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.

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