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Automotive Technology: A Systems A...

6th Edition
Jack Erjavec + 1 other
ISBN: 9781133612315

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BuyFindarrow_forward

Automotive Technology: A Systems A...

6th Edition
Jack Erjavec + 1 other
ISBN: 9781133612315
Textbook Problem

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.

To determine

The incorrect option.

Explanation

The term fuel trim means the changes that have been made to the air fuel mixture by the PCM.

A positive fuel trim mean that a lean mixture of air and fuel is present in the fuel tank. In order, to increase the fuel amount in the fuel tank, the PCM increases the pulse width of the fuel injector...

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