Automotive Technology
7th Edition
ISBN: 9781337794213
Author: ERJAVEC, Jack.
Publisher: Cengage,
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Chapter 31, Problem 8SA
What is indicated by a negative LTFT value?
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Chapter 31 Solutions
Automotive Technology
Ch. 31 - List four service precautions for working on the...Ch. 31 - What is indicated by a LTFT reading of 24 percent?Ch. 31 - Describe how testing GDI fuel systems differs from...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 - What problem may result from dirt buildup on an...Ch. 31 - What is the difference between STFT and LTFT?
Ch. 31 - True or False? The signals from an air-fuel ratio...Ch. 31 - Prob. 2TFCh. 31 - Which of the following is the most likely cause of...Ch. 31 - The PCM checks for a closed throttle plate each...Ch. 31 - Which of the following would not cause a...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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- What is a GFCI?arrow_forwardName the two basic types of compression gauges.arrow_forwardWhile selecting the proper RTV for a particular application: Technician A uses RTV in a black tube for all high-temperature applications. Technician B uses RTV in a red tube for most general applications. Who is correct? Technician A Technician B Both A and B Neither A nor Barrow_forward
- 7arrow_forwardWhat is the correct procedure for checking an oxygen sensor with a DMM?arrow_forwardWhile discussing spark plugs: Technician A says that too narrow of a spark plug gap can cause a rough idle and premature wear of the electrodes. Technician B says that a spark plug with the wrong reach can cause preignition. Who is correct? a. Technician A b. Technician B c. Both A and B d. Neither A nor Barrow_forward
- While diagnosing an idle speed problem: Technician A says that higher-than-normal TP signals at idle will cause the IAC to close, which will decrease idle speed. Technician B says that if the resistance of the ECT is too low, a lower-than-normal voltage signal is sent to the PCM, which interprets this as a hot engine and will close the IAC to decrease speed. Who is correct? a. Technician A b. Technician B c. Both A and B d. Neither A nor Barrow_forwardTrue or False? An A/F ratio sensor can be tested in the same way as an oxygen sensor.arrow_forwardTrue or False? The MIN/MAX function on some DMMs can be used to check for electrical noise.arrow_forward
- Explain working principle of hook gauges?arrow_forwardTechnician A says that many oil pressure sensors are typically variable resistors that change resistance based on pressure changes. Technician B says that a sensor substitution box can be used in place of the sensor while observing the reaction of the oil pressure gauge on the dash. Who is correct? Select one: a. Technician A b. Technician B c. Both A and B d. Neither A nor Barrow_forwardDescribe how engine misfire is detected in an OBD II system.arrow_forward
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