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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

A system may fail the catalyst monitor test for all of these reasons, except.

  1. defective upstream or downstream oxygen sensor circuits

  • a leaking exhaust
  • fuel contaminants
  • ignition system faults
  • To determine

    The correct option.

    Explanation

    Given information:

    A system may fail the catalyst monitor test for all of these reasons, except__.

    1. A defective upstream or downstream oxygen sensor circuits
    2. A leaking exhaust
    3. Fuel contaminants
    4. Ignition system faults

    A catalyst monitor test is done by using two oxygen sensors. The function of the first sensor is to provide feedback to the computer control unit, PCM to manage fuel control. The other oxygen sensor is used for knowing the efficiency of catalytic convertor. It also manages fuel control. Sometimes, downstream oxygen sensor is known as catalyst monitor sensor. The efficiency monitor for the catalyst helps in understanding the working of the catalyst. This is done by comparing the signals from the two oxygen sensors.

    One oxygen sensor is mounted in the passage of the exhaust manifold, the second oxygen sensor is mounted below the exhaust manifolds. The first is heated oxygen sensor.

    The second oxygen sensor helps in preventing from the catalytic converter from condensation of ceramic material. These helps in storing oxygen to help the engine by providing the oxygen when the engine is running low on a lean mixture.

    Catalyst monitor may fail if there is any leak in the exhaust...

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