Automotive Technology: A Systems Approach (MindTap Course List)
Automotive Technology: A Systems Approach (MindTap Course List)
6th Edition
ISBN: 9781133612315
Author: Jack Erjavec, Rob Thompson
Publisher: Cengage Learning
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Chapter 30, Problem 15RQ

Which of the following statements about fuel trim is not true?

a. A positive fuel trim value means that the PCM detects a lean mixture and is decreasing the pulse width to add more fuel to the mixture.

b. Short-term fuel trim represents changes made immediately in response to HO2S signals.

c. Long-term fuel trim represents changes made to set a new base pulse width.

d. Long-term fuel trim responds to the trends of the short-term fuel trim.

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Automotive Technology: A Systems Approach (MindTap Course List)

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