Subaru IMPREZA 2002 Service Manual page 332

GENERAL DESCRIPTION
E NG IN E (DIAGNOSTICS)
The OBD-II diagnostics procedure is different
from the usual diagnostics procedure. When trou-
bleshooting OBD-II vehicles, connect Subaru Se-
lect Monitor or the OBD-ll general scan tool to the
vehicle.
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
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
2. ENGINE AND EMISSION CONTROL SYS-
D: PREPARATION TOOL
ILLUSTRATION
B2M3876
B2M3877
TOOL NUMBER
24082AA150
(New adopted tool)
22771 AA030
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.
3. AUTOMATIC TRANSMISSION AND
TEM
The electronic-hydraulic control system consists of
various sensors and switches, a transmission con-
trol module (TCM) and the hydraulic controller in-
cluding solenoid valves. The system controls the
transmission proper including shift control, lock-up
control, overrunning clutch control, line pressure
control and shift timing control. It also controls the
AWD transfer clutch. In other words, the system
detects various operating conditions from various
input signals and sends output signals to shift sole-
noids 1, 2 and low clutch timing solenoid and 2-4
brake timing solenoid, line pressure duty solenoid,
lock-up duty solenoid, transfer duty solenoid and 2-
4 brake duty solenoid (a total of eight solenoids).
ELECTRONIC-HYDRAULIC CONTROL SYS-
DESCRIPTION
SARTRIDGE
SELECT MONITOR KIT
REMARKS
Troubleshooting for electrical
systems.
Troubleshooting for electrical
systems.
English: 22771AA030 (With-
out printer)
German: 22771AA070
(Without printer)
French: 22771 AA080
(Without printer)
Spanish: 22771 AA090
(Without printer)
EN( SOH C)-8