Review of Injection Duration Theory

Final fuel injection duration is a function of three steps:

• Basic injection duration

• Duration corrections for operating conditions

• Battery voltage correction

Basic injection duration is based on engine load, speed, and a correction factor called fuel trim. Duration corrections for operating conditions are based on the sensors listed below. These are adjustments to the basic injection duration based on changing operating conditions.

• Engine Coolant Temperature (ECT)

• Intake Air Temperature (IAT)

Battery voltage correction is an adjustment to the final injection duration to account for variations in injector opening time caused by changing operating voltage.

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.

Get My Free Ebook


Post a comment