Subaru Legacy IV (2008 year). Manual - part 407

GD(H4DOTC)-78

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

AQ:DTC P0245 TURBO/SUPER CHARGER WASTEGATE SOLENOID “A” LOW

1. OUTLINE OF DIAGNOSIS

Detect open or short circuit of the wastegate control solenoid valve.
Judge as NG when the terminal output voltage remains Low during outputting the duty signal.

2. COMPONENT DESCRIPTION

3. ENABLE CONDITION

4. GENERAL DRIVING CYCLE

Perform the diagnosis continuously after starting the engine.

5. DIAGNOSTIC METHOD

Abnormality Judgement

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Time Needed for Diagnosis: 4 ms × 160 time(s)
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

Normality Judgement

Judge as OK and clear the NG if the continuous time while the following conditions are established is more
than the predetermined time.

Time Needed for Diagnosis: Less than 1 second

(1)

Coil

Secondary Parameters

Enable Conditions

Battery voltage

t 10.9 V

Elapsed time after starting the engine

t 1 second

Judgement Value

Malfunction Criteria

Threshold Value

Terminal output voltage

Low

Duty ratio of wastegate control

< 75%

Judgement Value

Malfunction Criteria

Threshold Value

Terminal output voltage

High

EN-01772

(1)

GD(H4DOTC)-79

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

AR:DTC P0246 TURBO/SUPER CHARGER WASTEGATE SOLENOID “A” HIGH

1. OUTLINE OF DIAGNOSIS

Detect open or short circuit of the wastegate control solenoid valve.
Judge as NG when the terminal output voltage remains Low or High during outputting the duty signal.

2. COMPONENT DESCRIPTION

3. ENABLE CONDITION

4. GENERAL DRIVING CYCLE

Perform the diagnosis continuously after starting the engine.

5. DIAGNOSTIC METHOD

Abnormality Judgement

If the duration of time while the following conditions are met is longer than the time indicated, judge as NG.

Time Needed for Diagnosis: 4 ms × 160 time(s)
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

Normality Judgement

Judge as OK and clear the NG if the continuous time while the following conditions are established is more
than the predetermined time.

Time Needed for Diagnosis: Less than 1 second

(1)

Coil

Secondary Parameters

Enable Conditions

Battery voltage

t 10.9 V

Elapsed time after starting the engine

t 1 second

Judgement Value

Malfunction Criteria

Threshold Value

Terminal output voltage

High

Duty ratio of wastegate control

t 25%

Judgement Value

Malfunction Criteria

Threshold Value

Terminal output voltage

Low

EN-01772

(1)

GD(H4DOTC)-80

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

AS:DTC P0301 CYLINDER 1 MISFIRE DETECTED

1. OUTLINE OF DIAGNOSIS

Detect the presence of misfire occurrence. (Revolution fluctuation method)
Monitoring Misfire which influences exhaust deterioration (1.5 times of FTP) and catalyst damage is made
obligatory by the law. Misfire affecting these two has two patterns below. :
• Intermittent misfire (The same cylinder misfires in random, or different cylinders misfire in random.): FTP
1.5 times misfire
• Every time misfire (The same cylinder misfires every time.): FTP 1.5 times misfire, Catalyst damage mis-
fire
The following detecting methods are adopted for these detection.
1) Intermittent misfire: FTP 1.5 times misfire
• 180° Interval Difference Method (MT: 1,800 rpm or less, AT: None)
• 360° Interval Difference Method (whole range)
• 720° Interval Difference Method (3,000 rpm or more)
2) Misfire every time: FTP 1.5 times misfire, Catalyst damage misfire
• 360° Interval Difference Method

2. ENABLE CONDITION

Secondary Parameters

Enable Conditions

All secondary parameters enable condi-
tions

t 1024 ms

Intake manifold pressure change at 
180°CA

< Value of Map 1

Throttle position change during 16 milli-
seconds

< 14 °

Fuel shut-off function

Not in operation

Fuel level

t 9.6 

2 (2.54 US gal, 

2.11 Imp gal)

Vehicle dynamic control or AT torque 
control

Not in operation

Evaporative system leak check

Not in operation

Engine speed

500 rpm — 6500 rpm

Intake manifold pressure

t Value from Map 2

Battery voltage

t 8 V

Fuel parameter determination

Not extremely low vol-
atility

Elapsed time after starting the engine

t 0 ms

Engine load change during 32 millisec-
onds

< 1000 rpm

GD(H4DOTC)-81

Diagnostic Trouble Code (DTC) Detecting Criteria

GENERAL DESCRIPTION

Map1
• AT model

• MT  model

Map2
• AT model (Tumble generator valve open)

• AT model (Tumble generator valve closed)

• MT model (Tumble generator valve open)

• MT model (Tumble generator valve closed)

rpm

700

1000

1500

2000

2500

3000

3500

4000

4500

5000

5500

6000

6500

6700

kPa 
(mmHg, 
inHg)

26.7 

(200,

7.9)

26.7

(200,

7.9)

26.7 

(200,

7.9)

26.7

(200, 

7.9)

26.7 

(200, 

7.9)

26.7 

(200, 

7.9)

26.7

(200, 

7.9)

26.7 

(200, 

7.9)

26.7

(200, 

7.9)

26.7 

(200,

7.9)

26.7

(200,

7.9)

26.7 

(200,

7.9)

26.7

(200, 

7.9)

26.7 

(200, 

7.9)

rpm

700

1000

1500

2000

2500

3000

3500

4000

4500

5000

5500

6000

6500

6700

kPa 
(mmHg, 
inHg)

13.3 

(100,

3.9)

13.3

(100,

3.9)

13.3 

(100,

3.9)

13.3

(100, 

3.9)

13.3 

(100, 

3.9)

13.3 

(100, 

3.9)

13.3

(100, 

3.9)

13.3 

(100, 

3.9)

13.3

(100, 

3.9)

13.3 

(100,

3.9)

13.3

(100,

3.9)

13.3 

(100,

3.9)

13.3

(100, 

3.9)

13.3 

(100, 

3.9)

rpm

700

1000

1500

2000

2500

3000

3500

4000

4500

5000

5500

6000

6500

6700

kPa 
(mmHg, 
inHg)

29.3 

(220,

8.7)

26.7

(200,

7.9)

26.7 

(200,

7.9)

26.7

(200, 

7.9)

27.3 

(205, 

8.1)

28

(210, 

8.3)

29.5

(221.5, 

8.7)

31.3 

(235, 

9.3)

32.7

(245.5, 

9.7)

34.1 

(256,
10.1)

38.2

(286.5,

11.3)

44

(330,

13)

49.5

(371.5,

14.6)

53.3 

(400, 
15.7)

rpm

700

1000

1500

2000

2500

3000

3500

4000

4500

5000

5500

6000

6500

6700

kPa 
(mmHg, 
inHg)

29.3 

(220,

8.7)

26.7

(200,

7.9)

26.7 

(200,

7.9)

26.7

(200, 

7.9)

27.3 

(205, 

8.1)

28

(210, 

8.3)

29.5

(221.5, 

8.7)

31.3 

(235, 

9.3)

32.7

(245.5, 

9.7)

34.1 

(256,
10.1)

38.2

(286.5,

11.3)

44

(330,

13)

49.5

(371.5,

14.6)

53.3 

(400, 
15.7)

Vehicle speed < 64 km/h (39.8 MPH)

rpm

700

1000

1500

2000

2500

3000

3500

4000

4500

5000

5500

6000

6500

6700

kPa 
(mmHg, 
inHg)

27.3 

(205,

8.1)

23.3

(175,

6.9)

23.6 

(177,

7)

23.3

(175, 

6.9)

24 

(180, 

7.1)

24.4 

(183, 

7.2)

28.8

(216, 

8.5)

30

(225, 

8.9)

31.6

(237, 

9.3)

32.5 

(244,

9.6)

37.1

(278,
10.9)

41.9 

(314,
12.4)

46.9

(352, 
13.9)

51.1 

(383, 
15.1)

Vehicle speed 

t 68 km/h (42.3 MPH)

rpm

700

1000

1500

2000

2500

3000

3500

4000

4500

5000

5500

6000

6500

6700

kPa 
(mmHg, 
inHg)

25.1 

(188,

7.4)

24.8

(186,

7.3)

25.6 

(192,

7.6)

40 

(300, 
11.8)

40.8 

(306, 

12)

42.1 

(316, 
12.4)

44 

(330, 

13)

44.5 

(334, 
13.1)

47.3

(355, 

14)

54.7 

(410,
16.1)

54.7

(410,
16.1)

54.7 

(410,
16.1)

54.7

(410, 
16.1)

54.7 

(410, 
16.1)

Vehicle speed < 64 km/h (39.8 MPH)

rpm

700

1000

1500

2000

2500

3000

3500

4000

4500

5000

5500

6000

6500

6700

kPa 
(mmHg, 
inHg)

27.3 

(205,

8.1)

23.3

(175,

6.9)

23.6 

(177,

7)

23.3

(175, 

6.9)

24 

(180, 

7.1)

24.4 

(183, 

7.2)

28.8

(216, 

8.5)

30

(225, 

8.9)

31.6

(237, 

9.3)

32.5 

(244,

9.6)

37.1

(278,
10.9)

41.9 

(314,
12.4)

46.9

(352, 
13.9)

51.1 

(383, 
15.1)

Vehicle speed 

t 68 km/h (42.3 MPH)

rpm

700

1000

1500

2000

2500

3000

3500

4000

4500

5000

5500

6000

6500

6700

kPa 
(mmHg, 
inHg)

25.1 

(188,

7.4)

24.8

(186,

7.3)

25.6 

(192,

7.6)

40 

(300, 
11.8)

40.8 

(306, 

12)

42.1 

(316, 
12.4)

44 

(330, 

13)

44.5 

(334, 
13.1)

47.3

(355, 

14)

54.7 

(410,
16.1)

54.7

(410,
16.1)

54.7 

(410,
16.1)

54.7

(410, 
16.1)

54.7 

(410, 
16.1)