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 "NTILDE" the amount of intake air detected by the manifold absolute pressure 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.