Subaru 2002 Impreza Service Manual page 81

CONTROL SYSTEM
Fuel lniection (Fuel System)
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:
0
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.)
0
Start increment factor:
This factor is used to increase the fuel injection duration only while the engine is being cranked
to improve its startability.
0
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.
0
After-start increment factor:
0
This factor is used to increase the fuel injection duration for a certain period immediately after
start of the engine to stabilize engine operation.
0
The increment depends on the coolant temperature at the start of the engine.
0
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.
0
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.
FU-31