1996 SUBARU LEGACY Fuel system

OBD0003C
1Fuel level sensor

2Fuel temperature sensor
3Fuel tank pressure sensor

4Fuel sub level sensor
B2M0921AB2M0922A
B2M0946A
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
2. Electrical Components Location

OBD0003B
1Inhibitor switch (AT vehicles only)

2Fuel pump

3Main relay

4Fuel pump relay

5Radiator main fan relay 1 (With A/C models only)
6Radiator main fan relay 2 (With A/C models only)

7Radiator sub fan relay 1 (With A/C models)
Main fan relay (Without A/C models)

8Radiator sub fan relay 2 (With A/C models only)

9Starter
OBD0047AB2M0216A
B2M0218BOBD0034A
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
2. Electrical Components Location

3. CURRENT POWERTRAIN DIAGNOSTIC DATA
(MODE $01)
Refers to data denoting the current operating condition of
analog input/output, digital input/output and/or the power-
train system.
A list of the support data and PID (Parameter Identification)
codes are shown in the following table.
PID DataUnit of measure
01 Number of emission-related powertrain trouble codes and MIL status ON/OFF
03 Fuel system control status—
04 Calculated engine load value%
05 Engine coolant temperature°C
06 Short term fuel trim%
07 Long term fuel trim%
0B Intake manifold absolute pressurekPa
0C Engine revolutionrpm
0D Vehicle speedkm/h
0E Ignition timing advance°
10 Air flow rate from mass air flow sensor g/sec
11 Throttle valve opening angle%
13 Check whether oxygen sensor is installed.—
14 Oxygen sensor output voltage and short term fuel trim associated with oxygen sensor—bank 1 V and %
15 Oxygen sensor output voltage and short term fuel trim associated with oxygen sensor—bank 2 V and %
1C On-board diagnosis system—
NOTE:
Refer to OBD-II general scan tool manufacturer’s instruc-
tion manual to access generic OBD-II PIDs (MODE $01).
4. POWERTRAIN FREEZE FRAME DATA (MODE $02)
Refers to data denoting the operating condition when
trouble is sensed by the on-board diagnosis system.
A list of the support data and PID (Parameter Identification)
codes are shown in the following table.
PID DataUnit of measure
02 Trouble code that caused CARB required freeze frame data storage—
03 Fuel system control status—
04 Calculated engine load value%
05 Engine coolant temperature°C
06 Short term fuel trim%
07 Long term fuel trim%
0B Intake manifold absolute pressurekPa
0C Engine revolutionrpm
0D Vehicle speedkm/h
NOTE:
Refer to OBD-II general scan tool manufacturer’s instruc-
tion manual to access freeze frame data (MODE $02).
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
3. Diagnosis System

6. READ DATA FUNCTION KEY LIST FOR ENGINE
Function mode Contents Abbreviation Unit of measure
F00 ROM ID number YEAR—
F01 Battery voltage VB V
F02 Vehicle speed signal VSP km/h, MPH
F03 Engine speed signal EREV rpm
F04 Engine coolant temperature signal TW°C,°F
F05 Ignition signal ADVS deg
F06 Mass air flow signal QA g/s, V
F07 Throttle position signal THV %, V
F08 Injector pulse width TIM mS
F09 Idle air control signal ISC %
F10 Load data LOAD %
F11 Front oxygen sensor output signal O2 V
F12 Front oxygen sensor maximum and minimum output signal O2max - min V, V
F13 Rear oxygen sensor output signal RO2 V
F14 Rear oxygen sensor maximum and minimum output signal RO2max - min V, V
F17 Short term fuel trim ALPHA %
F19 Knock sensor signal KNOCK deg
F20 Atmospheric absolute pressure signal BARO. P kPa, mmHg
F21 Intake manifold absolute pressure signal MANI. P kPa, mmHg
F29 A/F correction (short term trim) by rear oxygen sensor PHOS %
F30 Long term fuel trim KBLRC %
F31 Long term whole fuel trim K0 %
F32 Front oxygen sensor heater current FO2H A
F33 Rear oxygen sensor heater current RO2H A
F35 Purge control solenoid valve duty ratio CPCD %
F36Maximum value of cylinder #1 misfire times during 100 rota-
tionsMF1 %
F37Maximum value of cylinder #2 misfire times during 100 rota-
tionsMF2 %
F38Maximum value of cylinder #3 misfire times during 100 rota-
tionsMF3 %
F39Maximum value of cylinder #4 misfire times during 100 rota-
tionsMF4 %
F42Maximum and minimum EGR system pressure value (AT
vehicles only)EGRmax - min kPa
F43 Fuel tank pressure signal TNKP kPa, mmHg
F44 Fuel temperature signal TNKT°C,°F
F45 Fuel level signal FLEVEL V
FA 0 O N)OFF signal——
FA 1 O N)OFF signal——
FA 2 O N)OFF signal——
FA 3 O N)OFF signal——
FA 4 O N)OFF signal——
FA 5 O N)OFF signal——
FB0 Diagnostic trouble code (DTC) INSPECT—
FB1 Diagnostic trouble code (DTC) OBD—
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
3. Diagnosis System

Function mode Contents Abbreviation Unit of measure
FB2Load data (Freeze frame data) LOADF %
Engine coolant temperature signal (Freeze frame data) TWF °C
Throttle position signal (Freeze frame data) ALPHF %
Long term fuel trim (Freeze frame data) KBLRF %
Intake manifold absolute pressure signal (Freeze frame data) MANIF kPa
Engine speed signal (Freeze frame data) EREVF rpm
Vehicle speed signal (Freeze frame data) VSPF km/h
FB3Mass air flow signal (Freeze frame data) QAF (P0100) V
Pressure signal (Freeze frame data) PSF (P0105) V
Pressure signal (Freeze frame data) PRF (P0106) V
Engine coolant temperature signal (Freeze frame data) TWF (P0115) V
Throttle position signal (Freeze frame data) THVF (P0120) V
EGR control solenoid valve signal (Freeze frame data) EGR (P0403) —*1
Purge control solenoid valve signal (Freeze frame data) CPC (P0443) —*1
Start switch signal (Freeze frame data) STSW (P1100) —*1
Pressure sources switching solenoid valve signal (Freeze
frame data)BR1 (P1102) —*1
Radiator fan relay 1 signal (Freeze frame data) FAN1 (P1500) —*1
FC0 Clear memory — —
FD01 Compulsory fuel pump relay operation check FUEL PUMP —
FD02 Compulsory purge control solenoid valve operation check CPC SOL —
FD03 Compulsory radiator fan relay operation check RAD FAN —
FD04 Compulsory A/C relay operation check A/C RELAY —
FD05 Compulsory EGR control solenoid valve operation check EGR SOL —
FD07 Compulsory pressure control solenoid valve operation check PCV SOL —
FD08 Compulsory vent control solenoid valve operation check VENT SOL —
FD10Compulsory pressure sources switching solenoid valve opera-
tion checkBR SOL —
NOTE:
1) Subaru select monitor is also available for monitoring
information other than that used for check and repair of the
vehicle.
2) F42 (Maximum and minimum EGR system pressure
value) will not read accurately until the EGR flow diagno-
sis terminates.
EGR flow diagnosis terminates when LED No. 2 illuminates
at function mode FA4.
3) *1: “Hi” or “Low” is shown instead of measured value.
4) Because ASV solenoid valve, FICD solenoid valve and
air injection system diagnosis solenoid valve are not
installed, FD06, FD09 and FD11 will be displayed but non-
functional.
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
3. Diagnosis System

B2M0487
19. FUNCTION MODE: F12
—FRONT OXYGEN SENSOR MAXIMUM AND
MINIMUM OUTPUT SIGNAL (FO2MAX - MIN)—

Front oxygen sensor maximum and minimum output sig-
nals are indicated at the same time.
B2M0488
20. FUNCTION MODE: F13
—REAR OXYGEN SENSOR OUTPUT SIGNAL (RO2)
—
B2M0489
21. FUNCTION MODE: F14
—REAR OXYGEN SENSOR MAXIMUM AND MINIMUM
OUTPUT SIGNAL (RO2MAX - MIN)—

Rear oxygen sensor maximum and minimum output sig-
nals are indicated at the same time.
B2M0490
22. FUNCTION MODE: F17
—SHORT TERM FUEL TRIM [A/F CORRECTION
COEFFICIENT] (ALPHA)—
B2M0491
23. FUNCTION MODE: F19
—KNOCK SENSOR SIGNAL [IGNITION TIMING
CORRECTION COEFFICIENT] (KNOCK)—
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
3. Diagnosis System

B2M0755
24. FUNCTION MODE: F20
—ATMOSPHERIC ABSOLUTE PRESSURE SIGNAL
(BARO. P)—

Atmospheric absolute pressure is indicated in“kPa”and
“mmHg”at the same time.
B2M0756
25. FUNCTION MODE: F21
—INTAKE MANIFOLD ABSOLUTE PRESSURE
SIGNAL (MANI. P)—

Intake manifold absolute pressure is indicated in“kPa”
and“mmHg”at the same time.
B2M0494
26. FUNCTION MODE: F29
—A/F CORRECTION COEFFICIENT [SHORT TERM
TRIM] BY REAR OXYGEN SENSOR (PHOS)—
B2M0495
27. FUNCTION MODE: F30
—LONG TERM FUEL TRIM [A/F LEARNING
CORRECTION COEFFICIENT] (KBLRC)—
B2M0496
28. FUNCTION MODE: F31
—LONG TERM FUEL TRIM WHOLE [A/F LEARNING
CONTROL COEFFICIENT] (K0)—
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2-7ON-BOARD DIAGNOSTICS II SYSTEM
3. Diagnosis System

B2M0501
34. FUNCTION MODE: F38
—MAXIMUM VALUE OF CYLINDER #3 MISFIRE RATE
DURING 100 ROTATIONS (MF3)—
B2M0502
35. FUNCTION MODE: F39
—MAXIMUM VALUE OF CYLINDER #4 MISFIRE RATE
DURING 100 ROTATIONS (MF4)—
B2M0759
36. FUNCTION MODE: F42
—MAXIMUM AND MINIMUM EGR SYSTEM
PRESSURE VALUE [AT VEHICLES] (EGRMAX-MIN)—

Maximum and minimum EGR system pressure value are
indicated at the same time.
H2M1326
37. FUNCTION MODE: F43
—FUEL TANK PRESSURE SIGNAL (TNKP)—
H2M1308
38. FUNCTION MODE: F44
—FUEL TEMPERATURE SIGNAL (TNKT)—
45
2-7ON-BOARD DIAGNOSTICS II SYSTEM
3. Diagnosis System