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.
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