SUBARU LEGACY 1996 Service Repair Manual
Page 1771 of 2890
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.
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
1. General
Page 1772 of 2890
2. SCHEMATIC (2200 cc FWD AND TAIWAN MODELS)
B2M0709A
4
2-7ON-BOARD DIAGNOSTICS II SYSTEM
1. General
Page 1773 of 2890
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 (AT vehicles only)
23EGR control solenoid valve (AT vehicles only)
24Radiator fan
25Radiator fan relay
26Pressure sources switching solenoid valve
27Knock sensor
28Back-pressure transducer (AT vehicles only)
29Front oxygen sensor
30Rear oxygen sensor (Except 2200 cc California model)
31Pressure sensor
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 (For Subaru select monitor)
43Data link connector (For Subaru select monitor and OBD-II
general scan tool)
44Two way valve
45Rear oxygen sensor (2200 cc California model only)
46Filter
5
2-7ON-BOARD DIAGNOSTICS II SYSTEM
1. General
Page 1774 of 2890
3. SCHEMATIC (2200 cc AWD EXCEPT TAIWAN
MODEL)
B2M0914A
6
2-7ON-BOARD DIAGNOSTICS II SYSTEM
1. General
Page 1775 of 2890
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 (AT vehicles only)
23EGR control solenoid valve (AT vehicles only)
24Radiator fan
25Radiator fan relay
26Pressure sources switching solenoid valve
27Front oxygen sensor
28Rear oxygen sensor (Except 2200 cc California model)
29Pressure sensor
30A/C compressor (With A/C models)
31Inhibitor switch
32CHECK ENGINE malfunction indicator lamp (MIL)
33Tachometer
34A/C relay (With A/C models)
35A/C control module (With A/C models)
36Ignition switch
37Transmission control module (TCM)
38Vehicle speed sensor
39Data link connector (For Subaru select monitor)
40Data link connector (For Subaru select monitor and OBD-II
general scan tool)
41Rear oxygen sensor (2200 cc California model)
42Knock sensor
43Back-pressure transducer (AT vehicles only)
44Filter
45Fuel tank pressure sensor
46Pressure control solenoid valve
47Fuel temperature sensor
48Fuel level sensor
49Vent control solenoid valve
50Air filter
7
2-7ON-BOARD DIAGNOSTICS II SYSTEM
1. General
Page 1776 of 2890
4. SCHEMATIC (2500 cc MODEL)
B2M0710A
8
2-7ON-BOARD DIAGNOSTICS II SYSTEM
1. General
Page 1777 of 2890
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
27Knock sensor
28Back-pressure transducer
29Front oxygen sensor
30Rear oxygen sensor
31Pressure sensor
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)
40Vehicle speed sensor
41Data link connector (Subaru select monitor)
42Data link connector (OBD-II general scan tool)
43Two way valve
44Filter
9
2-7ON-BOARD DIAGNOSTICS II SYSTEM
1. General
Page 1778 of 2890
5. SCHEMATIC (RHD MODEL)
B2M0828A
10
2-7ON-BOARD DIAGNOSTICS II SYSTEM
1. General
Page 1779 of 2890
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
27Knock sensor
28Back-pressure transducer
29Front oxygen sensor
30Rear oxygen sensor (Except California model)
31Pressure sensor
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)
40Vehicle speed sensor 2
41Data link connector (For Subaru select monitor)
42Data link connector (For Subaru select monitor and OBD-II
general scan tool)
43Two way valve
44Rear oxygen sensor (California model only)
45Filter
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
1. General
Page 1780 of 2890
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).
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
1. General