Automotive Technology
7th Edition
ISBN: 9781337794213
Author: ERJAVEC, Jack.
Publisher: Cengage,
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Textbook Question
Chapter 25, Problem 1SA
OBD II systems use several modes of operation. List three of them.
Expert Solution & Answer
To determine
OBD 2 system and modes of operation.
Explanation of Solution
The OBD system is an On-Board Diagnosis system. It can be installed in all cars and some light duty trucks. It helps in controlling the engine parts and it has proved its importance by keeping an eye on the other parts of a vehicle also. For example, chassis, accessories and other components of cars.
It helps in a vehicle’s maintenance and diagnoses the parts of a vehicle. It helps in producing less emission thus protecting the environment from harmful emission caused by a vehicle’s emission. The diagnosis or maintenance engine light is present at the dashboard. With these light signals, we can check the service needed and the problems caused to a vehicle. It is used for an overall scanning of the vehicle. If there is any problem in the vehicle, the light indicator will indicate so. It provides a list of codes which helps in running on-board diagnosis.
These diagnoses are carried out by collecting the information from the vehicle. This information is analyzed to come up with a suitable solution.
Modes of operation of this system are listed below:
- Live date track
- Freeze frames
- Diagnosis trouble codes.
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College of Engineering\Al-Musayab
Automobile Engineering Department
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Maximum Time: 3 Hours
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a) variation of kinetic heat in the cylinder. b) variation of pressure head in the cylinder
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2- A carburetor is used to supply
(a) petrol, air and lubricating oil (b) air and diesel (e) petrol and lubricating oil (d) petrol and air.
3- In a four stroke cycle petrol engine, the charge is compressed when
a) inlet valve is closed. b) exit valve is closed.
c) both inlet and exit valves are closed. d) both inlet and exit valves are open.
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Chapter 25 Solutions
Automotive Technology
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Ch. 25 - A defective LAT sensor or circuit may cause the...Ch. 25 - Which of the following is the least likely cause...Ch. 25 - Technician A says that an oxygen sensor can be a...Ch. 25 - Prob. 2ASRQCh. 25 - While discussing ECT sensor diagnosis: Technician...Ch. 25 - While discussing Hall-effect vehicle speed sensor...Ch. 25 - While discussing TP sensor diagnosis: Technician A...Ch. 25 - While diagnosing the cause of a hard starting...Ch. 25 - While discussing testing OBD II system components:...Ch. 25 - When testing a frequency varying MAF: Technician A...Ch. 25 - Technician A says that a faulty MAF sensor can...Ch. 25 - While discussing the MIL on OBD 11 systems:...
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