1997 SUBARU LEGACY automatic transmission

Whine or growl (continuous or
intermittent)
While engine is running with/
without steering turned.Loosened installation of oil pump,
oil pump bracketRetighten.
*8
Abnormal inside of oil pump, hoseReplace oil pump, hose, if the
noise can be heard when running
as well as stand still.
Torque converter growl
air conditioner compression growlRemove power steering pulley
belt and confirm.
Creaking noise (intermittent)
While engine is running with
steering turned.Abnormal inside of gearboxReplace bad parts of gearbox.
Abnormal bearing for steering
shaftApply grease or replace.
*9
Generates when turning steering
wheel with brake (service or park-
ing) applied.If the noise goes off when brake
is released, it is normal.
*10
Vibration
While engine is running with/
without steering turned.
Too low engine speed at startAdjust and instruct customers.
Vane pump aerationFix wrong part.
Vent air.
Damaged valve in oil pump, gear-
boxReplace oil pump, bad parts of
gearbox.
Looseness of play of steering,
suspension partsRetighten.
*8 Oil pump makes whine or growl noise slightly due to its mechanism. Even if the noise can be heard when steering wheel
is turned at stand still there is no abnormal function in the system provided that the noise eliminates when the vehicle is
running.
*9 When stopping with service brake and/or parking brake applied, power steering can be operated easily due to its light
steering effort. If doing so, the disk rotates slightly and makes creaking noise. The noise is generated by creaking between
the disk and pads. If the noise goes off when the brake is released, there is no abnormal function in the system.
*10 There may be a little vibration around the steering devices when turning steering wheel at standstill, even though the com-
ponent parts are properly adjusted and have no defects.
Hydraulic systems are likely to generate this kind of vibration as well as working noise and fluid noise because of com-
bined conditions, i.e., road surface and tire surface, engine speed and turning speed of steering wheel, fluid temperature
and braking condition.
This phenomena does not indicate there is some abnormal function in the system.
The vibration can be known when steering wheel is turned repeatedly at various speeds from slow to rapid step by step
with parking brake applied on concrete road and in“D”range for automatic transmission vehicle.
95
4-3DIAGNOSTICS
1. Power Steering

9. BREAKAGE OF HOSES
Pressure hose burstExcessive holding time of relief
statusInstruct customers.
Malfunction of relief valveReplace oil pump.
Poor cold characteristic of fluidReplace fluid.
Forced out return hosePoor connectionCorrect.
Poor holding of clipRetighten.
Poor cold characteristic of fluidReplace fluid.
Fluid bleeding out of hose slightlyWrong layout, tensionedReplace hose.
Excessive play of engine due to
deterioration of engine mounting
rubberReplace defective parts.
Improper stop position of pitching
stopperReplace defective parts.
*11
Crack on hose
Excessive holding time of relief
statusReplace.
Instruct customer.
Excessive tightening torque for
return hose clipReplace.
Power steering fluid, brake fluid,
engine oil, electrolyte adhere on
the hose surfaceReplace.
Pay attention on service work.
Too many times use in extremely
cold weatherReplace.
Instruct customers.
*11 Although surface layer materials of rubber hoses have excellent weathering resistance, heat resistance and resistance for
low temperature brittleness, they are likely to be damaged chemically by brake fluid, battery electrolyte, engine oil and
automatic transmission fluid and their service lives are to be very shortened. It is very important to keep the hoses free
from before mentioned fluids and to wipe out immediately when the hoses are adhered with the fluids.
Since resistances for heat or low temperature brittleness are gradually declining according to time accumulation of hot or
cold conditions for the hoses and their service lives are shortening accordingly, it is necessary to perform careful inspec-
tion frequently when the vehicle is used in hot weather areas, cold weather area and/or a driving condition in which many
steering operations are required in short time. Particularly continuous work of relief valve over 5 seconds causes to reduce
service lives of the hoses, the oil pump, the fluid, etc. due to over heat.
So, avoid to keep this kind of condition when servicing as well as driving.
98
4-3DIAGNOSTICS
1. Power Steering

Model Sedan Wagon
Engine (cc) 2200
Driving system FWD AWD FWD AWD
L L L POST BRIGHTON L
Hill holder

———

Parking
brakeType Mechanical on rear brakes, drum in disc
Effective drum diameter
mm (in)228.6 (9)
Lining dimensions
(length x width x thickness)
mm (in)218.8 x 35.0 x 4.1 (8.61 x 1.378 x 0.161)
Clearance adjustment Automatic adjustment
Master
cylinderType Tandem
Effective diameter
mm (in)23.81 (15/16)
Reservoir type Sealed type
Brake fluid reservoir capacity
cm
3(cu in)190 (11.59)
Brake
boosterType Vacuum suspended
Effective diameter
mm (in)230 (9.06)
Proportioning
valveSplit point
kPa (kg/cm
2, psi)3,678 (37.5, 533)
Reducing ratio 0.3
Brake line Dual circuit system

: Equipped on manual transmission vehicle.
6
4-4SPECIFICATIONS AND SERVICE DATA
1. Brakes

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).
10
2-7ON-BOARD DIAGNOSTICS II SYSTEM
1. General

B2M0648A
7) Use engine grounding terminal or engine proper as the
grounding point to the body when measuring voltage and
resistance in the engine compartment.
OBD0040B
8) Use TCM mounting stud bolts at the body head ground-
ing point when measuring voltage and resistance inside the
passenger compartment.
9) Every MFI-related part is a precision part. Do not drop
them.
10) Observe the following cautions when installing a radio
in MFI equipped models.
CAUTION:

The antenna must be kept as far apart as possible
from the control unit.
(The ECM is located under the steering column, inside
of the instrument panel lower trim panel.)

The antenna feeder must be placed as far apart as
possible from the ECM and MFI harness.

Carefully adjust the antenna for correct matching.

When mounting a large power type radio, pay spe-
cial attention to the three items above mentioned.

Incorrect installation of the radio may affect the
operation of the ECM.
11) Before disconnecting the fuel hose, disconnect the fuel
pump connector and crank the engine for more than five
seconds to release pressure in the fuel system. If engine
starts during this operation, run it until it stops.
12) Problems in the electronic-controlled automatic trans-
mission may be caused by failure of the engine, the elec-
tronic control system, the transmission proper, or by a com-
bination of these. These three causes must be distin-
guished clearly when performing diagnostics.
13) Diagnostics should be conducted by rotating with
simple, easy operations and proceeding to complicated,
difficult operations. The most important thing in diagnostics
is to understand the customer’s complaint, and distinguish
between the three causes.
77
2-7ON-BOARD DIAGNOSTICS II SYSTEM
4. Cautions

6. Basic Diagnostic Procedure
Trouble occurs.
Ask the customer when and how the
trouble occurred using interview
check list.
Start the engine.
Ye sNoInspection using“8. Diagnostics for
Engine Start Failure”. [T800].>
Malfunction indicator lamp (MIL) illu-
minates.
Ye sNoInspection using“9. General Diag-
nostics Table”.
Inspection using Subaru select moni-
tor or OBD-II general scan tool.
(Subaru select monitor: MODE FB1)
Trouble code
No trouble code designated.Repair.
See NOTE: *1
designated.
Inspection using“10. Diagnostics
Chart with Trouble Code for LHD
Vehicles”.
“11. Diagnostics Chart with Trouble
Code for RHD Vehicles”. [T1100].>
See NOTE: *2.
Trouble code
designated.

Repair.
Inspection mode
Inspection using Subaru select moni-
tor or OBD-II general scan tool.
(Subaru select monitor: MODE FB0)
No trouble code
Clear memory mode.
designated.
END
NOTE:

*1: If trouble code is not shown on display although the
MIL illuminates, perform diagnostics of the MIL (CHECK
ENGINE LIGHT) circuit or combination meter. [T700].>

*2: Carry out the basic check, only when trouble code
about automatic transmission is shown on display. 2-7 [T6A0].>






84
2-7ON-BOARD DIAGNOSTICS II SYSTEM
6. Basic Diagnostic Procedure

A: BASIC CHECK ITEMS FOR AT
When trouble code about automatic transmission is shown
on display, carry out the following basic check. After that,
carry out the replacement or repair work.
1) ATF level check
2) Differential gear oil level check
3) ATF leak check
4) Differential gear oil leak check
5) Brake band adjustment
6) Stall test
7) Line pressure test
8) Transfer clutch pressure test
9) Time lag test
10) Road test
11) Shift characteristics
NOTE:
As for the method, refer to 3-2 [W2A0], [W2B1], [W300].
85
2-7ON-BOARD DIAGNOSTICS II SYSTEM
6. Basic Diagnostic Procedure

B: GENERAL DIAGNOSTICS TABLE WITH
NONCONFORMITY SYMPTOM FOR
AUTOMATIC TRANSMISSION
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
Hold 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
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Starter does not rotate when select lever is
in“P”or“N.”; starter rotates when select
lever is“R”,“D”,“3”or“2.”
Abnormal noise when select lever is in“P”or
“N.”
Hissing noise occurs during standing starts.
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.
Vehicle moves when select lever is in“N.”
Shock occurs when select lever is moved
from“N”to“D.” 
Excessive time lag occurs when select lever
is moved from“N”to“D.”
Shock occurs when select lever is moved
from“N”to“R.”
Excessive time lag occurs when select lever
is moved from“N”to“R.”
Vehicle does not start in any shift range
(engine revving up).
Vehicle does not start in any shift range
(engine stall).
Vehicle does not start in“R”range only
(engine revving up). 
Vehicle does not start in“R”range only
(engine stall).
Vehicle does not start in“D”or“3”range
(engine revving up).
Vehicle does not start in“D”,“3”or“2”range
(engine revving up).
Vehicle does not start in“D”,“3”or“2”range
(engine stall).
Vehicle starts in“R”range only (engine rev-
ving up).
Acceleration during standing starts is poor
(high stall rpm).
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).
Acceleration is poor when select lever is in
“R”(normal stall rpm).
No shift occurs from 1st to 2nd gear.   
No shift occurs from 2nd to 3rd gear.
No shift occurs from 3rd to 4th gear.
No“kick-down”shifts occur.
Engine brake is not effected when select
lever is in“3”range.  
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125
2-7ON-BOARD DIAGNOSTICS II SYSTEM
9. General Diagnostic Table