Ineffective Injection Time

The fuel injector is driven by the Powertrain Control Module (PCM). There is a delay between when the PCM signals the fuel injector ON and when the injector actually opens and provides fuel. This delay is known as ineffective injection time and is part of the normal event of electrical flow through the fuel injector solenoid coil.

Because ineffective injection time varies with system voltage, the PCM takes voltage readings and computes the required offset necessary for the proper timing of the fuel injector signal.