Fuel Injection Duration

Fuel injection duration is basically determined as indicated below:

• While cranking the engine:

  The duration defined below is used.

  • Duration of fuel injection during engine start-up.....Determined according to the engine coolant temperature detected by the engine coolant temperature sensor.
• During normal operation:

  The duration is determined as follows:

  Basic duration of fuel injection x Correction factors + Voltage correction time

  • Basic duration of fuel injection.....The basic length of time fuel is injected. This is determined by two factors - the amount of intake air detected by the air flow sensor and the engine speed monitored by the crankshaft position sensor.
  • Correction factors.....See the next section.
  • Voltage correction time.....This is added to compensate for the time lag before operation of injector that results from variation in the battery voltage.