sensor SUBARU LEGACY 1996 Service Repair Manual

8. Diagnostic Chart with Select Monitor
A: BASIC DIAGNOSTIC CHART
If no trouble codes appear in the on-board diagnostic
operation (although problems have occurred or are
occurring), measure performance characteristics of
sensors, actuators, etc., in the“F”mode (select monitor
function), and compare with the“basic data”to determine
the cause of problems.
Trouble occurs.
No trouble codes appear in on-board diagnostic operation.
Measure each item in select mode function.
Compare measured values with basic data.
Determine item which is outside basic data specifications.
Check sensor and actuator affected.





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8. Diagnostic Chart with Select Monitor

B: LIST OF OUTPUT MODES
1. FUNCTION MODE
Mode Contents Abbr. Unit Contents of display Page
F00 Mode display——AT or EGI mode (when monitor is connected.) 56
F01 Battery voltage VB V Battery voltage applied to control unit. 56
F02 Vehicle speed sensor 1 VSP1 m/h Vehicle speed (miles/h) sent from vehicle speed sensor 1. 57
F03 Vehicle speed sensor 1 VSP1 km/h Vehicle speed (km/h) sent from vehicle speed sensor 1. 57
F04 Vehicle speed sensor 2 VSP2 m/h Vehicle speed (miles/h) sent from vehicle speed sensor 2. 57
F05 Vehicle speed sensor 2 VSP2 km/h Vehicle speed (km/h) sent from vehicle speed sensor 2. 57
F06 Engine speed EREV rpm Engine speed sent from ECM. 58
F07 ATF temperature sensor ATFT°F ATF temperature (°F) sent from ATF temperature sensor. 58
F08 ATF temperature sensor ATFT°C ATF temperature (°C) sent from ATF temperature sensor. 58
F09 Throttle position sensor THV V Voltage sent from throttle position sensor. 59
F10 Gear position GEAR—Transmission gear position 59
F11 Line pressure duty PLDTY % Duty ratio flowing through duty solenoid A. 60
F12 Lock-up duty LUDTY % Duty ratio flowing through duty solenoid B. 61
F13 AWD duty 4WDTY % Duty ratio flowing through duty solenoid C. 62
F14Throttle position sensor
power supplyTHVCC V Power supply voltage to throttle position sensor 63
F15 Mass air flow signal AFM V Output voltage from air flow sensor 63
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8. Diagnostic Chart with Select Monitor

G3M0725
E: MODE F02
—VEHICLE SPEED SENSOR 1 (VSP1)—
F03 = vehicle speed (VSP1):
to be indicated in“km/h”.
CONDITION:
Raise vehicle off ground and operate at constant speed.
SPECIFIED DATA:
Compare speedometer with monitor indications.
Probable cause (if outside“specified data”)
1. Vehicle speed sensor 1
Check performance characteristics of vehicle speed
sensor 1.
OK
Check TCM and replace if necessary.
G3M0726
F: MODE F04
—VEHICLE SPEED SENSOR 2 (VSP2)—
F05 = vehicle speed (VSP2):
to be indicated in“km/h”.
CONDITION:
Raise vehicle off ground and operate at constant speed.
SPECIFIED DATA:
Compare speedometer with monitor indications.
Probable cause (if outside“specified data”)
1. Vehicle speed sensor 2
Check performance characteristics of vehicle speed
sensor 2.
OK
Check TCM and replace if necessary.


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8. Diagnostic Chart with Select Monitor

G3M0727
G: MODE F06—ENGINE SPEED (EREV)—
CONDITION:
Measure with engine operating at constant speed.
SPECIFIED DATA:
Same as tachometer reading (in combination meter)
Probable cause (if outside“specified data”)
1. Conduct diagnostics in relation to MPFI
system for engine speed.
OK
Check TCM and replace if necessary.
OBD0386
H: MODE F07
—ATF TEMPERATURE SENSOR (ATFT)—
F08 = ATF temperature (ATFT):
to be indicated in“deg C”.
CONDITION:

Low ATF temperature (before engine/vehicle starts.)

High ATF temperature (after driving vehicle for warm-
up.)
SPECIFIED DATA:

Ambient temperature: ±50°F (±10°C)
(Low ATF temperature)

ATF temperature: 158—230°F (70—11 0°C)
(High ATF temperature)

Open harness: 176 deg F (80 deg C)

Shorted harness: 320 deg F (160 deg C)
Probable cause (if outside“specified data”)
1. ATF temperature sensor
Check performance characteristics of ATF
temperature sensor.
OK
Check TCM and replace if necessary.

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8. Diagnostic Chart with Select Monitor

B3M0383
I: MODE F09
—THROTTLE POSITION SENSOR (THV)—
CONDITION:

Ignition switch ON (with engine OFF)

Measure voltage while operating throttle valve from a
fully closed position to a fully open position.
SPECIFIED DATA:

Fully closed position: 0.5±0.2 V

Fully open position: 4.6±0.3 V

From fully closed to fully open position:
Voltage must smoothly decrease.

Open harness: 5.0±0.3 V

Shorted harness: 0.00 V
Probable cause (if outside“specified data”)
1. Throttle position sensor
Check performance characteristics of throttle
position sensor.
OK
Check TCM and replace if necessary.
G3M0730
J: MODE F10—GEAR POSITION (GEAR)—
CONDITION:
Check while driving vehicle (after warm-up).
SPECIFIED DATA:
Gear position (Refer to shift performance characteristics
chart.)
Probable cause (item outside“specified data”)
1. Shift solenoid 1
Check performance characteristics of shift solenoid
1.
OK
2. Shift solenoid 2
Check performance characteristics of shift solenoid
2.
OK
3. Shift solenoid 3
Check performance characteristics of shift solenoid
3.
OK
Check TCM and replace as necessary.




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8. Diagnostic Chart with Select Monitor

G3M0731
K: MODE F11
—LINE PRESSURE DUTY (PLDTY)—
CONDITION:

After sufficient warm-up

Ignition ON (engine OFF)

N range
SPECIFIED DATA:

Throttle fully closed: 100%

Throttle fully open : 15% or less
Probable cause (if outside“specified data”)
1. Throttle position sensor
Check in F09 mode.
OK
2. Vehicle speed sensor 1
Check in F02 mode.
OK
3. Vehicle speed sensor 2
Check in F04 mode.
OK
4. Engine speed
Check in F06 mode.
OK
5. ATF temperature sensor
Check in F07 mode.
OK
6. Inhibitor switch
Check for operation.
OK
Check TCM and replace if necessary.






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8. Diagnostic Chart with Select Monitor

G3M0732
L: MODE F12—LOCK-UP DUTY (LUDTY)—
CONDITION:

Idling (after sufficient warm-up) with lock-up system
released.

Driving at 75 km/h (47 MPH) (after sufficient warm-up)
with lock-up system applied.
SPECIFIED DATA:

Lock-up system released: 5%

Lock-up system applied: 95%
Probable cause (if outside“specified data”)
1. Throttle position sensor
Check in F09 mode.
OK
2. Vehicle speed sensor 1
Check in F02 mode.
OK
3. Vehicle speed sensor 2
Check in F04 mode.
OK
4. Engine speed
Check in F06 mode.
OK
5. Inhibitor switch
Check for operation.
OK
Check TCM and replace if necessary.





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8. Diagnostic Chart with Select Monitor

G3M0733
M: MODE F13—AWD DUTY (4WDTY)—
CONDITION:

After sufficient warm-up

Ignition switch ON (engine OFF)

FWD mode

AWD mode, D range, full throttle
SPECIFIED DATA:

95% (FWD mode)

25%, max. (vehicle speed 0 m/h) (AWD mode)
Probable cause (if outside“specified data”)
1. Throttle position sensor
Check in F09 mode.
OK
2. Vehicle speed sensor 1
Check in F02 mode.
OK
3. Vehicle speed sensor 2
Check in F04 mode.
OK
4. ATF temperature sensor
Check in F07 mode.
OK
5. Inhibitor switch
Check for operation.
OK
6. ABS signal
Check ABS system for operation.
OK
Check TCM and replace if necessary.






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8. Diagnostic Chart with Select Monitor

B3M0259
N: MODE F14
—THROTTLE POSITION SENSOR POWER
SUPPLY (THVCC)—
CONDITION:
Ignition switch ON (engine OFF)
SPECIFIED DATA:
5.12±0.1 V
Probable cause (Item outside“specified data”)
1. Throttle position sensor power supply
Check throttle sensor line.
OK
Check TCM and replace if necessary.
B3M0370
O: MODE F15
—MASS AIR FLOW SIGNAL (AFM)—
CONDITION:

Ignition switch ON (engine ON)

N range

Idling
SPECIFIED DATA:
Engine warm-up: 0.5—1.22 V
Probable cause (if outside“specified data”)
1. Mass air flow signal
Check performance characteristics of mass air flow
signal.
OK
Check TCM and replace if necessary.


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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
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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.”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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9. General Diagnostic Table