Page 1209 of 2248
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 improved
adaptability, easier addition of compensating element, etc.
The MFI system also has the following features:
1) Reduced emission of harmful exhaust gases.
2) Reduced in fuel consumption.
3) Increased engine output.
4) Superior acceleration and deceleration.
5) Superior startability and warm-up performance in cold
weather since compensation is made for coolant and
intake air temperature.
3
2-7ON-BOARD DIAGNOSTICS II SYSTEM
1. General
Page 1210 of 2248
2. SCHEMATIC
OBD0001A
4
2-7ON-BOARD DIAGNOSTICS II SYSTEM
1. General
Page 1211 of 2248

1Engine control module (ECM)
2Ignition coil
3Ignitor
4Crankshaft position sensor
5Camshaft position sensor
6Throttle position sensor
7Fuel injectors
8Pressure regulator
9Engine coolant temperature sensor
10Mass air flow sensor
11Idle air control solenoid valve
12Purge control solenoid valve
13Fuel pump
14PCV valve
15Air cleaner
16Canister
17Main relay
18Fuel pump relay
19Fuel filter
20Front catalytic converter
21Rear catalytic converter
22EGR valve
23EGR control solenoid valve
24Radiator fan
25Radiator fan relay
26Pressure sources switching solenoid valve (AT vehicles only)
27Knock sensor
28Back-pressure transducer (AT vehicles only)
29Front oxygen sensor
30Rear oxygen sensor
31Pressure sensor (AT vehicles only)
32A/C compressor
33Inhibitor switch
34CHECK ENGINE malfunction indicator lamp (MIL)
35Tachometer
36A/C relay
37A/C control module
38Ignition switch
39Transmission control module (TCM) (AT vehicles only)
40ABS/TCS control module (TCS equipped models)
41Vehicle speed sensor
42Data link connector (Subaru select monitor)
43Data link connector (OBD-II general scan tool)
44Two way valve
5
2-7ON-BOARD DIAGNOSTICS II SYSTEM
1. General
Page 1212 of 2248
B: AUTOMATIC TRANSMISSION
1. ELECTRONIC-HYDRAULIC CONTROL SYSTEM
The electronic-hydraulic control system consists of various
sensors and switches, a transmission control module
(TCM) and the hydraulic controller including 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 sys-
tem detects various operating conditions from various input
signals and sends output signals to shift solenoids 1, 2 and
3 and duty solenoids A, B and C (a total of six solenoids).
6
2-7ON-BOARD DIAGNOSTICS II SYSTEM
1. General
Page 1213 of 2248
2. SCHEMATIC
B2M0619A
7
2-7ON-BOARD DIAGNOSTICS II SYSTEM
1. General
Page 1214 of 2248
2. Electrical Components Location
A: ENGINE
1. MODULE (LHD MODEL)
OBD0003A
1Engine control module (ECM)
2Data link connector (for Subaru select monitor only)
3Data link connector (for Subaru select monitor and OBD-II
general scan tool)
4Test mode connector
5CHECK ENGINE malfunction indicator lamp (MIL)
OBD0004AOBD0005D
OBD0006BOBD0008A
8
2-7ON-BOARD DIAGNOSTICS II SYSTEM
2. Electrical Components Location
Page 1215 of 2248
2. MODULE (RHD MODEL)
B2M0430A
1Engine control module (ECM)
2Data link connector (for Subaru select monitor only)
3Data link connector (for Subaru select monitor and OBD-II
general scan tool)
4Test mode connector
5CHECK ENGINE malfunction indicator lamp (MIL)
B2M0431AB2M0432A
B2M0433AOBD0008A
9
2-7ON-BOARD DIAGNOSTICS II SYSTEM
2. Electrical Components Location
Page 1216 of 2248
3. SENSOR
OBD0009A
1Pressure sensor (AT vehicles only)
2Mass air flow sensor
3Engine coolant temperature sensor
4Throttle position sensor
5Knock sensor
6Camshaft position sensor
7Crankshaft position sensor
OBD0010AOBD0011A
10
2-7ON-BOARD DIAGNOSTICS II SYSTEM
2. Electrical Components Location