Subaru Forester 2004 Service Manual page 8

2. ENGINE AND EMISSION CONTROL SYS-
TEM
• MFI system is a system that supplies the opti-
mum air-fuel mixture to the engine for all the vari-
ous operating conditions through the use of the
latest electronic technology.
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 sig-
D: PREPARATION TOOL
ILLUSTRATION
ST24082AA230
ST22771AA030
General Description
TOOL NUMBER DESCRIPTION
24082AA230 CARTRIDGE
(Newly adopted tool)
22771AA030 SUBARU SELECT
MONITOR KIT
EN(H4DOTC 2.5)-7
nal 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.
• Excellent engine start and warm-up perfor-
mance by the correction of engine coolant tem-
perature and intake air temperature.
Troubleshooting for electrical system.
Troubleshooting for electrical system.
• English: 22771AA030 (Without printer)
• German: 22771AA070 (Without printer)
• French: 22771AA080 (Without printer)
• Spanish: 22771AA090 (Without printer)
ENGINE (DIAGNOSTIC)
REMARKS