SUBARU LEGACY 1997 Service Repair Manual

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

2. SCHEMATIC
B2M0469A
11
2-7ON-BOARD DIAGNOSTICS II SYSTEM
1. General

2. Electrical Components Location
A: ENGINE
1. MODULE
OBD0003E
B2M0430H
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)
12
2-7ON-BOARD DIAGNOSTICS II SYSTEM
2. Electrical Components Location

OBD0004BB2M0431B
OBD0005GB2M0432C
OBD0006EB2M0433C
B2M0470A
13
2-7ON-BOARD DIAGNOSTICS II SYSTEM
2. Electrical Components Location

2. SENSOR
B2M1169D
1Pressure sensor

2Mass air flow sensor

3Engine coolant temperature sensor

4Throttle position sensor
5Knock sensor

6Camshaft position sensor

7Crankshaft position sensor
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
2. Electrical Components Location

B2M0776AB2M1034A
B2M1690AB2M1035A
B2M1691AOBD0015A
B2M0213B
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
2. Electrical Components Location

B2M0471A
B2M0472A
8Front oxygen sensor

9Rear oxygen sensor (Except 2200 cc California spec.
vehicles)
10Rear oxygen sensor (2200 cc California spec. vehicles)

11Front catalytic converter

12Rear catalytic converter
OBD0018AOBD0019E
16
2-7ON-BOARD DIAGNOSTICS II SYSTEM
2. Electrical Components Location

B2M0473COBD0524C
OBD0525C
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
2. Electrical Components Location

OBD0003F
B2M0430F
1Fuel level sensor

2Fuel temperature sensor (2200 cc AWD except Taiwan spec.
vehicles)
3Fuel tank pressure sensor (2200 cc AWD except Taiwan
spec. vehicles)

4Fuel sub level sensor
18
2-7ON-BOARD DIAGNOSTICS II SYSTEM
2. Electrical Components Location

B2M0921AB2M0922A
B2M0946A
19
2-7ON-BOARD DIAGNOSTICS II SYSTEM
2. Electrical Components Location