Subaru Legacy IV (2008 year). Service 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)
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