Fuel Injection Overview

The Engine Control Module calculates the correct injection timing on the basis of:
- Battery voltage
- Engine speed,
- Air flow or air mass,
- Oxygen sensor signal,
- Engine temperature,
- Throttle position,






The mixture is varied by the opening time (ms) of the fuel injectors. The vehicle battery voltage is taken into consideration in calculating the injection timing. With lower than normal battery voltage, the injectors must be activated earlier to get the valves open in time (dwell) for optimum injection timing.