2004 SUBARU FORESTER coolant temperature

EN(H4DOTC)-11
ENGINE (DIAGNOSTIC)
Electrical Component Location
 SENSOR
(1) Manifold absolute pressure sensor (4) Knock sensor (7) Mass air flow and intake air tem-
perature sensor
(2) Engine coolant temperature sen-
sor(5) Camshaft position sensor
(6) Crankshaft position sensor (8) Tumble generator valve position
sensor (3) Throttle position sensor
EN-00293
(1)
(7) (6) (4) (8) (5)(2)
(3)

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)-36
ENGINE (DIAGNOSTIC)
Subaru Select Monitor
NOTE:
For detailed operation procedure, refer to the “SUBARU SELECT MONITOR OPERATION MANUAL”.
6. READ FREEZE FRAME 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» display screen, select the {Freeze Frame Data} and press the [YES] key.
 A list of the support data is shown in the following table.
NOTE:
For detailed operation procedure, refer to the “SUBARU SELECT MONITOR OPERATION MANUAL”.
Air fuel ratio control system for bank 1 Fuel System for Bank 1 —
Engine load data Calculated load value %
Engine coolant temperature signal Coolant Temp.°C or °F
Short term fuel trim by front oxygen (A/F) sensor Short term fuel trim B1 %
Long term fuel trim by front oxygen (A/F) sensor Long term fuel trim B1 %
Intake manifold absolute pressure signal Mani. Absolute Pressure mmHg, kPa, inHg or psi
Engine speed signal Engine Speed rpm
Vehicle speed signal Vehicle Speed km/h or MPH
Ignition timing advance for #1 cylinder Ignition timing adv. #1°
Intake air temperature signal Intake Air Temp.°C or °F
Amount of intake air Mass Air Flow g/s
Throttle position signal Throttle Opening Angle %
Rear oxygen sensor output signal Oxygen Sensor #12 V
Air fuel ratio correction by rear oxygen sensor Short term fuel trim #12 %
On-board diagnostic system OBD System —
Rear oxygen sensor signal Oxygen Sensor #11 —
Rear oxygen sensor signal Oxygen Sensor #12 —
Malfunction indicator light illuminating process Lighted MI Lamp History —
A/F sensor output signal (voltage) A/F sensor #11 V
A/F lambda signal A/F sensor #11 —
A/F sensor lambda signal A/F sensor #11 —
A/F sensor signal (power supply) A/F sensor #11 mA
Description Display Unit of measure
Diagnostic code of freeze frame data Freeze frame data Diagnostic code
Air fuel ratio control system for bank 1 Fuel system for Bank 1 —
Air fuel ratio control system for bank 2 Fuel System for Bank 2 —
Engine load data Calculated Load Valve %
Engine coolant temperature signal Coolant Temp.°C or °F
Short term fuel trim by front oxygen (A/F) sensor Short term fuel trim B1 %
Long term fuel trim by front oxygen (A/F) sensor Long term fuel trim B1 %
Intake manifold absolute pressure signal Mani. Absolute Pressure mmHg, kPa, inHg or psi
Engine speed signal Engine Speed rpm
Vehicle speed signal Vehicle Speed km/h or MPH
Ignition timing advance for #1 cylinder Ignition timing adv. #1°
Intake air temperature signal Intake Air Temp.°C or °F
Amount of intake air Mass Air Flow g/s
Throttle position signal Throttle Opening Angle %Description Display Unit of measure

EN(H4DOTC)-40
ENGINE (DIAGNOSTIC)
Inspection Mode
12.Inspection Mode
A: OPERATION
Perform the diagnosis on the “Diagnosis Trouble Codes (DTC) List” below.
Refer to the item of drive cycle when perform the diagnosis not on the “Diagnosis Trouble Codes (DTC) List”
below.
DTC Item On condition
P0011 A Camshaft Position-Timing Over-Advanced or System Performance (Bank 1) —
P0021 A Camshaft Position-Timing Over-Advanced or System Performance (Bank 2) —
P0031 HO2S Sensor Circuit Low Voltage (Bank 1 Sensor 1) —
P0032 HO2S Sensor Circuit High Voltage (Bank 1 Sensor 1) —
P0037 HO2S Sensor Circuit Low Voltage (Bank 1 Sensor 2) —
P0038 HO2S Sensor Circuit High Voltage (Bank 1 Sensor 2) —
P0102 Mass or Volume Air Flow Circuit Low Input —
P0103 Mass or Volume Air Flow Circuit High Input —
P0107 Manifold Absolute Pressure/Barometric Pressure Circuit Low Input —
P0108 Manifold Absolute Pressure/Barometric Pressure Circuit High Input —
P0112 Intake Air Temperature Circuit Low Input —
P0113 Manifold Absolute Pressure/Barometric Pressure Circuit High Input —
P0117 Engine Coolant Temperature Circuit Low Input —
P0118 Engine Coolant Temperature Circuit High Input —
P0122 Throttle/Pedal Position Sensor/Switch “A” Circuit Low Input —
P0123 Throttle/Pedal Position Sensor/Switch “A” Circuit High Input —
P0129 Barometric Pressure Too Low —
P0130 O
2 Sensor Circuit (Bank 1 Sensor 1) —
P0131 O
2 Sensor Circuit Low Voltage (Bank 1 Sensor 1) —
P0132 O
2 Sensor Circuit High Voltage (Bank 1 Sensor 1) —
P0134 O
2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1) —
P0137 O
2 Sensor Circuit Low Voltage (Bank 1 Sensor 2) —
P0138 O
2 Sensor Circuit High Voltage (Bank 1 Sensor 2) —
P0171 System Too Lean (Bank 1) —
P0172 System Too Rich (Bank 1) —
P0230 Fuel Pump Primary Circuit —
P0245 Turbo/Super Charger Wastegate Solenoid “A” Low —
P0327 Knock Sensor 1 Circuit Low Input (Bank 1 or Single Sensor) —
P0328 Knock Sensor 1 Circuit High Input (Bank 1 or Single Sensor) —
P0335 Crankshaft Position Sensor “A” Circuit —
P0336 Crankshaft Position Sensor “A” Circuit Range/Performance —
P0340 Camshaft Position Sensor “A” Circuit (Bank 1 or Single Sensor) —
P0341Camshaft Position Sensor “A” Circuit Range/Performance (Bank 1 or Single
Sensor)—
P0365 Camshaft Position Sensor “B” Circuit (Bank 1) —
P0390 Camshaft Position Sensor “B” Circuit (Bank 2) —
P0458 Evaporative Emission Control System Purge Control Valve Circuit Low —
P0462 Fuel Level Sensor Circuit Low Input —
P0463 Fuel Level Sensor Circuit High Input —
P0502 Vehicle Speed Sensor Circuit Low Input —
P0503 Vehicle Speed Sensor Intermittent/Erratic/High —
P0509 Idle Control System Circuit High —
P0512 Starter Request Circuit—
P0513 Incorrect Immobilizer Key —
P0519 Idle Control System Malfunction (Fail-Safe) —

EN(H4DOTC)-45
ENGINE (DIAGNOSTIC)
Drive Cycle
13.Drive Cycle
A: OPERATION
There are three driving patterns on diagnosis.Following trouble can be diagnosed with driving specified pat-
terns.After repair the following trouble, be sure to check that the trouble is cleared correctly by the driving
specified patterns.
1. PREPARATION FOR DRIVE CYCLE
1) Check battery voltage is more than 12 V and fuel remains half [20 — 402 (5.3 — 10.6 US gal, 4.4 — 8.8
Imp gal)].
2) After performing the diagnostics and clearing the memory, check for any remaining unresolved trouble da-
ta.
3) Separate the test mode connector.
NOTE:
 Be sure to perform the diagnosis after idling from starting the cooled engine except when the engine cool-
ant temperature is specified.
 Perform the diagnosis twice when the DTC is marked * and after the completion of first diagnosis, stop the
engine and perform the second diagnosis in the same condition.
2. DRIVE THE VEHICLE 20 MINUTES AT THE SPEED OF 80 KM/H (50 MPH), AND THEN IDLE
THE ENGINE 1 MINUTE.
3. 10 MINUTES IDLING
NOTE:
Drive the vehicle more than 10 km/h (6 MPH) before diagnosis.
DTC Item On condition
*P0125 Insufficient Coolant Temperature For Closed Loop Fuel ControlEngine coolant temperature at
start is less than 20°C (68°F)
*P0133O
2 Sensor Circuit Slow Response (Bank 1 Sensor 1)
—
*P0420 Catalyst System Efficiency Below Threshold (Bank 1) —
P0459 Evaporative Emission Control System Purge Control Valve Circuit High —
P0461 Fuel Level Sensor Circuit Range/Performance —
P0546 Exhaust Gas Temperature Sensor Circuit High - Bank 1 —
P1312 Exhaust Gas Temperature Sensor MalfunctionEngine coolant temperature at
start is less than 30°C (86°F)
DTC Item On condition
P0111 Intake Air Temperature Circuit Range/Performance —
P0464 Fuel Level Sensor Circuit Intermittent —
P0508 Idle Control System Circuit Low —
*P0483 Cooling Fan Rationality Check —
*P0506 Idle Control System RPM Lower Than Expected —
*P0507 Idle Control System RPM Higher Than Expected —

EN(H4DOTC)-46
ENGINE (DIAGNOSTIC)
Drive Cycle
4. DRIVE THE VEHICLE WITH FOLLOWING DRIVE PATTERNS
(A) Run the engine at idle for more
than 10 seconds.(D) Slowdown the vehicle to 64 km/h
(40 MPH) with throttle fully closed
condition.(F) Accelerate the vehicle to 97 km/h
(60 MPH) within 10 seconds.
(B) Accelerate the vehicle to 97 km/h
(60 MPH) within 20 seconds.(G) Stop the vehicle with throttle fully
closed condition. (E) Drive the vehicle at 64 km/h (40
MPH) for 20 seconds.
(C) Drive the vehicle at 97 km/h (60
MPH) for 20 seconds.(H) Vehicle speed km/h (MPH)
(I) (Sec.)
DTC Item On condition
P0030 HO2S Heater Control Circuit (Bank 1 Sensor 1) —
P0068 Manifold Pressure Sensor Range/Performance —
P0246 Turbo/Super Charger Wastegate Solenoid “A” High —
P1090 Tumble Generated Valve System 1 (Valve Open)Engine coolant temperature at
start is −5 — 5°C (−41 — 41°F)
P1092 Tumble Generated Valve System 2 (Valve Open)Engine coolant temperature at
start is −5 — 5°C (−41 — 41°F)
*P0121 Throttle/Pedal Position Sensor/Switch “A” Circuit Range/Performance —
*P0139O
2 Sensor Circuit Slow Response (Bank 1 Sensor 2)
—
*P0301 Cylinder 1 Misfire DetectedDiagnosis may be completed at
once
*P0302 Cylinder 2 Misfire DetectedDiagnosis may be completed at
once
*P0303 Cylinder 3 Misfire DetectedDiagnosis may be completed at
once
*P0304 Cylinder 4 Misfire DetectedDiagnosis may be completed at
once
*P0101 Mass or Volume Air Flow Circuit Range/Performance —
P0244 Turbo/Super Charger Wastegate Solenoid “A” Range/Performance —
P1301 Misfire Detected (High Temperature Exhaust Gas) —
EN-00842
(C) (H)
(I) (60)
97
64(40)
(B)
(A)(F) (D)
(E)
150 100 50 0(G)

EN(H4DOTC)-74
ENGINE (DIAGNOSTIC)
List of Diagnostic Trouble Code (DTC)
18.List of Diagnostic Trouble Code (DTC)
A: LIST
DTC Item NOTE
P0011 A Camshaft Position-Timing Over-
Advanced or System Performance
(Bank 1) OVER - ADVANCED OR SYSTEM PERFORMANCE (BANK 1), Diagnostic
Procedure with Diagnostic Trouble Code (DTC).>
P0021 A Camshaft Position-Timing Over-
Advanced or System Performance
(Bank 2) OVER - ADVANCED OR SYSTEM PERFORMANCE (BANK 2), Diagnostic
Procedure with Diagnostic Trouble Code (DTC).>
P0030 HO2S Heater Control Circuit (Bank
1 Sensor 1) LOW (BANK 1 SENSOR 1), Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
P0031 HO2S Sensor Circuit Low Voltage
(Bank 1 Sensor 1) LOW (BANK 1 SENSOR 1), Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
P0032 HO2S Sensor Circuit High Voltage
(Bank 1 Sensor 1) HIGH (BANK 1 SENSOR 1), Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
P0037 HO2S Sensor Circuit Low Voltage
(Bank 1 Sensor 2) LOW (BANK 1 SENSOR 2), Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
P0038 HO2S Sensor Circuit High Voltage
(Bank 1 Sensor 2) HIGH (BANK 1 SENSOR 2), Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
P0068 Manifold Pressure Sensor Range/
Performance RANGE/PERFORMANCE, Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
P0101 Mass or Volume Air Flow Circuit
Range/Performance CUIT RANGE/PERFORMANCE, Diagnostic Procedure with Diagnostic Trou-
ble Code (DTC).>
P0102 Mass or Volume Air Flow Circuit
Low Input CUIT LOW INPUT, Diagnostic Procedure with Diagnostic Trouble Code
(DTC).>
P0103 Mass or Volume Air Flow Circuit
High Input CIRCUIT HIGH INPUT, Diagnostic Procedure with Diagnostic Trouble Code
(DTC).>
P0107 Manifold Absolute Pressure/Baro-
metric Pressure Circuit Low Input SURE/BAROMETRIC PRESSURE CIRCUIT LOW INPUT, Diagnostic Pro-
cedure with Diagnostic Trouble Code (DTC).>
P0108 Manifold Absolute Pressure/Baro-
metric Pressure Circuit High Input CIRCUIT HIGH INPUT, Diagnostic Procedure with Diagnostic Trouble Code
(DTC).>
P0111 Intake Air Temperature Circuit
Range/Performance CUIT RANGE/PERFORMANCE, Diagnostic Procedure with Diagnostic Trou-
ble Code (DTC).>
P0112 Intake Air Temperature Circuit Low
Input CUIT LOW INPUT, Diagnostic Procedure with Diagnostic Trouble Code
(DTC).>
P0113 Manifold Absolute Pressure/Baro-
metric Pressure Circuit High Input CUIT HIGH INPUT, Diagnostic Procedure with Diagnostic Trouble Code
(DTC).>
P0117 Engine Coolant Temperature Cir-
cuit Low Input TURE CIRCUIT LOW INPUT, Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>
P0118 Engine Coolant Temperature Cir-
cuit High Input TURE CIRCUIT HIGH INPUT, Diagnostic Procedure with Diagnostic Trouble
Code (DTC).>