2004 SUBARU FORESTER oxygen

EX(H4DOTC)-11
EXHAUST
Center Exhaust Pipe
4) Install the center exhaust pipe to rear exhaust
pipe.
Tightening torque:
18 N·m (1.8 kgf-m, 13.0 ft-lb)
5) Connect the connector to rear oxygen sensor.
6) Secure the clip on crossmember.
 AT model
 MT model7) Tighten the bolt which holds center exhaust pipe
bracket to transmission.
Tightening torque:
30 N·m (3.1 kgf-m, 22.4 ft-lb)
8) Tighten the bolt which holds center exhaust pipe
to hanger bracket.
Tightening torque:
35 N·m (3.6 kgf-m, 26.0 ft-lb)
9) Tighten the bolts which hold intercooler bracket.
Tightening torque:
35 N·m (3.6 kgf-m, 26.0 ft-lb)
10) Lower the vehicle.
11) Place the turbocharger lower cover, and tighten
the bolts which install upper side of lower cover.
Tightening torque:
7.4 N·m (0.75 kgf-m, 5.4 ft-lb)
EX-00042
FU-00081
FU-01311
FU-01312
EX-00014
EX-00043
EX-00011

EX(H4DOTC)-13
EXHAUST
Joint Pipe
4. Joint Pipe
A: REMOVAL
1) Disconnect the ground cable from battery.
2) Disconnect the exhaust temperature sensor
connector.
3) Remove the front oxygen (A/F) sensor. FU(H4DOTC)-45, REMOVAL, Front Oxygen (A/F)
Sensor.> or MOVAL, Front Oxygen (A/F) Sensor.>
4) Remove the under cover.
5) Remove the exhaust manifold lower cover (RH).6) Remove the nuts which hold front exhaust man-
ifold to joint pipe.
7) Remove the center exhaust pipe. EX(H4DOTC)-9, REMOVAL, Center Exhaust
Pipe.>
8) Remove the turbocharger.
er.>
9) Take off the joint pipe in the upward direction.
B: INSTALLATION
Install in the reverse order of removal.
Tightening torque:
T: 35 N·m (3.6 kgf-m, 26.0 ft-lb)
FU-00009
EX-00044
EX-00003
EX-00018
EX-00019
T

EN(H4DOTC)-13
ENGINE (DIAGNOSTIC)
Electrical Component Location
(1) Front oxygen (A/F) sensor (3) Exhaust gas temperature sensor (5) Rear Oxygen Sensor
(2) Precatalytic converter (4) Front catalytic converter (6) Rear catalytic converter
(1)
(4) (3)
(5)(6)
(2)
EN-00302

EN(H4DOTC)-23
ENGINE (DIAGNOSTIC)
Engine Control Module (ECM) I/O Signal
5. Engine Control Module (ECM) I/O Signal
A: ELECTRICAL SPECIFICATION
DESCRIPTION Connector No. Terminal No.Signal (V)
NOTE
Ignition SW ON
(engine OFF)Engine ON
(Idling)
Crank-
shaft posi-
tion sensorSignal (+) B135 10 0−7 — +7 Waveform
Signal (−) B135 22 0 0 —
Shield B135 31 0 0 —
Camshaft
position
sensorSignal (+) B135 11 0−7 — +7 Waveform
Signal (−) B135 23 0 0 —
Shield B135 31 0 0 —
Throttle
position
sensorSignal B136 18Fully closed: 0.2 — 1.0
Fully opened: 4.2 — 4.7—
Pow er
supplyB136 16 5 5 —
GND
(sensors)B136 35 0 0 —
Rear Oxy-
gen Sen-
sorSignal B137 25 0 0 — 0.9 —
Shield B137 31 0 0 —
GND
(sensors)B136 35 0 0 —
Fr o nt ox y-
gen (A/F)
sensor
heaterSignal 1 B134 3 0 — 1.0 0 — 1.0 Waveform
Signal 2 B134 2 0 — 1.0 0 — 1.0 Waveform
Rear oxygen sensor
heater signalB135 2 0 — 1.0 0 — 1.0 Waveform
Engine
coolant
tempera-
ture sen-
sorSignal B136 14 1.0 — 1.4 1.0 — 1.4 After engine is warmed-up.
GND
(sensors)B136 35 0 0 After engine is warmed-up.
Vehicle speed signal B135 26 0 or 5 0 or 5“5” and “0” are repeatedly dis-
played when vehicle is driven.
EN-02308
B134
34
3330 31 3229 26
27
28 25
1
2
8 9 310
11 12
19 20 21 13 14
15
16 17
18 22 23 24
3330 31 32
29 26
27
28 25
7
8 9 5 64
10
11 12
19 20 21 13 14
15 16
17
18 22
23 241
2 3
7 5 64
3534
B137 B135
B136
33
30 31
32
29 26
27
28 25
8 910
11 12
19
20 21 13 14
15 16 17
18
22
23 241
2
3
75 64
3534
30 3129
26
27
28 25
8 910
11 12
19 20 21 13 14
15 16 17
18 22
23 241 2
3
75 64

EN(H4DOTC)-26
ENGINE (DIAGNOSTIC)
Engine Control Module (ECM) I/O Signal
Front oxygen (A/F) sen-
sor signal (+)B134 33 2.8 — 3.2 2.8 — 3.2 —
Front oxygen (A/F) sen-
sor signal (−)B134 26 2.4 — 2.7 2.4 — 2.7 —
Front oxygen (A/F) sen-
sor shieldB134 25 0 0 —
SSM/GST communica-
tion lineB137 20Less than 1←→
More than 4Less than 1←→
More than 4—
CAN Communication
(+)B137 18 Pulse signal Pulse signal
CAN Communication (−) B137 26 Pulse signal Pulse signal
GND (sensor) B136 35 0 0 —
GND (injector) B137 7 0 0 —
GND (ignition system) B135 12 0 0 —
GND (power supply)B135 1 0 0 —
B135 4 0 0 —
GND (control system)B137 1 0 0 —
B137 2 0 0 —
GND (oxygen sensor
heater 1)B134 7 0 0 —
GND (oxygen sensor
heater 2)B134 6 0 0 — DESCRIPTION Connector No. Terminal No.Signal (V)
NOTE
Ignition SW ON
(engine OFF)Engine ON
(Idling)

EN(H4DOTC)-31
ENGINE (DIAGNOSTIC)
OBD-II General Scan Tool
2. MODE $01 (CURRENT POWERTRAIN DIAGNOSTIC DATA)
Refers to data denoting the current operating condition of analog input/output, digital input/output and/or the
powertrain system.
A list of the support data and PID (Parameter Identification) codes are shown in the following table.
NOTE:
Refer to OBD-II general scan tool manufacturer’s instruction manual to access generic OBD-II PIDs (MODE
$01).
3. MODE $02 (POWERTRAIN FREEZE FRAME DATA)
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.
NOTE:
Refer to OBD-II general scan tool manufacturer’s instruction manual to access freeze frame data (MODE
$02).
PID Data Unit of measure
01Number of emission-related powertrain DTC and malfunction indicator light status Diagnosis
support dataON/OFF
03 Fuel system control status—
04 Calculated engine load value%
05 Engine coolant temperature°C
06 Short term fuel trim%
07 Long term whole fuel trim%
0B Intake manifold absolute pressure kPa, mmHg
0C Engine revolutionrpm
0D Vehicle speedkm/h
0E Ignition timing advance°
0F Intake air temperature°C
10 Air flow rate of manifold absolute pressure sensor g/sec
11 Throttle valve opening angle%
13 Check whether oxygen sensor is installed. —
15Oxygen sensor output voltage and short term fuel trim associated with oxygen sensor — bank
1V and %
1C On-board diagnostic system—
21 MI illuminating process—
24 A/F sensor 1 output voltage and short term fuel trim associated with A/F sensor 1 V and %
34 A/F sensor 1 current and lambda A and —
PID Data Unit of measure
02 DTC 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 whole fuel trim%
0B Intake manifold absolute pressure kPa, mmHg
0C Engine speedrpm
0D Vehicle speedkm/h
0E Ignition timing°
0F Intake air temperature°C
10 Amount of intake airg/s
11 Throttle opening%

EN(H4DOTC)-34
ENGINE (DIAGNOSTIC)
Subaru Select Monitor
4. READ CURRENT DATA FOR ENGINE. (NORMAL MODE)
1) On the «Main Menu» display screen, select the {Each System Check} and press the [YES] key.
2) On the «System Selection Menu» display screen, select the {Engine} and press the [YES] key.
3) Press the [YES] key after the information of engine type was displayed.
4) On the «Engine Diagnosis» screen, select the {Current Data Display/Save}, and then press the [YES] key.
5) On the «Data Display Menu» screen, select the {Data Display} and press the [YES] key.
6) Using the scroll key, move the display screen up or down until the desired data is shown.
 A list of the support data is shown in the following table.
Remarks Display Unit of measure
Battery voltage Battery Voltage V
Vehicle speed signal Vehicle Speed km/h or MPH
Engine speed signal Engine Speed rpm
Engine coolant temperature signal Coolant Temp.°C or °F
Ignition timing signal Ignition Timing deg
Throttle position signal Throttle Opening Angle %
Throttle position signal Throttle Sensor Voltage V
Injection pulse width Fuel Injection #1 Pulse ms
Idle air control signal ISC Valve Duty Ratio %
generated duty control signal ALT Duty %
Fuel pump duty control signal Fuel Pump Duty %
A/F sensor current A/F Sensor #1 Current mA
A/F sensor resistance A/F Sensor #1 ResistanceΩ
Front oxygen (A/F) sensor output signal A/F Sensor #1 —
Rear oxygen sensor output signalRear O
2 Sensor
V
Short term fuel trim A/F Correction #1 %
Knock sensor correction Knocking Correction deg
Atmospheric pressure signal Atmosphere Pressure mmHg, kPa, inHg or psi
Intake manifold relative pressure signal Mani. Relative Pressure mmHg, kPa, inHg or psi
Intake manifold absolute pressure signal Mani. Absolute Pressure mmHg, kPa, inHg or psi
A/F correction (short term fuel trim) by rear oxygen sensor A/F Correction #3 %
Long term whole fuel trim A/F Learning #1 %
Canister purge control solenoid valve duty ratio CPC Valve Duty Ratio %
Primary supercharged pressure control signal Primary Control %
Tumble generated valve position sensor signal (RH side) TGV Position Sensor R V
Tumble generated valve position sensor signal (LH side) TGV Position Sensor L V
Tumble generated valve drive signal TGV Drive OPEN or CLOSE
Fuel level signal Fuel Level Voltage V
Intake air temperature signal Intake Air Temp.°C or °F
Mass air flow sensor signal Mass Air Flow g/s
Mass air flow sensor signal Air Flow Sensor Voltage V
Valve Timing Signal VVT Adv. Ang. amount R deg
Valve Timing Signal VVT Adv. Ang. amount L deg
Oil flow control solenoid valve signal OCV Duty R %
Oil flow control solenoid valve signal OCV Duty L %
Oil flow control solenoid valve current OCV current R mA
Oil flow control solenoid valve current OCV Current L mA
AT/MT identification signal AT Vehicle ID Signal AT or MT
Test Mode Signal Test Mode Signal ON or OFF
Load switch signal Electric Load Signal ON or OFF
Ignition switch signal Ignition Switch ON or OFF
Neutral position switch signal Neutral Position Switch ON or OFF
Air conditioning switch signal A/C Switch ON or OFF

EN(H4DOTC)-35
ENGINE (DIAGNOSTIC)
Subaru Select Monitor
NOTE:
For detailed operation procedure, refer to the “SUBARU SELECT MONITOR OPERATION MANUAL”.
5. READ CURRENT DATA FOR ENGINE (OBD MODE)
1) On the «Main Menu» display screen, select the {Each System Check} and press the [YES] key.
2) On the «System Selection Menu» display screen, select the {Engine} and press the [YES] key.
3) Press the [YES] key after the information of engine type was displayed.
4) On the «Engine Diagnosis» display screen, select the {OBD System} and press the [YES] key.
5) On the «OBD Menu» screen, select the {Current Data Display/Save}, and then press the [YES] key.
6) On the «Data Display Menu» screen, select the {Data Display} and press the [YES] key.
7) Using the scroll key, move the display screen up or down until the desired data is shown.
 A list of the support data is shown in the following table.
Air conditioning signal A/C Compressor Signal ON or OFF
Radiator main fan relay signal Radiator Fan Relay #1 ON or OFF
Knocking signal Knocking Signal ON or OFF
Radiator sub fan relay signal Radiator Fan Relay #2 ON or OFF
Power steering switch signal P/S Switch ON or OFF
Engine torque control permission signal Torque Permission Signal ON or OFF
Rear oxygen sensor rich signal Rear Oxygen Rich Signal ON or OFF
Starter switch signal Starter Switch ON or OFF
Idle switch signal Idle Switch ON or OFF
Crankshaft position sensor signal Crankshaft Position Sig. ON or OFF
Camshaft position sensor signal Camshaft Position Sig. ON or OFF
Rear defogger switch signal Rear Defogger SW ON or OFF
Blower fan switch signal Blower Fan SW ON or OFF
Small light switch signal Light Switch ON or OFF
Tumble generated valve output signal TGV Output ON or OFF
Exhaust temperature signal Exhaust Gas Temperature°C
Estimated cumulative driving distance Odd Meter km
Roughness Monitor for #1 cylinder Roughness Monitor #1 —
Roughness Monitor for #2 cylinder Roughness Monitor #2 —
Roughness Monitor for #3 cylinder Roughness Monitor #3 —
Roughness Monitor for #4 cylinder Roughness Monitor #4 —
Wiper switch signal Wiper Switch ON or OFF
A/C middle pressure switch signal A/C Mid pressure switch ON or OFF
AT retard angle demand signal Retard Signal from AT ON or OFF
AT fuel cut demand signal Fuel Cut Signal from AT ON or OFF
Description Display Unit of measure
Number of diagnosis code Number of Diag. Code —
Condition of malfunction indicator light MI (MIL) ON or OFF
Monitoring test of misfire Misfire monitoring Complete or incomplete
Monitoring test of fuel system Fuel system monitoring Complete or incomplete
Monitoring test of comprehensive component Component monitoring Complete or incomplete
Test of catalyst Catalyst Diagnosis Complete or incomplete
Test of heating-type catalyst Heated catalyst No support
Test of evaporative emission purge control system Evaporative purge system No support
Test of secondary air system Secondary air system No support
Test of air conditioning system refrigerant A/C system refrigerant No support
Test of oxygen sensor Oxygen sensor Complete or incomplete
Test of oxygen sensor heater Oxygen Heater Diagnosis Complete or incomplete
Test of EGR system EGR system No supportRemarks Display Unit of measure