1996 SUBARU LEGACY brake

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
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3-2AUTOMATIC TRANSMISSION AND DIFFERENTIAL
5. Transmission Control Module (TCM) I/O Signal

6. Diagnostic Chart for On-board
Diagnostic System
A: BASIC DIAGNOSTICS PROCEDURE
TROUBLE OCCURS.
INTERVIEW
1. Oil level check [W2A1], [W2A2].>
2. Oil leak check [W2A3].>
3. Brake band adjustment 3-2 [W2B1].>
4. Stall test
5. Line pressure test [W3C0].>
6. Transfer clutch pressure test

7. Time lag test [W3B0].>
8. Road test
BASIC CHECKS
TROUBLE INDICATION (AT OIL
TEMP INDICATOR)
Not indicated.
Indicated.
ON-BOARD
DIAGNOSTICS
Trouble code
Inspection using General Diagnostic
Table 3-2 [T900].OK
Inspection using Diagnostic Chart
with Select Monitor 3-2 [T800]
Not OK
No trouble code
Repair.Check in
accordance with
trouble code 3-2
[T700].

CLEAR MEMORY
Confirmation test
(ON-BOARD DIAGNOSTICS)
No trouble codeTrouble code
End








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3-2AUTOMATIC TRANSMISSION AND DIFFERENTIAL
6. Diagnostic Chart for On-board Diagnostic System

C: TROUBLE CODE 13
—SHIFT SOLENOID 3—
DIAGNOSIS:
Output signal circuit of shift solenoid 3 is open or shorted.
TROUBLE SYMPTOM:
Ineffective engine brake with shift lever in“3”
1. Check harness and connectors between TCM
and shift solenoid 3.
OK
Not OK
Repair or replace harness connectors.
2. Check shift solenoid 3’s ground line.
OK
Not OK
Repair ground line.
3. Check shift solenoid 3.
OK
Not OK
Replace shift solenoid 3.
4. Check output signal emitted from TCM.
OK
Not OK

Repair TCM connector terminal poor contact.

Replace TCM.

Repair TCM connector terminal poor contact.
OBD0452
OBD0454A
1. CHECK HARNESS AND CONNECTORS BETWEEN
TCM AND SHIFT SOLENOID 3.
1) Turn ignition switch to OFF.
2) Disconnect connectors from TCM and transmission.
3) Measure resistance of harness connector between
TCM and transmission connector.
Connector & terminal / Specified resistance:
(B55) No. 15—(B11)No.1/1Ω, or less
(B55) No. 10—(B11)No.4/1Ω, or less




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3-2AUTOMATIC TRANSMISSION AND DIFFERENTIAL
7. Diagnostic Chart with Trouble Code

K: TROUBLE CODE 31
—THROTTLE POSITION SENSOR—
DIAGNOSIS:
Input signal circuit of throttle position sensor is open or
shorted.
TROUBLE SYMPTOM:
Shift point too high or too low; engine brake not effected in
“3”range; excessive shift shock; excessive tight corner
“braking”
1. Check harness connector between TCM and
throttle position sensor.
OK
Not OK
Repair or replace harness connectors.
2. Check throttle position sensor.
OK
Not OK
Replace throttle position sensor.
3. Check input signal for TCM.
Not OK
OK

Repair TCM connector terminal poor contact.

Replace TCM.
4. Check power supply to throttle position
sensor.
OK
Not OK
Repair or replace harness connectors.

Repair TCM connector terminal poor contact.

Replace TCM.
B2M0613




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3-2AUTOMATIC TRANSMISSION AND DIFFERENTIAL
7. Diagnostic Chart with Trouble Code

2. ON←→OFF SIGNAL LIST
Mode LED No. Signal name Display LED“ON”requirements Page
FA 01 FWD switch FF When fuse is installed in FWD switch.—
2 Kick-down switch KD—
3—— —
4—— —
5 Brake switch BR When brake switch is turned ON.—
6 ABS switch AB When ABS signal is entered.—
7 Cruise control set CR When cruise control is set.—
8 Power switch PW—
9—— —
10—— —
FA 11 P/N range switch NP When P or N range is selected.—
2 R range switch RR When R range is selected.—
3 D range switch RD When D range is selected.—
4 3 range switch R3 When 3 range is selected.—
5 2 range switch R2 When 2 range is selected.—
6 1 range switch R1 When 1 range is selected.—
7 Diagnosis switch SS When diagnosis switch is turned ON. 65
8—— —
9—— —
10—— —
NOTE; LED Nos. 2 and 8 cannot be turned on.
3. DIAGNOSIS MODE
Mode Contents Abbr. Contents of display
FB0On-board
diagnosticsDIAG.U Current trouble code determined by on-board diagnostics.
FB1On-board
diagnosticsDIAG.MPrevious trouble code stored in memory by on-board
diagnostics.
FC0 Back-up clear—Function of clearing trouble code stored in memory.
55
3-2AUTOMATIC TRANSMISSION AND DIFFERENTIAL
8. Diagnostic Chart with Select Monitor

DISPLAY
LED No. Signal name Symbol
1 FWD switch FF
2 Kick-down switch KD
3——
4——
5 Brake BR
6 ABS switch AB
7 Cruise control set CR
8 Power switch PW
9——
10——
FF KD—— ——BR
AB CR PW—— ——
1
2345
678910
P: MODE FA0
—SWITCH 1 (SW1)—
Reference values

Lights up when the fuse is installed in FWD switch (No. 1).

Light up when the brake pedal is depressed (No. 5).

Light up when the ABS signal is entered (No. 6).

Lights up when the cruise control is set (No. 7).
NOTE:
LED Nos. 2 and 8 do not come on.
DISPLAY
LED No. Signal name Symbol
1 N/P range switch NP
2 R range switch RR
3 D range switch RD
4 3 range switch R3
5 2 range switch R2
6 1 range switch R1
7 Diagnosis switch SS
8——
9——
10——
NP RR RD R3 R2
R1 SS—— —— ——
1
2345
678910
Q: MODE FA1
—SWITCH 2 (SW2)—
Reference values

Lights up when the N or P range is selected (No. 1).

Lights up when the R range is selected (No. 2).

Lights up when the D range is selected (No. 3).

Lights up when the 3 range is selected (No. 4).

Lights up when the 2 range is selected (No. 5).

Lights up when the 1 range is selected (No. 6).

Lights up when the diagnosis switch is connected
(No. 7).
NOTE:
If each LED does not illuminate in the above conditions,
inhibitor switch malfunction may occur. Perform diagnostics
on inhibitor switch.
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3-2AUTOMATIC TRANSMISSION AND DIFFERENTIAL
8. Diagnostic Chart with Select Monitor

9. General Diagnostic Table
Problem parts
Inhibitor switch
Control module
Vehicle speed sensor 1
Vehicle speed sensor 2
Select cable
Select lever
FWD switch
Starter motor and harness
Throttle position sensor
Diagnosis switch
Accumulator (“N”—“D”)
Accumulator (2A)
Accumulator (4A)
Accumulator (3R)
ATF temperature sensor
Strainer
Duty solenoid A
Duty solenoid B
Shift solenoid 1
Shift solenoid 2
Shift solenoid 3
Control valve
Detent spring
Manual plate
Transfer clutch
Transfer valve
Transfer pipe
Duty solenoid C
Forward clutch
Symptom1234567891011121314151617181920212223242526272829
Starter does not rotate when select lever is
in“P”or“N.”; starter rotates when select
lever is“R”,“D”,“3”or“2.”XXXX
Abnormal noise when select lever is in“P”or
“N.”XX
Hissing noise occurs during standing starts. X
Noise occurs while driving in“D
1”range.
Noise occurs while driving in“D
2”range.
Noise occurs while driving in“D
3”range.
Noise occurs while driving in“D
4”range.
Engine stalls while shifting from one range to
another.X
Vehicle moves when select lever is in“N.”X
Shock occurs when select lever is moved
from“N”to“D.”XX X
Excessive time lag occurs when select lever
is moved from“N”to“D.”XX
Shock occurs when select lever is moved
from“N”to“R.”XXX
Excessive time lag occurs when select lever
is moved from“N”to“R.”X
Vehicle does not start in any shift range
(engine revving up).XX
Vehicle does not start in any shift range
(engine stall).
Vehicle does not start in“R”range only
(engine revving up).XX X
Vehicle does not start in“R”range only
(engine stall).X
Vehicle does not start in“D”or“3”range
(engine revving up).X
Vehicle does not start in“D”,“3”or“2”range
(engine revving up).X
Vehicle does not start in“D”,“3”or“2”range
(engine stall).
Vehicle starts in“R”range only (engine rev-
ving up).X
Acceleration during standing starts is poor
(high stall rpm).XX
Acceleration during standing starts is poor
(low stall rpm).
Acceleration is poor when select lever is in
“D”,“3”or“2”range (normal stall rpm).XX
Acceleration is poor when select lever is in
“R”(normal stall rpm).X
No shift occurs from 1st to 2nd gear. X X X X X X X
No shift occurs from 2nd to 3rd gear. XX
No shift occurs from 3rd to 4th gear. X X X X X
No“kick-down”shifts occur. X X
Engine brake is not effected when select
lever is in“3”range.XX X X
1234567891011121314151617181920212223242526272829
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3-2AUTOMATIC TRANSMISSION AND DIFFERENTIAL
9. General Diagnostic Table

Overrunning clutch
Drive pinion
Crown gear
Axle shaft
Differential gear
Final gear
Seal pipe
Oil pump
High clutch
Band brake
Low & reverse clutch
Reverse clutch
One-way clutch (1-2)
One-way clutch (3-4)
Double oil seal
Input shaft
Output shaft
Planetary gear
Reduction gear
Drive plate
Torque converter one-way clutch
Lock-up facing
Lock-up damper
ATF deterioration
ATF level too high or too low
Differential gear oil level too high or too low
Engine performance
Engine speed signal
Parking brake mechanism
Problem parts
30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 Symptom
Starter does not rotate when select lever is
in“P”or“N.”; starter rotates when select
lever is“R”,“D”,“3”or“2.”
XXXAbnormal noise when select lever is in“P”or
“N.”
X Hissing noise occurs during standing starts.
X X X X Noise occurs while driving in“D
1”range.
X X X X Noise occurs while driving in“D
2”range.
X X X Noise occurs while driving in“D
3”range.
X X X X Noise occurs while driving in“D
4”range.
XXEngine stalls while shifting from one range to
another.
Vehicle moves when select lever is in“N.”
XShock occurs when select lever is moved
from“N”to“D.”
Excessive time lag occurs when select lever
is moved from“N”to“D.”
XShock occurs when select lever is moved
from“N”to“R.”
XXExcessive time lag occurs when select lever
is moved from“N”to“R.”
XXXX X XXX X XVehicle does not start in any shift range
(engine revving up).
XVehicle does not start in any shift range
(engine stall).
XXVehicle does not start in“R”range only
(engine revving up).
XXVehicle does not start in“R”range only
(engine stall).
XVehicle does not start in“D”or“3”range
(engine revving up).
Vehicle does not start in“D”,“3”or“2”range
(engine revving up).
XVehicle does not start in“D”,“3”or“2”range
(engine stall).
Vehicle starts in“R”range only (engine rev-
ving up).
XXAcceleration during standing starts is poor
(high stall rpm).
XXXAcceleration during standing starts is poor
(low stall rpm).
XX XAcceleration is poor when select lever is in
“D”,“3”or“2”range (normal stall rpm).
XXXXAcceleration is poor when select lever is in
“R”(normal stall rpm).
XNo shift occurs from 1st to 2nd gear.
X X No shift occurs from 2nd to 3rd gear.
XNo shift occurs from 3rd to 4th gear.
No“kick-down”shifts occur.
Engine brake is not effected when select
lever is in“3”range.
30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58
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3-2AUTOMATIC TRANSMISSION AND DIFFERENTIAL
9. General Diagnostic Table