brake sensor SUBARU LEGACY 1995 Service Owner's Manual

OBD0591
AN: DTC P0705
—TRANSMISSION RANGE SENSOR CIRCUIT
MALFUNCTION (RNG)—
OBD0592A
DESCRIPTION:

The inhibitor switch assures safety when starting the
engine. This switch is mounted on the right side of the
transmission case, and is operated by the range selector
lever.

When the selector lever is set to“P”or“N”, the electri-
cal circuit is connected in the inhibitor switch and the starter
circuit is energized for cracking the engine.

When the selector lever is set to“R”,“D”,“3”,“2”,or“1”
range, the electrical circuit is disconnected in the inhibitor
switch. Hence engine cranking is disabled. In the“R”
range, the back-up light circuit is completed in the switch,
and the back-up lights come on.
DTC DETECTING CONDITION:

Two consecutive trips with fault
TROUBLE SYMPTOM:

Starter does not rotate when selector lever is in“P”or
“N”range.

Starter rotates when selector lever is in“R”,“D”,“3”,“2”
or“1”range.

Engine brake is not effected when selector lever is in“3”
range.

Shift characteristics are erroneous.
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostics Chart with Trouble Code

DTC DETECTING CONDITION:

Two consecutive trips with fault
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 any other DTC (besides DTC P0731,
P0732, P0733, P0734) on display.
2.Check throttle position sensor circuit. “3-2 [T7L0]”.>
3.Check vehicle speed sensor 1 circuit. “3-2 [T7M0]”.>
4.Check vehicle speed sensor 2 circuit. “3-2 [T7N0]”.>
5.Check engine speed input circuit. [T7I0]”.>
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES. [T3D0] and [T3E0].>




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2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostics Chart with Trouble Code

1.Check any other DTC (besides DTC P0740) on
display.
2.Check duty solenoid B circuit. [T7B0]”.>
3.Check throttle position sensor circuit. “3-2 [T7L0]”.>
4.Check vehicle speed sensor 1 circuit. “3-2 [T7M0]”.>
5.Check vehicle speed sensor 2 circuit. “3-2 [T7N0]”.>
6.Check engine speed input circuit. [T7I0]”.>
7.Check inhibitor switch circuit. DTC P0705 [T11AN0]”.>
8.Check brake light switch circuit. DTC P0703 [T11AM0]”.>
9.Check ATF temperature sensor circuit. “3-2 [T7G0]”.>
CAUTION:
After repair or replacement of faulty parts, conduct
CLEAR MEMORY and INSPECTION MODES. [T3D0] and [T3E0].>








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2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostics Chart with Trouble Code

7
CHECK INHIBITOR SWITCH CIRCUIT.
: Is there any trouble in inhibitor switch cir-
cuit?
: Repair or replace inhibitor switch circuit.
: Go to step 8.
8
CHECK BRAKE LIGHT SWITCH CIRCUIT.
: Is there any trouble in brake light switch cir-
cuit?
: Repair or replace brake light switch circuit.
: Go to step 9.
9CHECK ATF TEMPERATURE SENSOR CIR-
CUIT.
: Is there any trouble in ATF temperature sen-
sor circuit?
: Repair or replace ATF temperature sensor circuit.
: Go to next.
: Is there poor contact in TCM connector?
: Repair poor contact in TCM connector.
: Go to next.
: Is there any mechanical trouble in automatic
transmission?
: Repair or replace automatic transmission.
: Replace TCM with a new one.
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostics Chart with Trouble Code

OBD0501
BK: DTC P1700
—THROTTLE POSITION SENSOR CIRCUIT
MALFUNCTION FOR AUTOMATIC
TRANSMISSION (ATTH)—
DESCRIPTION:

The throttle position sensor provides electrical signals
corresponding to the throttle opening. The throttle opening
and accelerator depression speed are detected by this
throttle position sensor output.

Detects throttle opening and determines shift point, line
pressure and lockup vehicle speed according to engine
load.
SOR CIRCUIT MALFUNCTION—[T11G0]”.>
DTC DETECTING CONDITION:

Two consecutive trips with fault
TROUBLE SYMPTOM:

Shift point too high or too low; engine brake not effected
in“3”range; excessive shift shock; excessive tight corner
“braking”
341
2-7ON-BOARD DIAGNOSTICS II SYSTEM
11. Diagnostics Chart with Trouble Code

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
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3-2AUTOMATIC TRANSMISSION AND DIFFERENTIAL
4. Schematic

L: 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.
OBD0502




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

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
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3-2AUTOMATIC TRANSMISSION AND DIFFERENTIAL
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
Engine brake is not effected when select
lever is in“3”or“2”range.
Engine brake is not effected when select
lever is in“1”range.X
Shift characteristics are erroneous.XXXX X X
No lock-up occurs. X X X X
Vehicle cannot be set in“D”range power
mode.XX
“D”range power mode cannot be released. X X X
Parking brake is not effected. X X
Shift lever cannot be moved or is hard to
move from“P”range.XX
Select lever is hard to move. X X X X
Select lever is too light to move (unreason-
able resistance).XX
ATF spurts out.
Differential oil spurts out.
Differential oil level changes excessively.
Odor is produced from oil supply pipe.XX
Shock occurs when select lever is moved
from“1”to“2”range.X XXXX X
Slippage occurs when select lever is moved
from“1”to“2”range.X XXXX X
Shock occurs when select lever is moved
from“2”to“3”range.XXXXXX
Slippage occurs when select lever is moved
from“2”to“3”range.XXXXXX
Shock occurs when select lever is moved
from“3”to“4”range.X X XXX X
Slippage occurs when select lever is moved
from“3”to“4”range.X X XXX X
Shock occurs when select lever is moved
from“3”to“2”range.XXXXX
Shock occurs when select lever is moved
from“D”to“1”range.XXXXX
Shock occurs when select lever is moved
from“2”to“1”range.XXXXX
Shock occurs when accelerator pedal is
released at medium speeds.XXXXX
Vibration occurs during straight-forward
operation.XX
Select lever slips out of position during
acceleration or while driving on rough terrain.XX XX
Vibration occurs during turns (tight corner
“braking”phenomenon).XXX X X XX X
Front wheel slippage occurs during standing
starts.X X X X X X XXXX
Vehicle is not set in FWD mode. X XXX X
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3-2AUTOMATIC TRANSMISSION AND DIFFERENTIAL
9. General Diagnostic Table

1. Supplemental Restraint System
“Airbag”
Airbag system wiring harness is routed near the A.B.S.
control module, A.B.S. sensor and hydraulic control unit.
CAUTION:

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 servicing the A.B.S. control module, A.B.S.
sensor and hydraulic control unit.
2. Pre-inspection
Before performing diagnostics, check the following items
which might affect A.B.S. problems:
1. POWER SUPPLY
1) Measure battery voltage and specific gravity of electro-
lyte.
Standard voltage: 12 V, or more
Specific gravity: Above 1.260
2) Check the condition of the main and other fuses, and
harnesses and connectors. Also check for proper ground-
ing.
2. BRAKE FLUID
1) Check brake fluid level.
2) Check brake fluid leakage.
3. BRAKE DRAG
Check brake drag.
4. BRAKE PAD AND ROTOR
Check brake pad and rotor.
5. TIRE SPECIFICATIONS, TIRE WEAR AND AIR
PRESSURE
Check tire specifications, tire wear and air pressure. to 4-2 [S1A0].>
2
4-4aBRAKES
1. Supplemental Restraint System“Airbag”- 2. Pre-inspection