SUBARU FORESTER 2004 Service Repair Manual

EN(H4DOTC 2.5)-7
ENGINE (DIAGNOSTIC)
General Description
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-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.
D: PREPARATION TOOL
ILLUSTRATION TOOL NUMBER DESCRIPTION REMARKS
24082AA230
(Newly adopted tool)CARTRIDGE Troubleshooting for electrical system.
22771AA030 SUBARU SELECT
MONITOR KITTroubleshooting for electrical system.
 English: 22771AA030 (Without printer)
 German: 22771AA070 (Without printer)
 French: 22771AA080 (Without printer)
 Spanish: 22771AA090 (Without printer)
ST24082AA230
ST22771AA030

EN(H4DOTC 2.5)-8
ENGINE (DIAGNOSTIC)
Electrical Component Location
4. Electrical Component Location
A: LOCATION
1. ENGINE
 CONTROL MODULE
(1) Engine control module (ECM) (3) Test Mode Connector (5) Data link connector
(2) Malfunction indicator light (4) Diagnosis connector
EN-00072
(3) (2)
(4) (1)(5)
EN-00235
(1)
(2)EN-00004
PI-00014
(4)
(3)
AT-00326 (5)

EN(H4DOTC 2.5)-9
ENGINE (DIAGNOSTIC)
Electrical Component Location
 SENSOR
(1) Manifold absolute pressure sen-
sor(3) Electronic throttle control (7) Mass air flow and intake air tem-
perature sensor
(4) Knock sensor
(2) Engine coolant temperature sen-
sor(5) Camshaft position sensor (8) Tumble generator valve position
sensor
(6) Crankshaft position sensor
EN-02008
(1)
(7) (6) (4) (8)(2)
(3)(5)

EN(H4DOTC 2.5)-10
ENGINE (DIAGNOSTIC)
Electrical Component Location
EN-02009
(3)
(1)
(2)
EN-00295
EN-00297 (4)EN-01798(5)
EN-00299 (6)
(7)
EN-00300
(8)
EN-00301

EN(H4DOTC 2.5)-11
ENGINE (DIAGNOSTIC)
Electrical Component Location
(1) Front oxygen (A/F) sensor (3) Exhaust gas temperature sensor (5) Rear oxygen sensor
(2) Precatalytic converter (4) Front catalytic converter (6) Rear catalytic converter
EN-02351 (1)
(5)
(6)
(4)
(2)(3)

EN(H4DOTC 2.5)-12
ENGINE (DIAGNOSTIC)
Electrical Component Location
(1) Fuel level sensor (2) Fuel sub level sensor
(1)
EN-00303EN-00304
(3)
(2)
(4)
EN-00305EN-02352
(5)
(6)
EN-00309(2)
(1)

EN(H4DOTC 2.5)-13
ENGINE (DIAGNOSTIC)
Electrical Component Location
 SOLENOID VALVE, ACTUATOR, EMISSION CONTROL SYSTEM PARTS AND IGNITION SYSTEM
PARTS
(1) Wastegate control solenoid valve (3) Ignition coil (5) Oil flow control solenoid valve
(4) Tumble generator valve actuator (2) Purge control solenoid valve (6) Injector
EN-00310 (1)EN-00311 (2)
EN-02411
(4)(4) (1)
(5)(5)(3)(6)(2)(3)(5)(6)

EN(H4DOTC 2.5)-14
ENGINE (DIAGNOSTIC)
Electrical Component Location
EN-00313(1)EN-01804
(2)
EN-01805(3)EN-01806
(4)
EN-02011
(5)
FU-02412(6)

EN(H4DOTC 2.5)-15
ENGINE (DIAGNOSTIC)
Electrical Component Location
(1) Fuel pump (4) Fuel pump controller (7) Fan mode relay
(2) Main relay (5) Radiator main fan relay (8) Starter
(3) Fuel pump relay (6) Radiator sub fan relay
EN-00099
(4)
(3)
(8)(1)
(7)(6)(5)(3)(2)
(2)(4)
(1)
EN-00100
(2)
EN-01268
FU-00130(3)
(4)
EN-00101

EN(H4DOTC 2.5)-16
ENGINE (DIAGNOSTIC)
Electrical Component Location
2. TRANSMISSION
 SOLENOID VALVE & SWITCH (MT MODEL)
(1) Neutral Position Switch
EN-00102
(6)
(7)
(5)
EN-00103
(8)
EN-00192 (1)