720° Interval Difference Method
| Diagnostic value | domg 720 = (omg 1 - omg 0) - (omg 7 - omg 6) |
| Misfire judgment | domg 720 > Judgment value → Judge as misfire |
- FTP 1.5 times misfire (Misfire occurrence level which influences exhaust gas)
- Abnormality Judgment
JUDGMENT VALUE (JUDGE THAT MALFUNCTION OCCURS WHEN MISFIRE RATIO IS HIGH IN 1000 ENGINE REVS.)
| Malfunction Criteria | Threshold Value |
|---|---|
| FTP emission judgment value | ≥ 40 x 100/3000% in 1000 revs. |
Time Needed for Diagnosis: 1000 engine revs.
Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.
- Normality Judgment
JUDGMENT VALUE CHART
| Malfunction Criteria | Threshold Value |
|---|---|
| FTP emission judgment value | < 40 x 100/3000% in 1000 revs. |
Time Needed for Diagnosis: 1000 engine revs.
- Catalyst damage misfire (Misfire occurrence level damaging catalyst)
- Abnormality Judgment
JUDGMENT VALUE CHART
| Malfunction Criteria | Threshold Value |
|---|---|
| Catalyst damage misfire judgment value | ≥ Value of Map 3 |
MAP 3 REFERENCE CHART
| 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 | 90 | 90 | 88 | 76 | 68 | 68 | 68 | 68 | 68 | 68 |
| 1000 | 90 | 90 | 88 | 76 | 68 | 68 | 68 | 68 | 68 | 68 | |
| 1500 | 89 | 88 | 80 | 64 | 56 | 56 | 56 | 56 | 56 | 56 | |
| 2000 | 88 | 84 | 64 | 40 | 36 | 35 | 35 | 35 | 35 | 35 | |
| 2500 | 88 | 80 | 56 | 36 | 30 | 30 | 30 | 30 | 30 | 30 | |
| 3000 | 64 | 56 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | |
| 3500 | 50 | 40 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | |
| 4000 | 40 | 38 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | |
| 4500 | 50 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | |
| 5000 | 40 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | |
| 5500 | 40 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | |
| 6000 | 36 | 36 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | |
| 6500 | 32 | 32 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | |
| 7000 | 32 | 32 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | 30 | |
Time Needed for Diagnosis: 200 engine revs.
Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.
- Normality Judgment
JUDGMENT VALUE CHART
| Malfunction Criteria | Threshold Value |
|---|---|
| Catalyst damage misfire judgment value | < Value of Map 2 |
Time Needed for Diagnosis: 200 engine revs.