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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

While discussing EFI systems: Technician A says that the PCM provides the proper air-fuel ratio by controlling the fuel pressure. Technician B says that the PCM provides the proper air-fuel ratio by controlling injector pulse width. Who is correct?

a. Technician A

b. Technician B

c. Both A and B

d. Neither A nor B

To determine

Whether Technician A or Technician B is correct.

Explanation

The PCM decides the air-fuel ratio by looking up to the look-up tables registered in its memory. The PCM controls the injector pulse width by controlling its ground circuit using a driver circuit. The driver circuit energizes a solenoid which opens the fuel nozzle and when the solenoid is de-energized, the nozzle closes.

The fuel nozzle is opened when the solenoid is energized and closed when the solenoid is de-energized...

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