1997 SUBARU LEGACY differential

1. Supplemental Restraint System
“Airbag”
Airbag system wiring harness is routed near the transmis-
sion control module (TCM).

All Airbag system wiring harness and connectors
are colored yellow. Do not use electrical test equip-
ment on these circuit.

Be careful not to damage Airbag system wiring har-
ness when performing diagnostics and servicing the
TCM.
B3M0173A
2. Pre-inspection
1. ATF LEVEL
Make sure that ATF level is in the specification.
B3M0174A
2. FRONT DIFFERENTIAL OIL LEVEL
Make sure that front differential oil level is in the specifica-
tion.
2
3-2AUTOMATIC TRANSMISSION AND DIFFERENTIAL
1. Supplemental Restraint System“Airbag”- 2. Pre-inspection

G3M0717
3. OPERATION OF SHIFT SELECTOR LEVER
WARNING:
Stop the engine while checking operation of selector
lever.
1) Check that selector lever does not move from“N”to“R”
without pushing the button.
2) Check that selector lever does not move from“R”to“P”
without pushing the button.
3) Check that selector lever does not move from“P”to“R”
without pushing the button.
4) Check that selector lever does not move from“3”to“2”
without pushing the button.
3
3-2AUTOMATIC TRANSMISSION AND DIFFERENTIAL
2. Pre-inspection

3. Electrical Components Location
1. SENSOR AND CONTROL MODULE
B3M0637A
B3M0638A
1Throttle position sensor

2Dropping resistor

3Vehicle speed sensor 2

4Inhibitor switch

5ECM

6Vehicle speed sensor 1 (AWD)

7Vehicle speed sensor 1 (FWD)

8TCM
9Data link connector (for Subaru select monitor only)

10Data link connector (for Subaru select monitor and OBD-II
general scan tool)

11Diagnosis connector

12Diagnosis terminal

13AT OIL TEMP indicator light
(AT diagnostic indicator light)
4
3-2AUTOMATIC TRANSMISSION AND DIFFERENTIAL
3. Electrical Components Location

B2M0155AOBD0046A
B2M0211A
B3M0182C
B3M0183AB2M1043C
B3M0184AB3M0185A
5
3-2AUTOMATIC TRANSMISSION AND DIFFERENTIAL
3. Electrical Components Location

B3M0443GB3M0445C
OBD0005COBD0006A
H3M1161AOBD0008D
6
3-2AUTOMATIC TRANSMISSION AND DIFFERENTIAL
3. Electrical Components Location

2. SOLENOID
B3M0187A
1Duty solenoid A

2Solenoid 2

3Solenoid 1

4Solenoid 3
5Duty solenoid B

6ATF temperature sensor

7Duty solenoid C (AWD)
B3M0188AB2M0464B
B3M0190A
7
3-2AUTOMATIC TRANSMISSION AND DIFFERENTIAL
3. Electrical Components Location

4. Schematic
B3M0376A
1Ignition switch

2Combination meter

3Speedometer circuit

4Inhibitor switch

5Vehicle speed sensor 2

6Vehicle speed sensor 1

7Throttle position sensor

8Diagnosis switch

9FWD switch (AWD)
10Data link connector

11ABS control module

12Engine speed signal

13Torque control signal

14Torque control cut signal

15Mass air flow signal

16ATF temperature sensor

17Dropping resistor
18Duty solenoid A

19Duty solenoid B

20Duty solenoid C (AWD)

21Shift solenoid 1

22Shift solenoid 2

23Shift solenoid 3

24Brake switch

25Cruise set switch
8
3-2AUTOMATIC TRANSMISSION AND DIFFERENTIAL
4. Schematic

5. Transmission Control Module (TCM)
I/O Signal
OBD0093A
Check with ignition switch ON.
ContentConnector
No.Terminal
No.Measuring conditions Voltage (V)
Back-up power supply B56 14 Ignition switch OFF 10—16
Ignition power supplyB54 6
Ignition switch ON (with engine OFF) 10—16
B55 1
Inhibitor switch“P”range switch B56 9Select lever in“P”range Less than 1
Select lever in any other than“P”
range (except“N”range)More than 8
“N”range switch B56 8Select lever in“N”range Less than 1
Select lever in any other than“N”
range (except“P”range)More than 8
“R”range switch B56 10Select lever in“R”range Less than 1
Select lever in any other than“R”
rangeMore than 6
“D”range switch B54 1Select lever in“D”range Less than 1
Select lever in any other than“D”
rangeMore than 6
“3”range switch B54 2Select lever in“3”range Less than 1
Select lever in any other than“3”
rangeMore than 6
“2”range switch B54 3Select lever in“2”range Less than 1
Select lever in any other than“2”
rangeMore than 6
“1”range switch B54 4Select lever in“1”range Less than 1
Select lever in any other than“1”
rangeMore than 6
Diagnosis switch B56 6Diagnosis connector connected Less than 1
Diagnosis connector disconnected More than 6
Brake switch B56 7Brake pedal depressed. More than 10.5
Brake pedal released. Less than 1
ABS signal B56 5ABS switch ON Less than 1
ABS switch OFF More than 6.5
AT diagnostic signal B55 12Ignition switch ON (With engine OFF) Less than 1
Ignition switch ON (With engine ON) More than 10
9
3-2AUTOMATIC TRANSMISSION AND DIFFERENTIAL
5. Transmission Control Module (TCM) I/O Signal