To provide accurate fuel injection duration during cranking periods, the ECU uses a program which determines a basic injection volume based on engine coolant temperature. Once a basic injection duration is calculated, corrections are made for intake air temperature and battery voltage (which is typically low under cranking load).
• Basic injection duration while cranking is increased at low coolant temperatures.
Injection duration while cranking is corrected for battery voltage by increasing injection duration at lower voltage.
The graph represents the basic cranking enrichment strategy used by the ECU. Note that at temperatures below freezing, basic injection duration increases drastically to overcome the poor vaporization characteristics of fuel at these temperatures.
Injection duration while cranking is corrected for intake air temperature by increasing duration at low intake air temperatures.
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