After Startup Enrichment

To stabilize the engine immediately after starting, for a short period of time after starting, the ECU supplies extra fuel to the engine to ensure a smooth transition from cranking to running. The maximum enrichment value is determined by the coolant temperature signal, THW.

Basic Injection Calculation Once the engine has stabilized, engine rpm information and intake air volume measurements are used to determine basic injection duration.

• As intake air volume increases, injector duration increases.

• As engine rpm increases, injector frequency increases.

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