Subaru LEGACY 2002 Quick Reference Index page 53

2. CORRECTION FACTORS
The following factors are used to correct the basic duration of fuel injection in order to make the
air-fuel ratio meet the requirements of varying engine operating conditions:
! Air-fuel ratio feedback factor:
This factor is used to correct the basic duration of fuel injection in relation to the actual engine
speed. (See the next section for more detail.)
Start increment factor:
!
This factor is used to increase the fuel injection duration only while the engine is being cranked to
improve its startability.
! Coolant-temperature-dependent increment factor:
This factor is used to increase the fuel injection duration depending on engine coolant temperature
signals to facilitate cold starting. The lower the coolant temperature, the greater the increment.
After-start increment factor:
!
This factor is used to increase the fuel injection duration for a certain period immediately after
!
start of the engine to stabilize engine operation.
! The increment depends on the coolant temperature at the start of the engine.
! Wide-open-throttle increment factor:
This factor is used to increase the fuel injection duration depending on the relationship between
the throttle position sensor signal and manifold pressure sensor signal.
! Acceleration increment factor:
This factor is used to increase the fuel injection duration to compensate for a time lag between air
flow measurement and fuel injection control for better engine response to driver's pedal operation
during acceleration.
CONTROL SYSTEM
FU-33
Fuel Injection (Fuel System)