Automotive Technology: A Systems Approach (MindTap Course List)
6th Edition
ISBN: 9781133612315
Author: Jack Erjavec, Rob Thompson
Publisher: Cengage Learning
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Textbook Question
Chapter 31, Problem 5RQ
The PCM checks for a closed throttle plate each time the engine starts. This becomes the base for all throttle settings and can be viewed by looking at the PID with the throttle closed. Which of the following would not cause an abnormal reading and a higher-than-normal idle speed?
a. A bad TP sensor
b. A bad IAC valve
c. Loose or worn throttle plates
d. Excessive noise in the TP or related circuits
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Students have asked these similar questions
A throttle position sensor has _________ .
a- a 0-5 volts signal output terminal
b- a 5-volt reference input terminal
c- all answers are correct
d- a ground terminal
While discussing throttle-by-wire systems: Technician A says that a spring on the throttle shaft provides the limp-home feature. Technician B says that most systems have redundant processors and the TP and accelerator pedal sensors send redundant input signals. Who is correct?A. Tech A
B. Tech B
C. Both A and B
D. Neither A nor B
Choose the statements that best describe an on/off pressure control system.
a. valve position is either fully on or fully off
b. can cause rapid switching of valve positions
c. maintains pressure between upper and lower limits
d. valve position is between fully on or fully off
e. maintains pressure at a specified setpoint
f. uses a controller with tuning parameters
Chapter 31 Solutions
Automotive Technology: A Systems Approach (MindTap Course List)
Ch. 31 - List four service precautions for working on the...Ch. 31 - What is indicated by a LTFT reading of 24 percent?Ch. 31 - What is the correct procedure for checking an...Ch. 31 - What is the difference between STFT and LTFT?Ch. 31 - The PCM checks for a closed throttle plate each...Ch. 31 - Which of the following is a likely cause of a lean...Ch. 31 - What problem may result from dirt buildup on an...Ch. 31 - Which of the following would not cause a...Ch. 31 - What is the correct way to test an injector with...Ch. 31 - What is the difference between the pulse width and...
Ch. 31 - How can you use a dual trace scope to make sure...Ch. 31 - What are three possible problems that can allow...Ch. 31 - What is the purpose of having two accelerator...Ch. 31 - What is indicated by a negative LTFT value?Ch. 31 - True or False? The signals from an air-fuel ratio...Ch. 31 - While discussing the causes of...Ch. 31 - While discussing IAC valve diagnosis: Technician A...Ch. 31 - While discussing IAC motor removal, service, and...Ch. 31 - While discussing injector testing: Technician A...Ch. 31 - While discussing airflow sensors: Technician A...Ch. 31 - While discussing scan tool diagnosis of fuel...Ch. 31 - While discussing a high idle speed problem:...Ch. 31 - While discussing the causes of a rich air-fuel...Ch. 31 - While diagnosing an idle speed problem: Technician...Ch. 31 - While looking at fuel trim values: Technician A...
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