Closed Loop Air Fuel Ratio Correction

Under certain operating conditions, primarily cruise and idle, the ECU corrects the injection duration value based on signals from the exhaust oxygen sensor. This feedback correction is necessary to promote better vehicle emissions control.

Injector

Injector

By achieving more accurate fuel metering, the oxygen content of the exhaust stream is held within a very narrow range which supports the most efficient operation of the three-way catalyst (TWC).

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

Don't pay hundreds of dollars to find out what is wrong with your car. This book is dedicated to helping the do it yourself home and independent technician understand and use OBD-II technology to diagnose and repair their own vehicles.

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