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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 vehicle is setting a lean exhaust code and the HO2S data shows the exhaust to be very lean. Technician A says a malfunctioning AIR system may be the cause. Technician B says a clogged EGR may be the cause. Who is correct?

a. Technician A only

b. Technician B only

c. Both A and B

d. Neither A nor B

To determine

The technician with correct approach when a vehicle is setting a lean exhaust code and the HO2S data shows the exhaust to be very lean.

Explanation

Given:

Technician A says a malfunctioning AIR system may be the cause.

Technicians B says a clogged EGR valve may be the cause.

When the engine is running at a normal temperature, if the AIR system pumps excess air into the exhaust port, this additional air causes lean signals from the HO2S or sensors. Now the PCM respond to these signals and provide an extra amount of air-fuel ratio...

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