| DTC Strategy |
- Calculation of engine roughness
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- Faulty spark plugs, high-tension lead, or Ignition coil
- Incorrect valve timing
- Uneven compression
- Air leakage
- Improper Fuel pressure or dirty fuel.
- Blocked/Leaking injectors
- Leakage between cooling system and cylinder
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| Enable Conditions |
- 170 < Mass air flow(mg/rev.) < 460
- 512 < Engine speed(RPM) < 6500
- 40 < MAF gradient(mg/rev/Seg.) < 400
- 140 < Throttle gradient(TPS/sec.) < 200
- Coolant temperature > 20°C (-4°F) if Start temperature < -7°C (19.4°F)
- No rough road
- No relevant failure
- 11V< Battery voltage< 16V
- Fuel cut off not active
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| Threshold Value |
Case1) |
- Misfire = 12-50% within 200 rev.
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| Case2) |
- Misfire > 2% within 1000 revolutions for SULEV
- Misfire > 1.3% within 1000 revolutions for ULEV
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| Diagnosis Time |
Case1) |
- 200 revolution or 3*200 revolution
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| Case2) |
- 1000 revolution or 4*1000 revolution
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