Subaru 2004 Forester User manual

FUJI HEAVY INDUSTRIES LTD. G8080GE3

2004 FORESTER SERVICE MANUAL QUICK REFERENCE INDEX

ENGINE SECTION 2

This service manual has been prepared

to provide SUBARU service personnel

with the necessary information and data

for the correct maintenance and repair

of SUBARU vehicles.

This manual includes the procedures

for maintenance, disassembling, reas-

sembling, inspection and adjustment of

components and diagnostics for guid-

ance of experienced mechanics.

Please peruse and utilize this manual

fully to ensure complete repair work for

satisfying our customers by keeping

their vehicle in optimum condition.

When replacement of parts during

repair work is needed, be sure to use

SUBARU genuine parts.

All information, illustration and specifi-

cations contained in this manual are

based on the latest product information

available at the time of publication

approval.

FUEL INJECTION (FUEL SYSTEM) FU(H4DOTC)

EMISSION CONTROL

(AUX. EMISSION CONTROL DEVICE)

EC(H4DOTC)

INTAKE (INDUCTION) IN(H4DOTC)

MECHANICAL ME(H4DOTC)

EXHAUST EX(H4DOTC)

COOLING CO(H4DOTC)

LUBRICATION LU(H4DOTC)

SPEED CONTROL SYSTEM SP(H4DOTC)

IGNITION IG(H4DOTC)

STARTING/CHARGING SYSTEM SC(H4DOTC)

ENGINE (DIAGNOSTIC) EN(H4DOTC)

ENGINE (DIAGNOSTIC)

EN(H4DOTC)

Page

1. Basic Diagnostics Procedure ......................................................................2

2. Check List for Interview...............................................................................4

3. General Description ....................................................................................6

4. Electrical Component Location ...................................................................9

5. Engine Control Module (ECM) I/O Signal .................................................23

6. Engine Condition Data ..............................................................................27

7. Transmission Control Module (TCM) I/O Signal .......................................28

8. Data Link Connector .................................................................................29

9. OBD-II General Scan Tool ........................................................................30

10. Subaru Select Monitor...............................................................................33

11. Read Diagnostic Trouble Code (DTC) ......................................................39

12. Inspection Mode........................................................................................40

13. Drive Cycle................................................................................................45

14. Clear Memory Mode..................................................................................47

15. Compulsory Valve Operation Check Mode ...............................................48

16. Malfunction Indicator Light ........................................................................50

17. Diagnostics for Engine Starting Failure.....................................................59

18. List of Diagnostic Trouble Code (DTC) .....................................................74

19. Diagnostic Procedure with Diagnostic Trouble Code (DTC) .....................80

20. General Diagnostic Table........................................................................295

EN(H4DOTC)-80

ENGINE (DIAGNOSTIC)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

19.Diagnostic Procedure with Diagnostic Trouble Code (DTC)

A: DTC P0011 “A” CAMSHAFT POSITION - TIMING OVER - ADVANCED OR

SYSTEM PERFORMANCE (BANK 1)

DTC DETECTING CONDITION:

Detect as soon as the malfunction occurs.

TROUBLE SYMPTOM:

• Engine stalls.

• Erroneous idling

CAUTION:

After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOTC)-47, OP-

ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOTC)-40, Inspection Mode.>.

Step Check Yes No

1 CHECK DTC ON DISPLAY. Is any other DTC displayed? Inspect the rele-

vant DTC using

“List of Diagnostic

Trouble Code

(DTC)”. <Ref. to

EN(H4DOTC)-74,

List of Diagnostic

Trouble Code

(DTC).>

Go to step 2.

2 CHECK CURRENT DATA.

1) Start the engine and idle it.

2) Check the AVCS system operating angle

and oil flow control solenoid valve duty output

using Subaru Select Monitor or OBD-II general

scan tool.

N

O

TE:

• Subaru Select Monitor

For detailed operation procedure, refer to

“READ CURRENT DATA SHOWN ON DIS-

PLAY FOR ENGINE”. <Ref. to EN(H4DOTC)-

33, Subaru Select Monitor.>

• OBD-II general scan tool

For detailed operation procedures, refer to the

OBD-II General Scan Tool Operation Manual.

Is the AVCS system operating

angle approx. 0 degree and oil

flow control solenoid valve duty

output approx. 10%?

A temporary poor

malfunction. Per-

form the following

to clean oil routing.

Replace the

engine oil, and

then idle the

engine for 5 min-

utes and replace

the oil filter and

engine oil.

Check the follow-

ing and repair or

replace it if neces-

sary.

• Oil pipe (clog-

ging)

• Oil flow con-

trol solenoid

valve (clogging

or dirt of oil

routing, spring

setting, clog-

ging of valve)

• Intake cam-

shaft (dirt, dam-

age of

camshaft)

• Timing belt

(alignment of

timing mark)

EN(H4DOTC)-81

ENGINE (DIAGNOSTIC)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

B: DTC P0021 “A” CAMSHAFT POSITION - TIMING OVER - ADVANCED OR

SYSTEM PERFORMANCE (BANK 2)

DTC DETECTING CONDITION:

Detect as soon as the malfunction occurs.

TROUBLE SYMPTOM:

• Engine stalls.

• Erroneous idling

CAUTION:

After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOTC)-47, OP-

ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOTC)-40, Inspection Mode.>.

Step Check Yes No

1 CHECK DTC ON DISPLAY. Is any other DTC displayed? Inspect the rele-

vant DTC using

“List of Diagnostic

Trouble Code

(DTC)”. <Ref. to

EN(H4DOTC)-74,

List of Diagnostic

Trouble Code

(DTC).>

Go to step 2.

2 CHECK CURRENT DATA.

1) Start the engine and idle it.

2) Check the AVCS system operating angle

and oil flow control solenoid valve duty output

using Subaru Select Monitor or OBD-II general

scan tool.

NOTE:

• Subaru Select Monitor

For detailed operation procedure, refer to

“READ CURRENT DATA SHOWN ON DIS-

PLAY FOR ENGINE”. <Ref. to EN(H4DOTC)-

33, Subaru Select Monitor.>

• OBD-II general scan tool

For detailed operation procedures, refer to the

OBD-II General Scan Tool Operation Manual.

Is the AVCS system operating

angle approx. 0 degree and oil

flow control solenoid valve duty

output approx. 10%?

A temporary poor

malfunction. Per-

form the following

to clean oil routing.

Replace the

engine oil, and

then idle the

engine for 5 min-

utes and replace

the oil filter and

engine oil.

Check the follow-

ing and repair or

replace it if neces-

sary.

• Engine oil

(amount, dirt)

• Oil pipe (clog-

ging)

• Oil flow con-

trol solenoid

valve (clogging

or dirt of oil

routing, spring

setting, clog-

ging of valve)

• Intake cam-

shaft (dirt, dam-

age of

camshaft)

• Timing belt

(alignment of

timing mark)

EN(H4DOTC)-82

ENGINE (DIAGNOSTIC)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

C: DTC P0031 HO2S HEATER CONTROL CIRCUIT LOW (BANK 1 SENSOR 1)

DTC DETECTING CONDITION:

Two consecutive driving cycles with fault

CAUTION:

After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOTC)-47, OP-

ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOTC)-40, Inspection Mode.>.

WIRING DIAGRAM:

EN-02320

BATTERY

MAIN RELAY

SBF-5

B47

1

2

3

5

4

6

E

B100

F2

14

LHD

RHD

LHD

RHD

B100

F2

F60

E3

203

RHD

6

7

2

3

33

26

25

ECM

B134

: LHD

B21

: RHD

1

4

2

3

B262

FRONT OXYGEN

(A/F) SENSOR

34

12

56

123

4

56

7

8

9

10

11 12

13

14 15 16

B21

F60

B47

B262

B134

F2

LHDLHD

1

2

3

4

56 7

8

21

9

43

10

2422 23 25

11 12 13 14 15

26 27

28

16 17

18 19 20 21

33 3429

3230 31

1234 56789

10 11 12 13 14 15 16 17 18 19 20

: LHD

E2

: RHD

EN(H4DOTC)-83

ENGINE (DIAGNOSTIC)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Step Check Yes No

1 CHECK HARNESS BETWEEN ECM AND

FRONT OXYGEN (A/F) SENSOR CONNEC-

TOR.

1) Start the engine, and warm-up the engine.

2) Turn the ignition switch to OFF.

3) Disconnect the connector from ECM and

front oxygen (A/F) sensor.

4) Measure the resistance of harness

between ECM and front oxygen (A/F) sensor

connector.

Connector & terminal

(B134)No. 2 — (B262)No. 2:

(B134)No. 3 — (B262)No. 2:

Is the resistance less than 1

Ω?

Go to step 2. Repair the open

circuit in harness

between ECM and

front oxygen (A/F)

sensor connector.

2 CHECK HARNESS BETWEEN ECM AND

FRONT OXYGEN (A/F) SENSOR CONNEC-

TOR.

Measure the resistance of harness between

ECM and front oxygen (A/F) sensor connector.

Connector & terminal

(B134) No. 33 — (B262) No. 4:

(B134) No. 26 — (B262) No. 3:

Is the resistance less than 1

Ω?

Go to step 3. Repair the open

circuit in harness

between ECM and

front oxygen (A/F)

sensor connector.

3 CHECK HARNESS BETWEEN ECM AND

FRONT OXYGEN (A/F) SENSOR CONNEC-

TOR.

Measure the resistance of harness between

main relay and front oxygen (A/F) sensor con-

nector.

Connector & terminal

(B47) No. 4 — (B262) No. 1:

Is the resistance less than 1

Ω?

Go to step 4. Repair the open

circuit in harness

between ECM and

front oxygen (A/F)

sensor connector.

4 CHECK FRONT OXYGEN (A/F) SENSOR.

Measure the resistance between front oxygen

(A/F) sensor connector terminals.

Terminals

No. 2 — No. 1:

Is the resistance less than 5

Ω?

Go to step 5. Replace the front

oxygen (A/F) sen-

sor. <Ref. to

FU(H4DOTC)-45,

Front Oxygen (A/

F) Sensor.>

5 CHECK POOR CONTACT.

Check poor contact in ECM and front oxygen

(A/F) sensor connector.

Is there poor contact in ECM or

front oxygen (A/F) sensor con-

nector?

Repair the poor

contact in ECM

and front oxygen

(A/F) sensor.

Replace the front

oxygen (A/F) sen-

sor. <Ref. to

FU(H4DOTC)-45,

Front Oxygen (A/

F) Sensor.>

EN(H4DOTC)-84

ENGINE (DIAGNOSTIC)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

D: DTC P0031 HO2S HEATER CONTROL CIRCUIT LOW (BANK 1 SENSOR 1)

DTC DETECTING CONDITION:

Detect as soon as the malfunction occurs.

CAUTION:

After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOTC)-47, OP-

ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOTC)-40, Inspection Mode.>.

WIRING DIAGRAM:

EN-02320

BATTERY

MAIN RELAY

SBF-5

B47

1

2

3

5

4

6

E

B100

F2

14

LHD

RHD

LHD

RHD

B100

F2

F60

E3

203

RHD

6

7

2

3

33

26

25

ECM

B134

: LHD

B21

: RHD

1

4

2

3

B262

FRONT OXYGEN

(A/F) SENSOR

34

12

56

123

4

56

7

8

9

10

11 12

13

14 15 16

B21

F60

B47

B262

B134

F2

LHDLHD

1

2

3

4

56 7

8

21

9

43

10

2422 23 25

11 12 13 14 15

26 27

28

16 17

18 19 20 21

33 3429

3230 31

1234 56789

10 11 12 13 14 15 16 17 18 19 20

: LHD

E2

: RHD

EN(H4DOTC)-85

ENGINE (DIAGNOSTIC)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Step Check Yes No

1 CHECK POWER SUPPLY TO FRONT OXY-

GEN (A/F) SENSOR.

1) Turn the ignition switch to OFF.

2) Disconnect the connector from front oxygen

(A/F) sensor.

3) Turn the ignition switch to ON.

4) Measure the voltage between front oxygen

(A/F) sensor connector and engine ground.

Connector & terminal

(B262) No. 1 (+) — Engine ground (

−

):

Is the voltage more than 10 V? Go to step 2. Repair the power

supply line.

N

O

TE:

In this case repair

the following:

• Open circuit in

harness between

main relay and

front oxygen (A/F)

sensor

• CHECK POOR

CONTACT OF

FRONT OXYGEN

(A/F) SENSOR.

• Poor contact in

main relay connec-

tor

2 CHECK GROUND CIRCUIT FOR ECM.

Measure the resistance of harness between

ECM connector and chassis ground.

Connector & terminal

(B134) No. 6 — Chassis ground:

(B134) No. 7 — Chassis ground:

Is the resistance less than 5

Ω?

Go to step 3. Repair the har-

ness and connec-

tor.

N

O

TE:

In this case repair

the following:

• Open circuit in

harness between

ECM and engine

ground cable

• Poor contact in

ECM connector.

• Poor contact in

coupling connector

3 CHECK CURRENT DATA.

1) Start the engine.

2) Read the data of front oxygen (A/F) sensor

heater current using Subaru Select Monitor or

OBD-II general scan tool.

N

O

TE:

• Subaru Select Monitor

For detailed operation procedure, refer to

“READ CURRENT DATA SHOWN ON DIS-

PLAY FOR ENGINE”. <Ref. to EN(H4DOTC)-

33, Subaru Select Monitor.>

• OBD-II general scan tool

For detailed operation procedures, refer to the

OBD-II General Scan Tool Operation Manual.

Is the current more than 0.2 A? Repair poor con-

tact connector.

N

O

TE:

In this case repair

the following:

• Poor contact in

front oxygen (A/F)

sensor connector

• Poor contact in

ECM connector.

Go to step 4.

4 CHECK OUTPUT SIGNAL FROM ECM.

1) Start and idle the engine.

2) Measure the voltage between ECM con-

nector and chassis ground.

Connector & terminal

(B134) No. 2 (+) — Chassis ground (

−

):

Is the voltage less than 1 V? Go to step 6. Go to step 5.

5 CHECK OUTPUT SIGNAL FROM ECM.

Measure the voltage between ECM connector

and chassis ground.

Connector & terminal

(B134) No. 2 (+) — Chassis ground (

−

):

Does the voltage change by

shaking the harness and con-

nector of ECM while monitor-

ing the value with voltage

meter?

Repair the poor

contact in ECM

connector.

Go to step 6.

EN(H4DOTC)-86

ENGINE (DIAGNOSTIC)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

6 CHECK OUTPUT SIGNAL FROM ECM.

Measure the voltage between ECM connector

and chassis ground.

Connector & terminal

(B134) No. 3 (+) — Chassis ground (

−

):

Is the voltage less than 1 V? Go to step 8. Go to step 7.

7 CHECK OUTPUT SIGNAL FROM ECM.

Measure the voltage between ECM connector

and chassis ground.

Connector & terminal

(B134) No. 3 (+) — Chassis ground (

−

):

Does the voltage change by

shaking the harness and con-

nector of ECM while monitor-

ing the value with voltage

meter?

Repair the poor

contact in ECM

connector.

Go to step 8.

8 CHECK FRONT OXYGEN (A/F) SENSOR.

1) Turn the ignition switch to OFF.

2) Measure the resistance between front oxy-

gen (A/F) sensor connector terminals.

Terminals

No. 2 — No. 1:

Is the resistance less than 10

Ω?

Repair the har-

ness and connec-

tor.

N

O

TE:

In this case repair

the following:

• Open or ground

short circuit in har-

ness between front

oxygen (A/F) sen-

sor and ECM con-

nector

• Poor contact in

front oxygen (A/F)

sensor connector

• Poor contact in

ECM connector.

Replace the front

oxygen (A/F) sen-

sor. <Ref. to

FU(H4DOTC)-45,

Front Oxygen (A/

F) Sensor.>

Step Check Yes No

EN(H4DOTC)-87

ENGINE (DIAGNOSTIC)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

E: DTC P0032 HO2S HEATER CONTROL CIRCUIT HIGH (BANK 1 SENSOR 1)

DTC DETECTING CONDITION:

Detect as soon as the malfunction occurs.

CAUTION:

After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOTC)-47, OP-

ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOTC)-40, Inspection Mode.>.

WIRING DIAGRAM:

EN-02320

BATTERY

MAIN RELAY

SBF-5

B47

1

2

3

5

4

6

E

B100

F2

14

LHD

RHD

LHD

RHD

B100

F2

F60

E3

203

RHD

6

7

2

3

33

26

25

ECM

B134

: LHD

B21

: RHD

1

4

2

3

B262

FRONT OXYGEN

(A/F) SENSOR

34

12

56

123

4

56

7

8

9

10

11 12

13

14 15 16

B21

F60

B47

B262

B134

F2

LHDLHD

1

2

3

4

56 7

8

21

9

43

10

2422 23 25

11 12 13 14 15

26 27

28

16 17

18 19 20 21

33 3429

3230 31

1234 56789

10 11 12 13 14 15 16 17 18 19 20

: LHD

E2

: RHD

EN(H4DOTC)-88

ENGINE (DIAGNOSTIC)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Step Check Yes No

1 CHECK OUTPUT SIGNAL FROM ECM.

1) Turn the ignition switch to ON.

2) Measure the voltage between ECM con-

nector and chassis ground.

Connector & terminal

(B134) No. 2 (+) — Chassis ground (

−

):

(B134) No. 3 (+) — Chassis ground (

−

):

Is the voltage more than 8 V? Go to step 3. Go to step 2.

2 CHECK FRONT OXYGEN (A/F) SENSOR

HEATER CURRENT.

1) Turn the ignition switch to OFF.

2) Repair the battery short circuit in harness

between ECM and front oxygen (A/F) sensor

connector.

3) Turn the ignition switch to ON.

4) Read the data of front oxygen (A/F) sensor

heater current using Subaru Select Monitor or

OBD-II general scan tool.

N

O

TE:

• Subaru Select Monitor

For detailed operation procedure, refer to

“READ CURRENT DATA SHOWN ON DIS-

PLAY FOR ENGINE”. <Ref. to EN(H4DOTC)-

33, Subaru Select Monitor.>

• OBD-II general scan tool

For detailed operation procedures, refer to the

OBD-II General Scan Tool Operation Manual.

Is the current more than 2.3 A? Replace the ECM.

<Ref. to

FU(H4DOTC)-50,

Engine Control

Module (ECM).>

END.

3 CHECK OUTPUT SIGNAL FROM ECM.

Measure the voltage between ECM connector

and chassis ground.

Connector & terminal

(B134) No. 2 (+) — Chassis ground (

−

):

(B134) No. 3 (+) — Chassis ground (

−

):

Does the voltage change by

shaking the harness and con-

nector of ECM while monitor-

ing the value with voltage

meter?

Repair the battery

short circuit in har-

ness between

ECM and front

oxygen (A/F) sen-

sor connector.

END.

EN(H4DOTC)-89

ENGINE (DIAGNOSTIC)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

F: DTC P0037 HO2S HEATER CONTROL CIRCUIT LOW (BANK 1 SENSOR 2)

DTC DETECTING CONDITION:

Detect as soon as the malfunction occurs.

CAUTION:

After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOTC)-47, OP-

ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOTC)-40, Inspection Mode.>.

WIRING DIAGRAM:

MAIN RELAY

B47

1

2

3

5

4

6

E

T5

*

1

*

2

B18

3

B122

1

3

T6

REAR

OXYGEN SENSOR

A6

A7

D31

C35

ECM

B135

B136

B :

B134

A :

C :

1

4

B83

B2

D25

B137

D :

EN-02321

: LHD

: RHD

34

12

56

B21

B134

B135

F60

B83

B47

T6

B136

1

2 3 4 5 6

F2

21

4 3

LHD : 5

RHD : 4

LHD : 1

RHD : 1

*

1

*

2

BATTERY

B100 F2

14

LHD

RHD

LHD

RHD

LHD

RHD

LHD

RHD

4

6

E

B100

F2

F60

E3

203

RHD

LHD

RHD

: LHD

B21

: RHD

LHD

: LHD

E2

: RHD

B18

B122

B137

2345 6789

11 12 13 14 17 18 19 20

1

10 15 16

567

8

21

9

43

10

22 23

11 12 13 14 15

24 25

26

16 17

18 19 20 21

27 28 29 30 31

56

78

21

9

43

10

2422 23 25

11 12 13

14

15

26 27

28

16

17 18 19 20 21

33 34

29

32

30

31 35

1234

5 6

7 8

567

8

21

9

43

10

2422 23 25

11 12 13 14 15

26 27

28

16 17 18 19

20 21

29 30 31 32 33 34 35

123

4

56

7

8

9

10

11 12

13

14 15 16

1 2

3

4

2

T5

B18

56 7

8

21

9

43

10

2422 23 25

11 12 13 14 15

26 27

28

16 17

18 19 20 21

33 3429

3230 31

EN(H4DOTC)-90

ENGINE (DIAGNOSTIC)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Step Check Yes No

1 CHECK GROUND CIRCUIT FOR ECM.

1) Turn the ignition switch to OFF.

2) Disconnect the connector from ECM.

3) Measure the resistance of harness

between ECM connector and chassis ground.

Connector & terminal

(B134) No. 6 — Chassis ground:

(B134) No. 7 — Chassis ground:

Is the resistance less than 5

Ω?

Go to step 2. Repair the har-

ness and connec-

tor.

N

O

TE:

In this case repair

the following:

• Open circuit in

harness between

ECM and engine

ground cable

• Poor contact in

ECM connector.

• Poor contact in

coupling connector

2 CHECK CURRENT DATA.

1) Start the engine.

2) Read the data of rear oxygen (A/F) sensor

heater current using Subaru Select Monitor or

OBD-II general scan tool.

NOTE:

• Subaru Select Monitor

For detailed operation procedure, refer to the

“READ CURRENT DATA SHOWN ON DIS-

PLAY FOR ENGINE”. <Ref. to EN(H4DOTC)-

33, Subaru Select Monitor.>

• OBD-II general scan tool

For detailed operation procedures, refer to the

OBD-II General Scan Tool Operation Manual.

Is the current more than 0.2 A? Repair the con-

nector.

NOTE:

In this case repair

the following:

• Poor contact in

rear oxygen sen-

sor connector

• Poor contact in

rear oxygen sen-

sor connecting

harness connector

• Poor contact in

ECM connector.

Go to step 3.

3 CHECK OUTPUT SIGNAL FROM ECM.

1) Start and idle the engine.

2) Measure the voltage between ECM con-

nector and chassis ground.

Connector & terminal

(B135) No. 2 (+) — Chassis ground (

−

):

Is the voltage less than 1 V? Go to step 6. Go to step 4.

4 CHECK OUTPUT SIGNAL FROM ECM.

Measure the voltage between ECM connector

and chassis ground.

Connector & terminal

(B135) No. 2 (+) — Chassis ground (

−

):

Does the voltage change by

shaking the harness and con-

nector of ECM while monitor-

ing the value with voltage

meter?

Repair the poor

contact in ECM

connector.

Go to step 5.

5 CHECK OUTPUT SIGNAL FROM ECM.

1) Turn the ignition switch to OFF.

2) Disconnect the connector from rear oxygen

sensor.

3) Measure the voltage between ECM con-

nector and chassis ground.

Connector & terminal

(B135) No. 2 (+) — Chassis ground (

−

):

Is the voltage less than 1 V? Replace the ECM.

<Ref. to

FU(H4DOTC)-50,

Engine Control

Module (ECM).>

Repair battery

short circuit in har-

ness between

ECM and rear oxy-

gen sensor con-

nector.After repair,

replace the ECM.

<Ref. to

FU(H4DOTC)-50,

Engine Control

Module (ECM).>

EN(H4DOTC)-91

ENGINE (DIAGNOSTIC)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

6 CHECK POWER SUPPLY TO REAR OXY-

GEN SENSOR.

1) Turn the ignition switch to OFF.

2) Disconnect the connector from rear oxygen

sensor.

3) Turn the ignition switch to ON.

4) Measure the voltage between rear oxygen

sensor connector and engine ground or chas-

sis ground.

Connector & terminal

(T6) No. 1 (+) — Chassis ground (

−

):

Is the voltage more than 10 V? Go to step 7. Repair the power

supply line.

N

O

TE:

In this case repair

the following:

• Open circuit in

harness between

main relay and

rear oxygen sen-

sor connector

• Poor contact in

rear oxygen sen-

sor connector

• Poor contact in

coupling connector

7 CHECK REAR OXYGEN SENSOR.

1) Turn the ignition switch to OFF.

2) Measure the resistance between rear oxy-

gen sensor connector terminals.

Terminals

No. 1 — No. 2:

Is the resistance less than 30

Ω?

Repair the har-

ness and connec-

tor.

N

O

TE:

In this case repair

the following:

• Open circuit in

harness between

rear oxygen sen-

sor and ECM con-

nector

• Poor contact in

rear oxygen sen-

sor connector

• Poor contact in

ECM connector.

• Poor contact in

coupling connector

Replace the rear

oxygen sensor.

<Ref. to

FU(H4DOTC)-47,

Rear Oxygen Sen-

sor.>

Step Check Yes No

EN(H4DOTC)-92

ENGINE (DIAGNOSTIC)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

G: DTC P0038 HO2S HEATER CONTROL CIRCUIT HIGH (BANK 1 SENSOR 2)

DTC DETECTING CONDITION:

Immediately at fault recognition

CAUTION:

After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOTC)-47, OP-

ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOTC)-40, Inspection Mode.>.

WIRING DIAGRAM:

MAIN RELAY

B47

1

2

3

5

4

6

E

T5

*

1

*

2

B18

3

B122

1

3

T6

REAR

OXYGEN SENSOR

A6

A7

D31

C35

ECM

B135

B136

B :

B134

A :

C :

1

4

B83

B2

D25

B137

D :

EN-02321

: LHD

: RHD

34

12

56

B21

B134

B135

F60

B83

B47

T6

B136

1

2 3 4 5 6

F2

21

4 3

LHD : 5

RHD : 4

LHD : 1

RHD : 1

*

1

*

2

BATTERY

B100 F2

14

LHD

RHD

LHD

RHD

LHD

RHD

LHD

RHD

4

6

E

B100

F2

F60

E3

203

RHD

LHD

RHD

: LHD

B21

: RHD

LHD

: LHD

E2

: RHD

B18

B122

B137

2345 6789

11 12 13 14 17 18 19 20

1

10 15 16

567

8

21

9

43

10

22 23

11 12 13 14 15

24 25

26

16 17

18 19 20 21

27 28 29 30 31

56

78

21

9

43

10

2422 23 25

11 12 13

14

15

26 27

28

16

17 18 19 20 21

33 34

29

32

30

31 35

1234

5 6

7 8

567

8

21

9

43

10

2422 23 25

11 12 13 14 15

26 27

28

16 17 18 19

20 21

29 30 31 32 33 34 35

123

4

56

7

8

9

10

11 12

13

14 15 16

1 2

3

4

2

T5

B18

56 7

8

21

9

43

10

2422 23 25

11 12 13 14 15

26 27

28

16 17

18 19 20 21

33 3429

3230 31

EN(H4DOTC)-93

ENGINE (DIAGNOSTIC)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Step Check Yes No

1 CHECK INPUT SIGNAL FROM ECM.

1) Turn the ignition switch to OFF.

2) Measure the voltage between ECM con-

nector and chassis ground.

Connector & terminal

(B135) No. 2 (+) — Chassis ground (

−

):

Is the voltage more than 8 V? Go to step 2. Go to step 3.

2 CHECK CURRENT DATA.

1) Repair battery short circuit in harness

between ECM and rear oxygen sensor con-

nector.

2) Turn the ignition switch to ON.

3) Read the data of rear oxygen (A/F) sensor

heater current using Subaru Select Monitor or

OBD-II general scan tool.

N

O

TE:

• Subaru Select Monitor

For detailed operation procedure, refer to

“READ CURRENT DATA SHOWN ON DIS-

PLAY FOR ENGINE”. <Ref. to EN(H4DOTC)-

33, Subaru Select Monitor.>

• OBD-II general scan tool

For detailed operation procedures, refer to the

OBD-II General Scan Tool Operation Manual.

Is the current more than 7 A? Replace the ECM.

<Ref. to

FU(H4DOTC)-50,

Engine Control

Module (ECM).>

END.

3 CHECK POOR CONTACT.

Check poor contact in ECM connector.

Is there poor contact in ECM

connector?

Repair the poor

contact in ECM

connector.

END.

EN(H4DOTC)-94

ENGINE (DIAGNOSTIC)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

H: DTC P0068 MANIFOLD PRESSURE SENSOR RANGE/PERFORMANCE

DTC DETECTING CONDITION:

Two consecutive driving cycles with fault

TROUBLE SYMPTOM:

Failure of engine to start

CAUTION:

After repair or replacement of faulty parts, conduct Clear Memory Mode <Ref. to EN(H4DOTC)-47, OP-

ERATION, Clear Memory Mode.> and Inspection Mode <Ref. to EN(H4DOTC)-40, Inspection Mode.>.

WIRING DIAGRAM:

• LHD model

EN-02322

B122

MANIFOLD

ABSOLUTE

PRESSURE

SENSOR

THROTTLE BODY

2

3

1

16

35

22

ECM

B136

E21

E2

F61

2

1

18

20

16

F74

B200

16

21

1 2 3

F61E21

1

2

5 6 7 8

13 14 15 16

9

10 11 12

3 4

17 18 19 20

B136

F2

B122

F74

56

78

21

9

43

10

2422 23 25

11 12 13

14

15

26 27

28

16

17 18 19 20 21

33 34

29

32

30

31 35

34

12 89

10 11

12 13 14 15 16 17 18 19 20 21 22 23 24

56 7

1234

5 6

7 8

1234 56789

10 11 12 13 14 15 16 17 18 19 20

F2

B100

7

EN(H4DOTC)-95

ENGINE (DIAGNOSTIC)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

• RHD model

EN-02323

B122

MANIFOLD

ABSOLUTE

PRESSURE

SENSOR

THROTTLE BODY

3

2

1

35

16

22

ECM

B136

E21

E3

B22

2

1

20

18

16

1 2 3

B122 B22E21

1

2

5 6 7 8

13 14 15 16

9

10 11 12

3 4

17 18 19 20

B136

1234

5 6

7 8

56

78

21

9

43

10

2422 23 25

11 12 13

14

15

26 27

28

16

17 18 19 20 21

33 34

29

32

30

31 35

EN(H4DOTC)-96

ENGINE (DIAGNOSTIC)

Diagnostic Procedure with Diagnostic Trouble Code (DTC)

Step Check Yes No

1 CHECK IDLE SWITCH SIGNAL.

1) Turn the ignition switch to ON.

2) Operate the LED operation mode for

engine using Subaru Select Monitor.

N

O

TE:

• Subaru Select Monitor

For detailed operation procedure, refer to the

“LED OPERATION MODE FOR ENGINE”.

<Ref. to EN(H4DOTC)-33, Subaru Select Mon-

itor.>

Does the LED of {Idle Switch

Signal} come on?

Go to step 2. Check the throttle

position sensor cir-

cuit. <Ref. to

EN(H4DOTC)-

122, DTC P0121

THROTTLE/

PEDAL POSI-

TION SENSOR/

SWITCH “A” CIR-

CUIT RANGE/

PERFORMANCE,

Diagnostic Proce-

dure with Diagnos-

tic Trouble Code

(DTC).>

N

O

TE:

In this case, it is

not necessary to

inspect DTC

P0106.

2 CHECK ANY OTHER DTC ON DISPLAY. Is any other DTC displayed? Check related

DTC.“List of Diag-

nostic Trouble

Code (DTC)” <Ref.

to EN(H4DOTC)-

74, List of Diag-

nostic Trouble

Code (DTC).>

NOTE:

In this case, it is

not necessary to

inspect DTC

P0106.

Go to step 3.

3 CHECK MANIFOLD ABSOLUTE PRESSURE

SENSOR CONDITION.

Is the manifold absolute pres-

sure sensor installation bolt

tightened securely?

Go to step 4. Tighten manifold

absolute pressure

sensor installation

bolt securely.

4 CHECK CONDITION OF THROTTLE BODY. Is the throttle body installation

bolt tightened securely?

Replace the mani-

fold absolute pres-

sure sensor. <Ref.

to FU(H4DOTC)-

36, Manifold Abso-

lute Pressure Sen-

sor.>

Tighten throttle

body installation

bolt securely.

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Subaru 2004 Forester User manual

Subaru 2004 Forester User manual

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