Subaru 2002 IMPREZA Service Manual page 1167

2. ENGINE AND EMISSION CONTROL SYS-
TEM
• The Multipoint Fuel Injection (MFI) system is a
system that supplies the optimum air-fuel mixture
to the engine for all the various operating condi-
tions through the use of the latest electronic tech-
nology.
With this system fuel, which is pressurized at a con-
stant pressure, is injected into the intake air pas-
sage of the cylinder head. The injection quantity of
fuel is controlled by an intermittent injection system
where the electro-magnetic injection valve (fuel in-
jector) opens only for a short period of time, de-
pending on the quantity of air required for one cycle
of operation. In actual operation, the injection quan-
tity is determined by the duration of an electric
D: PREPARATION TOOL
ILLUSTRATION
B2M3876
B2M3877
GENERAL DESCRIPTION
TOOL NUMBER
24082AA190
(Newly adapted tool)
22771AA030
EN(TURBO)-7
pulse applied to the fuel injector and this permits
simple, yet highly precise metering of the fuel.
• Further, all the operating conditions of the engine
are converted into electric signals, and this results
in additional features of the system, such as large
improved adaptability, easier addition of compen-
sating element, etc.
The MFI system also has the following features:
• Reduced emission of harmful exhaust gases.
• Reduced in fuel consumption.
• Increased engine output.
• Superior acceleration and deceleration.
• Superior startability and warm-up perfor-
mance in cold weather since compensation is
made for coolant and intake air temperature.
DESCRIPTION
CARTRIDGE
SELECT MONITOR KIT
ENGINE (DIAGNOSTICS)
REMARKS
Troubleshooting for electrical
systems.
Troubleshooting for electrical
systems.
• English: 22771AA030 (With-
out printer)
• German: 22771AA070
(Without printer)
• French: 22771AA080
(Without printer)
• Spanish: 22771AA090
(Without printer)