SUBARU FORESTER 2004 Service Repair Manual

EN(H4DOTC 2.5)-37
ENGINE (DIAGNOSTIC)
Inspection Mode
1. PREPARATION FOR THE INSPECTION
MODE
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) 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) Idle the engine.
2) Prepare the Subaru Select Monitor kit. <Ref. to
EN(H4DOTC 2.5)-7, PREPARATION TOOL, Gen-
eral Description.>
3) Connect the diagnosis cable to Subaru Select
Monitor.
Insert the cartridge to Subaru Select Monitor. <Ref.
to EN(H4DOTC 2.5)-7, 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).
(A) Rigid rack
(B) Free rollers
EN-00041
(A)
(B)
(A) Test Mode Connector
EN-00038
EN-00039
EN-00333
(A)

EN(H4DOTC 2.5)-38
ENGINE (DIAGNOSTIC)
Inspection Mode
5) Connect the Subaru Select Monitor to data link
connector located in the lower portion of the instru-
ment 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.
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» screen, select the
{D Check} and press the [YES] key.
11) When the “Perform D Check?” is shown on the
screen, press the [YES] key.
12) 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 “SUB-
ARU SELECT MONITOR OPERATION MANUAL”.
 For details concerning DTCs, refer to the List of
Diagnostic Trouble Code (DTC).
<Ref. to EN(H4DOTC 2.5)-65, List of Diagnostic
Trouble 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 diag-
nosis is finished, perform the ABS memory clearance
procedure of self-diagnosis function. <Ref. to ABS-
23, Clear Memory Mode.>
3. OBD-II GENERAL SCAN TOOL
1) Idle the engine.
2) Connect the test mode connector (A) located at
the lower portion of instrument panel (on the driv-
er’s side).
3) 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.
4) 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)
5) Using the select lever or shift lever, turn the “P”
position switch and the “N” position switch to ON.
6) Depress the brake pedal to turn the brake switch
ON. (AT model)
7) Keep the engine speed in the 2,500 — 3,000
rpm range for 40 seconds.
8) 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).
(A) Power switch
EN-02353
EN-00040
(A)
EN-00333
(A)
EN-02353

EN(H4DOTC 2.5)-39
ENGINE (DIAGNOSTIC)
Inspection Mode
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 con-
trol diagnosis is finished, perform the ABS memory
clearance procedure of self-diagnosis function.
<Ref. to ABS-23, Clear Memory Mode.>
9) 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 2.5)-65, List of Diagnostic
Trouble Code (DTC).>

EN(H4DOTC 2.5)-40
ENGINE (DIAGNOSTIC)
Drive Cycle
12.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) Disconnect the test mode connectors.
NOTE:
Be sure to perform the diagnosis after idling from starting the cooled engine except when the engine coolant
temperature is specified.
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
P0546 Exhaust Gas Temperature Sensor Circuit High - Bank 1 —
P0692 Cooling Fan 1 Control Circuit High —
DTC Item On condition
P0171 System Too Lean (Bank 1) —
P0172 System Too Rich (Bank 2) —

EN(H4DOTC 2.5)-41
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
P0134 O
2 Sensor Circuit No Activity Detected (Bank 1 Sensor 1)
—
P0246 Turbo/Super Charger Wastegate Solenoid “A” High —
P1090 Tumble Generated Valve System 1 (Valve Open) —
P1092 Tumble Generated Valve System 2 (Valve Open) —
EN-00842
(C) (H)
(I) (60)
97
64(40)
(B)
(A)(F) (D)
(E)
150 100 50 0(G)

EN(H4DOTC 2.5)-42
ENGINE (DIAGNOSTIC)
Clear Memory Mode
13.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 “SUB-
ARU 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 “SUB-
ARU 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 2.5)-43
ENGINE (DIAGNOSTIC)
Compulsory Valve Operation Check Mode
14.Compulsory Valve Operation
Check Mode
A: OPERATION
1) Prepare the Subaru Select Monitor kit. <Ref. to
EN(H4DOTC 2.5)-7, PREPARATION TOOL, Gen-
eral Description.>
2) Connect the diagnosis cable to Subaru Select
Monitor.
3) Insert the cartridge to Subaru Select Monitor. <Ref.
to EN(H4DOTC 2.5)-7, 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 located in the lower portion of the instru-
ment 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.
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-02353
EN-00040
(A)

EN(H4DOTC 2.5)-44
ENGINE (DIAGNOSTIC)
Compulsory Valve Operation Check Mode
13) Pressing the [NO] key completes the compulso-
ry 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 “SUB-
ARU SELECT MONITOR OPERATION MANUAL”.
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 operation checkWastegate con-
trol solenoid
Display
EGR Solenoid
ASV Solenoid
FICD Solenoid
Vent. solenoid
Atmospheric pressure switching solenoid 1
AAI Solenoid
PCV Solenoid
Atmospheric pressure switching solenoid 2
EXH. Bypass control permit flag

EN(H4DOTC 2.5)-45
ENGINE (DIAGNOSTIC)
Malfunction Indicator Light
15.Malfunction Indicator Light
A: PROCEDURE
B: ACTIVATION OF MALFUNCTION
INDICATOR LIGHT
1) When the ignition switch is turned to ON (engine
off), the malfunction indicator light in the combina-
tion meter illuminates.
NOTE:
If the malfunction indicator light does not illuminate,
perform the diagnosis of malfunction indicator light
circuit or the combination meter circuit. <Ref. to
EN(H4DOTC 2.5)-47, MALFUNCTION INDICA-
TOR LIGHT DOES NOT COME ON, Malfunction
Indicator Light.>2) After starting the engine, the malfunction indica-
tor light goes out. If it does not, either the engine or
the emission control system is malfunctioning.
1. Activation of malfunction indicator light. <Ref. to EN(H4DOTC 2.5)-45, ACTIVATION OF MALFUNCTION INDICATOR LIGHT,
Malfunction Indicator Light.>
↓
2. Check that the malfunction indicator light does not come on. <Ref. to EN(H4DOTC 2.5)-47, 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 2.5)-49, 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 2.5)-50, 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 2.5)-52, MALFUNCTION INDICATOR
LIGHT REMAINS BLINKING AT A CYCLE OF 3 HZ, Malfunction Indicator Light.>
(A) Malfunction indicator light
EN-00335(A)
(1) No faulty
(2) Trouble occurs
(3) ON
(4) OFF
(5) Ignition switch ON
(6) Engine start
EN-01679
(1)
(2)
(5)
(6)(3)
(4)
(3)
(4)

EN(H4DOTC 2.5)-46
ENGINE (DIAGNOSTIC)
Malfunction Indicator Light
3) If the diagnosis system detects a misfire which
could damage the catalyst, the malfunction indica-
tor light will blink at a cycle of 1 Hz.
4) When the ignition switch is turned to ON (engine
off) or to “START” with the test mode connector
connected, the malfunction indicator light blinks at
a cycle of 3 Hz.
(1) ON
(2) OFF
(3) Ignition switch ON
(4) Engine start
(5) Misfire start
(6) 1 second
(1) ON
(2) OFF
(3) Ignition switch ON
(4) 1 second
EN-01680
(2) (1)
(3)
(4)
(5)(6)
EN-01681
(2)(1)
(4)
(3)