module.

Question 13

On a LIN bus, zero volts are indicated on the bus circuit with the slave module disconnected. What is the LEAST likely cause?

Accepted Answer

A)  An open circuit between the master module and the slave module connector. 
B) A shorted circuit between the master module and the slave module connector. 
C)  Faulty master module. 
D) Faulty slave module. 
A)  An open circuit between the master module and the slave module connector. 
B) A shorted circuit between the master module and the slave module connector. 
C)  Faulty master module. 
D) Faulty slave module.

Question 14

All of the following statements concerning multiplexing are true EXCEPT:

Accepted Answer

A) Hard wiring and vehicle weight are reduced. 
B) A single computer controls all of the vehicle functions. 
C) Enhanced diagnostics are possible. 
D) Reduces driver requirements in the computer. 
A) Hard wiring and vehicle weight are reduced. 
B) A single computer controls all of the vehicle functions. 
C) Enhanced diagnostics are possible. 
D) Reduces driver requirements in the computer.

In the CAN bus system:

On a data bus that uses two wires, why are the wires twisted?

In a J1850 VPWM bus system, how can a short to ground be isolated?

Protocol is defined as:

If one of the CAN C bus circuits were shorted to ground, all of the following could occur EXCEPT:

In the local interconnect network (LIN) bus:

To isolate a class A bus circuit that is shorted to battery voltage, all of the following methods can be used EXCEPT:

A computer that can communicate on a data bus is known as:

A class A bus that has zero volts on both bus circuits may indicate:

In a single-wire bus network, EMI is controlled by:

The lab scope trace of an ISO-K bus system shows the voltage going to −0.5 volts. This would indicate:

All of the following can cause total bus failure of the J1850 VPWM bus system, EXCEPT:

On a LIN bus, zero volts are indicated on the bus circuit with the slave module disconnected. What is the LEAST likely cause?

All of the following statements concerning multiplexing are true EXCEPT:

Introduction to Automotive Electrical and Electronic Systems Safety

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Instrumentation and Warning Lamps and Warning Lamp System Diagnosis and Repair

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Exam 11: Vehicle Communication Networks Vehicle Multiplexing Diagnostics

In the CAN bus system:

On a data bus that uses two wires, why are the wires twisted?

In a J1850 VPWM bus system, how can a short to ground be isolated?

Protocol is defined as:

If one of the CAN C bus circuits were shorted to ground, all of the following could occur EXCEPT:

In the local interconnect network (LIN) bus:

To isolate a class A bus circuit that is shorted to battery voltage, all of the following methods can be used EXCEPT:

A computer that can communicate on a data bus is known as:

A class A bus that has zero volts on both bus circuits may indicate:

In a single-wire bus network, EMI is controlled by:

The lab scope trace of an ISO-K bus system shows the voltage going to −0.5 volts. This would indicate:

All of the following can cause total bus failure of the J1850 VPWM bus system, EXCEPT:

On a LIN bus, zero volts are indicated on the bus circuit with the slave module disconnected. What is the LEAST likely cause?

All of the following statements concerning multiplexing are true EXCEPT:

Introduction to Automotive Electrical and Electronic Systems Safety

Basic Theories Special Tools and Procedures

Electrical and Electronic Components Basic Electrical Troubleshooting and Service

Wiring and Circuit Diagrams Wiring Repair and Reading Circuit Diagrams

Automotive Batteries Battery Diagnosis and Service

Starting Systems and Motor Designs Starting System Diagnosis and Service

Charging Systems Charging System Testing and Service

Lighting Circuits Lighting Circuits Repair and Diagnosis

Introduction to the Body Computer Body Computer System Diagnosis

Computer Input Sensor Diagnostic Routines

Advanced Lighting Circuits Advanced Lighting Systems Diagnosis and Service

Instrumentation and Warning Lamps and Warning Lamp System Diagnosis and Repair

Accessories Electrical Accessories Diagnosis and Repair

Radio Frequency and Infotainment Systems Servicing Radio Frequency and Infotainment Systems

Passive Restraint Systems Servicing Passive Restraint Systems

Vehicles With Alternative Power Sources Hybrid and High-Voltage System Service

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