Subaru Impreza 3 / Impreza WRX / Impreza WRX STI. Service manual — part 342
GD(H4DOTC)-120
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
180° Interval Difference Method
360° Interval Difference Method
Diagnostic value
domg 180 = (omg 1 – omg 0) – (omg 5 – omg 1)/4
Judge as a misfire in the following cases.
• domg 180 > judgment value of positive side
• domg 180 ≤ judgment value of negative side
(Diagnostic value before 180° CA)
Diagnostic value
domg 360 = (omg 1 – omg 0) – (omg 3 – omg 2)
Misfire judgment
domg 360 > Judgment value → Judge as misfire
Judged as misfire.
Threshold valve (positive number)
Threshold valve (negative number)
domg180
domg180
EN-02877
Judged as misfire.
Threshold valve
domg360
domg360
EN-03273
GD(H4DOTC)-121
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
720° Interval Difference Method
• FTP 1.5 times misfire (Misfire occurrence level which influences exhaust gas)
•
Abnormality Judgment
Time Needed for Diagnosis: 1000 engine revs.
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cy-
cles.
•
Normality Judgment
Time Needed for Diagnosis: 1000 engine revs.
Diagnostic value
domg 720 = (omg 1 – omg 0) – (omg 5 – omg 4)
Misfire judgment
domg 720 > Judgment value → Judge as misfire
Judgment Value (Judge that malfunction occurs when the misfire ratio is high in 1000 engine revs.)
Malfunction Criteria
Threshold Value
FTP emission diagnostic value
≥ 17 × 100/2000% in 1000 revs.
Judgment Value
Malfunction Criteria
Threshold Value
FTP emission diagnostic value
< 17 × 100/2000% in 1000 revs.
Judged as misfire.
Threshold valve
domg720
domg720
EN-03274
GD(H4DOTC)-122
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
• Catalyst damage misfire (Misfire occurrence level damaging catalyst)
•
Abnormality Judgment
Map 3 (Models without SI-DRIVE)
Map 3 (Models with SI-DRIVE)
Time Needed for Diagnosis: 200 engine revs.
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.
Judgment Value
Malfunction Criteria
Threshold Value
Catalyst damage misfire diagnostic
value
≥ Value from Map 3
Intake air (g(oz)/rev)
0.2
(0.01)
0.4
(0.01)
0.6
(0.02)
0.8
(0.03)
1
(0.04)
1.2
(0.04)
1.4
(0.05)
1.6
(0.06)
1.8
(0.06)
2
(0.07)
Engine
speed
(rpm)
700
100
100
100
100
100
90
90
90
90
90
1000
100
100
100
100
92
85
85
85
85
85
1500
100
100
100
90
85
85
85
72
72
72
2000
100
90
90
73
58
43
40
36
32
20
2500
100
87
57
45
39
36
34
32
30
20
3000
100
87
58
39
36
36
32
30
28
20
3500
98
74
43
27
23
22
20
20
20
20
4000
69
61
40
27
22
20
20
20
20
20
4500
60
55
34
25
20
20
20
20
20
20
5000
55
55
34
23
20
20
20
20
20
20
5500
54
54
33
22
20
20
20
20
20
20
6000
52
52
32
21
20
20
20
20
20
20
6500
50
50
30
20
20
20
20
20
20
20
6700
50
50
30
20
20
20
20
20
20
20
Intake air (g(oz)/rev)
0.2
(0.01)
0.4
(0.01)
0.6
(0.02)
0.8
(0.03)
1
(0.04)
1.2
(0.04)
1.4
(0.05)
1.6
(0.06)
1.8
(0.06)
2
(0.07)
Engine
speed
(rpm)
700
148
128
116
106
100
90
90
90
90
90
1000
148
128
114
104
92
85
85
85
85
85
1500
140
118
102
90
85
85
85
72
72
72
2000
128
90
90
73
58
43
40
36
32
20
2500
116
87
57
45
39
36
34
32
30
20
3000
108
87
58
39
36
36
32
30
28
20
3500
74
74
43
27
23
22
20
20
20
20
4000
61
61
40
27
22
20
20
20
20
20
4500
55
55
34
25
20
20
20
20
20
20
5000
55
55
34
23
20
20
20
20
20
20
5500
54
54
33
22
20
20
20
20
20
20
6000
52
52
32
21
20
20
20
20
20
20
6500
50
50
30
20
20
20
20
20
20
20
6700
50
50
30
20
20
20
20
20
20
20
GD(H4DOTC)-123
Diagnostic Trouble Code (DTC) Detecting Criteria
GENERAL DESCRIPTION
•
Normality Judgment
Time Needed for Diagnosis: 200 engine revs.
BO:DTC P0302 CYLINDER 2 MISFIRE DETECTED
1. OUTLINE OF DIAGNOSIS
NOTE:
For the detection standard, refer to DTC P0301. <Ref. to GD(H4DOTC)-114, DTC P0301 CYLINDER 1 MIS-
FIRE DETECTED, Diagnostic Trouble Code (DTC) Detecting Criteria.>
BP:DTC P0303 CYLINDER 3 MISFIRE DETECTED
1. OUTLINE OF DIAGNOSIS
NOTE:
For the detection standard, refer to DTC P0301. <Ref. to GD(H4DOTC)-114, DTC P0301 CYLINDER 1 MIS-
FIRE DETECTED, Diagnostic Trouble Code (DTC) Detecting Criteria.>
BQ:DTC P0304 CYLINDER 4 MISFIRE DETECTED
1. OUTLINE OF DIAGNOSIS
NOTE:
For the detection standard, refer to DTC P0301. <Ref. to GD(H4DOTC)-114, DTC P0301 CYLINDER 1 MIS-
FIRE DETECTED, Diagnostic Trouble Code (DTC) Detecting Criteria.>
Judgment Value
Malfunction Criteria
Threshold Value
Catalyst damage misfire diagnostic value
< Value of Map 3
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