Workbook, Heavy Duty Truck Systems, 6E
Chapter Twelve – Answer Key
1. When two or more truck computerized systems such as the engine and transmission
electronics are capable of sharing data at high speeds on a communications bus, this is
usually known as:
2. How many bits are there in a byte?
3. Which of the following is true of a green J1939 chassis data bus connector?
4. Which of the following would be typical “wake–up” source(s) for a typical truck
multiplexed data bus?
5. Which of the following would be most likely to occur if you were to physically
disconnect a “smart” switch on a truck dash?
6. When examining how a FET functions, which of the following best describes the role of
the gate?
7. What is another way of saying algorithm?
8. What is the term used to describe a communication signal that is converted to a radio
frequency signal and then superimposed over a trailer cord, 12-volt auxiliary power wire?
9. When the resistance status on a multiplex smart switch is altered, what happens
immediately after?
10. When repairing a low bus twisted wire pair, which of the following steps must be
observed?