Tech Manual for Erjavec's Automotive Technology: A Systems Approach
6th Edition
ISBN: 9781133933731
Author: ERJAVEC, Jack, Thompson, Rob
Publisher: Delmar Cengage Learning
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Textbook Question
Chapter 42, Problem 1RQ
Although computers receive different information from a variety of sensors, the decisions for shifting are actually based on more than the inputs. What are they based on?
Expert Solution & Answer
To determine
The decisions shift or not to shift in the automatic transmission.
Answer to Problem 1RQ
The decisions to shift or not to shift in automatic transmission are based on the shift schedule and logic.
Explanation of Solution
Transmission control module (TCM) is designed or programmed in such a way that it receives signals from sensors, engine related or driver-controlled sensors to control the shift timing, torque converter clutch and shift feel. But the decisions to shift or not to shift is based on the shift schedule and logic. In shift schedule composed of shift points and are precisely selected based on the signals from appropriate sensors. Shift schedule logic select the appropriate gear. Other inputs TCM used to control shift speed are:
Throttle position.
Manifold absolute pressure.
Mass airflow.
Intake air temperature.
Barometric pressure.
Engine coolant temperature.
Crank shaft position.
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Chapter 42 Solutions
Tech Manual for Erjavec's Automotive Technology: A Systems Approach
Ch. 42 - Although computers receive different information...Ch. 42 - What happens if the TCM determines that the...Ch. 42 - How can air pressure be used to check an...Ch. 42 - True or False? On most late-model EAT systems,...Ch. 42 - Prob. 5RQCh. 42 - List five things that could cause incorrect shift...Ch. 42 - Most late-model transmission control systems have...Ch. 42 - What inputs are of prime importance to a computer...Ch. 42 - What are the advantages of using electronic...Ch. 42 - Voltage generation devices are typically used to...
Ch. 42 - Which of the following is not a voltage-generating...Ch. 42 - True or False? The neutral safety switch and...Ch. 42 - A glitch appears in the waveform of a vehicle...Ch. 42 - Prob. 14RQCh. 42 - Which of the following would probably not be...Ch. 42 - Technician A says that some systems use a special...Ch. 42 - Technician A says that shift solenoids direct...Ch. 42 - Technician A says that throttle position is an...Ch. 42 - Technician A says that a faulty TP sensor can...Ch. 42 - Technician A says that some shift solenoids can be...Ch. 42 - An electronically controlled transmission has...Ch. 42 - While discussing transmission adaptive learning:...Ch. 42 - While discussing valve body assemblies in...Ch. 42 - A hot-wire MAF has low resistance across it when...Ch. 42 - While diagnosing the cause of TCC shudder:...
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