SUBARU FORESTER 2004 Service Repair Manual

EN(H4DOTC)-41
ENGINE (DIAGNOSTIC)
Inspection Mode
P0545 Exhaust Gas Temperature Sensor Circuit Low - Bank 1 —
P0558 Generator Circuit Low Input —
P0559 Generator Circuit High Input —
P0565 Cruise Control On Signal —
P0600 Serial Communication Link —
P0604 Internal Control Module Random Access Memory (RAM) Error —
P0691 Cooling Fan 1 Control Circuit Low —
P0692 Cooling Fan 1 Control Circuit High —
P0700 Transmission Control System (MIL Request) —
P0851 Neutral Switch Input Circuit Low —
P0852 Neutral Switch Input Circuit High —
P1086 Tumble Generated Valve Position Sensor 2 Circuit Low —
P1087 Tumble Generated Valve Position Sensor 2 Circuit High —
P1088 Tumble Generated Valve Position Sensor 1 Circuit Low —
P1089 Tumble Generated Valve Position Sensor 1 Circuit High —
P1091 Tumble Generated Valve System 1 (Valve Close) —
P1093 Tumble Generated Valve System 2 (Valve Close) —
P1094 Tumble Generated Valve Signal 1 Circuit Malfunction (Open) —
P1095 Tumble Generated Valve Signal 1 Circuit Malfunction (Short) —
P1096 Tumble Generated Valve Signal 2 Circuit Malfunction (Open) —
P1097 Tumble Generated Valve Signal 2 Circuit Malfunction (Short) —
P1110 Atmospheric Pressure Sensor Circuit Malfunction (Low Input) —
P1111 Atmospheric Pressure Sensor Circuit Malfunction (High Input) —
P1152 O
2 Sensor Circuit Range/Performance (Low) (Bank 1 Sensor 1) —
P1153 O
2 Sensor Circuit Range/Performance (High) (Bank 1 Sensor 1) —
P1306 OCV Solenoid Valve Signal 1 Circuit Malfunction (Open) —
P1307 OCV Solenoid Valve Signal 1 Circuit Malfunction (Short) —
P1308 OCV Solenoid Valve Signal 2 Circuit Malfunction (Open) —
P1309 OCV Solenoid Valve Signal 2 Circuit Malfunction (Short) —
P1518 Starter Switch Circuit Low Input —
P1544 Exhaust Gas Temperature Too High —
P1560 Back-Up Voltage Circuit Malfunction —
P1570 ANTENNA—
P1571 Reference Code Incompatibility —
P1572 IMM Circuit Failure (Except Antenna Circuit) —
P1574 Key Communication Failure —
P1576 EGI Control Module EEPROM —
P1577 IMM Control Module EEPROM —DTC Item On condition

EN(H4DOTC)-42
ENGINE (DIAGNOSTIC)
Inspection Mode
1. PREPARATION FOR THE INSPECTION
MODE
1) Check battery voltage is more than 12 V and fuel
remains half [20 to 402 (5.3 to 10.6 US gal, 4.4 to
8.8 Imp gal)].
2) Lift-up the vehicle using a garage jack and place
it on rigid racks or drive the vehicle onto free rollers.
WARNING:
 Before raising the vehicle, ensure parking
brakes are applied.
 Do not use a pantograph jack in place of a rig-
id rack.
 Secure a rope or wire to the front or rear tow-
ing hooks to prevent the lateral runout of front
wheels.
 Do not abruptly depress/release clutch pedal
or accelerator pedal during works even when
the engine is operating at low speeds since this
may cause vehicle to jump off free rollers.
 In order to prevent the vehicle from slipping
due to vibration, do not place any wooden
blocks or similar items between the rigid racks
and the vehicle.
 Since the rear wheels will also rotate, do not
place anything near them.Also, make sure that
nobody goes in front of the vehicle.
2. SUBARU SELECT MONITOR
1) After clearing the memory, check for any remain-
ing unresolved trouble data. <Ref. to
EN(H4DOTC)-47, Clear Memory Mode.>
2) Idle the engine.
3) Prepare the Subaru Select Monitor kit. <Ref. to
EN(H4DOTC)-8, PREPARATION TOOL, General
Description.>
4) Connect the diagnosis cable to Subaru Select
Monitor.
5) Insert the cartridge to Subaru Select Monitor.
<Ref. to EN(H4DOTC)-8, PREPARATION TOOL,
General Description.>
6) Connect the test mode connector (A) located at
the lower portion of instrument panel (on the driv-
er’s side).
(A) Rigid rack
(B) Free rollers
EN-00041
(A)
(B)
(A) Test mode connector
EN-00038
EN-00039
EN-00333
(A)

EN(H4DOTC)-43
ENGINE (DIAGNOSTIC)
Inspection Mode
7) Connect the Subaru Select Monitor to data link
connector.
(1) Connect the Subaru Select Monitor to data
link connector located in the lower portion of the
instrument panel (on the driver’s side).
(2) Connect the diagnosis cable to data link
connector.
CAUTION:
Do not connect the scan tools except for Suba-
ru Select Monitor and OBD-II general scan tool.
8) Turn the ignition switch to ON (engine OFF) and
Subaru Select Monitor switch to ON.
9) On the «Main Menu» display screen, select the
{Each System Check} and press the [YES] key.
10) On the «System Selection Menu» display
screen, select the {Engine} and press the [YES]
key.
11) Press the [YES] key after the information of en-
gine type was displayed.
12) On the «Engine Diagnosis» screen, select the
{D Check} and press the [YES] key.
13) When the “Perform D Check?” is shown on the
screen, press the [YES] key.14) Perform subsequent procedures as instructed
on the display screen.
 If trouble still remains in the memory, the corre-
sponding DTC appears on the display screen.
NOTE:
 For detailed operation procedure, refer to the
“SUBARU SELECT MONITOR OPERATION MAN-
UAL”.
 For details concerning DTCs, refer to the List of
Diagnostic Trouble Code (DTC).
<Ref. to EN(H4DOTC)-74, List of Diagnostic Trou-
ble Code (DTC).>
 Release the parking brake.
 The speed difference between front and rear
wheels may light either the ABS warning light, but
this indicates no malfunctions.When engine control
diagnosis is finished, perform the ABS memory
clearance procedure of self-diagnosis function.
3. OBD-II GENERAL SCAN TOOL
1) After performing the diagnostics and clearing the
memory, check for any remaining unresolved trou-
ble data. <Ref. to EN(H4DOTC)-47, Clear Memory
Mode.>
2) Idle the engine.
3) Connect the test mode connector (A) located at
the lower portion of instrument panel (on the driv-
er’s side).
4) Connect the OBD-II general scan tool to its data
link connector in the lower portion of the instrument
panel (on the driver’s side).
CAUTION:
Do not connect the scan tools except for Suba-
ru Select Monitor and OBD-II general scan tool.
(A) Power switch
EN-00334
EN-00040
(A)
EN-00333
(A)
EN-00334

EN(H4DOTC)-44
ENGINE (DIAGNOSTIC)
Inspection Mode
5) Start the engine.
NOTE:
 Ensure the select lever is placed in the “P” range
before starting.(AT model)
 Depress the clutch pedal when starting the en-
gine.(MT model)
6) Using the selector lever or shift lever, turn the “P”
range switch and the “N” range switch to ON.
7) Depress the brake pedal to turn the brake switch
ON.(AT model)
8) Keep the engine speed in the 2,500 — 3,000
rpm range for 40 seconds.
9) Place the select lever or shift lever in the “D”
range (AT model) or “1st” gear (MT model) and
drive the vehicle at 5 to 10 km/h (3 to 6 MPH).
NOTE:
 On AWD vehicles, release the parking brake.
 The speed difference between front and rear
wheels may light either the ABS warning light, but
this indicates no malfunctions.When engine control
diagnosis is finished, perform the ABS memory
clearance procedure of self-diagnosis function.
10) Using the OBD-II general scan tool, check
DTC(s) and record the result(s).
NOTE:
 For detailed operation procedures, refer to the
OBD-II General Scan Tool Operation Manual.
 For details concerning DTCs, refer to the List of
Diagnostic Trouble Code (DTC).
<Ref. to EN(H4DOTC)-74, List of Diagnostic Trou-
ble Code (DTC).>

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. <Ref. to EN(H4DOTC)-47, Clear Memory Mode.>
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)-47
ENGINE (DIAGNOSTIC)
Clear Memory Mode
14.Clear Memory Mode
A: OPERATION
1. SUBARU SELECT MONITOR (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 en-
gine type was displayed.
4) On the «Engine Diagnosis» display screen, se-
lect the {Memory Clear} and press the [YES] key.
5) When the “Done” are shown on the display
screen, turn the Subaru Select Monitor to OFF after
turning the ignition switch to OFF.
NOTE:
For detailed operation procedure, refer to the “SUBA-
RU SELECT MONITOR OPERATION MANUAL”.
2. SUBARU SELECT MONITOR (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 en-
gine type was displayed.
4) On the «Engine Diagnosis» display screen, se-
lect the {OBD System} and press the [YES] key.
5) On the «OBD Menu» display screen, select the
{DTC Clear} and press the [YES] key.
6) When the “Perform Diagnostic Code(s) Clear?”
is shown on the screen, press the [YES] key.
7) Turn the ignition switch to OFF and then turn the
SUBARU SELECT MONITOR to OFF.
NOTE:
For detailed operation procedure, refer to the “SUBA-
RU SELECT MONITOR OPERATION MANUAL”.
3. OBD-II GENERAL SCAN TOOL
For clear memory procedures using the OBD-II
general scan tool, refer to the OBD-II General Scan
Tool Instruction Manual.

EN(H4DOTC)-48
ENGINE (DIAGNOSTIC)
Compulsory Valve Operation Check Mode
15.Compulsory Valve Operation
Check Mode
A: OPERATION
1) Prepare the Subaru Select Monitor kit. <Ref. to
EN(H4DOTC)-8, PREPARATION TOOL, General
Description.>
2) Connect the diagnosis cable to Subaru Select
Monitor.
3) Insert the cartridge to Subaru Select Monitor.
<Ref. to EN(H4DOTC)-8, PREPARATION TOOL,
General Description.>
4) Connect the test mode connector (A) located at
the lower portion of instrument panel (on the driv-
er’s side).5) Connect the Subaru Select Monitor to data link
connector.
(1) Connect the Subaru Select Monitor to data
link connector located in the lower portion of the
instrument panel (on the driver’s side).
(2) Connect the diagnosis cable to data link
connector.
CAUTION:
Do not connect the scan tools except for Suba-
ru Select Monitor and OBD-II general scan tool.
6) Turn the ignition switch to ON (engine OFF) and
Subaru Select Monitor switch to ON.
7) On the «Main Menu» display screen, select the
{Each System Check} and press the [YES] key.
8) On the «System Selection Menu» display screen,
select the {Engine} and press the [YES] key.
9) Press the [YES] key after the information of en-
gine type was displayed.
10) On the «Engine Diagnosis» display screen, se-
lect the {System Operation Check Mode} and press
the [YES] key.
11) On the «System Operation Check Mode» screen,
select the {Actuator ON/OFF Operation} and press
the [YES] key.
12) On the «Actuator ON/OFF Operation» screen,
select the desired compulsory actuator and press
the [YES] key.
EN-00038
EN-00039
EN-00333
(A)
(A) Power switch
EN-00334
EN-00040
(A)

EN(H4DOTC)-49
ENGINE (DIAGNOSTIC)
Compulsory Valve Operation Check Mode
13) Pressing the [NO] key completes the compul-
sory operation check mode.The display will then re-
turn to the «Actuator ON/OFF Operation» screen.
 A list of the support data is shown in the following
table.
NOTE:
 The following parts will be displayed but not func-
tional.
 For detailed operation procedure, refer to the
“SUBARU SELECT MONITOR OPERATION MAN-
UAL”.
Description Display
Compulsory fuel pump relay operation
checkFuel Pump
Compulsory radiator fan relay operation
checkRadiator Fan
Relay
Compulsory air conditioning relay oper-
ation checkA/C Compressor
Relay
Compulsory purge control solenoid
valve operation checkCPC Solenoid
Compulsory wastegate control sole-
noid valve operation checkWastegate con-
trol solenoid
Display
EGR Solenoid
ASV Solenoid
PCV Solenoid
Vent Control Solenoid
FICD Solenoid
Pressure Switching Solenoid1
Pressure Switching Solenoid2
EXH. Bypass Control Permit Flag
AAI Solenoid
Atmospheric pressure switching solenoid

EN(H4DOTC)-50
ENGINE (DIAGNOSTIC)
Malfunction Indicator Light
16.Malfunction Indicator Light
A: PROCEDURE
1. Activation of malfunction indicator light. <Ref. to EN(H4DOTC)-51, ACTIVATION OF MALFUNCTION INDICATOR LIGHT, Mal-
function Indicator Light.>
↓
2. Check that the malfunction indicator light does not come on. <Ref. to EN(H4DOTC)-52, MALFUNCTION INDICATOR LIGHT
DOES NOT COME ON, Malfunction Indicator Light.>
↓
3. Check that the malfunction indicator light does not go off. <Ref. to EN(H4DOTC)-54, MALFUNCTION INDICATOR LIGHT
DOES NOT GO OFF, Malfunction Indicator Light.>
↓
4. Malfunction indicator light does not blink at a cycle of 3 Hz. <Ref. to EN(H4DOTC)-55, MALFUNCTION INDICATOR LIGHT
DOES NOT BLINK AT A CYCLE OF 3 HZ, Malfunction Indicator Light.>
↓
5. Malfunction indicator light remains blinking at a cycle of 3 Hz. <Ref. to EN(H4DOTC)-57, MALFUNCTION INDICATOR LIGHT
REMAINS BLINKING AT A CYCLE OF 3 HZ, Malfunction Indicator Light.>