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DTC Detecting Condition and Trouble Area

DTC DETECTING CONDITION AND TROUBLE AREA

DTC detecting condition Trouble area
If either of the following condition is fulfilled when engine started:
  • Difference between command duty of IAC and reference duty of IAC is more than +35% or less than -20% for 10 sec. while engine is running at idle speed with cold start condition.
  • Command duty of IAC is higher than 99% or lower than 1% while engine is running at idle speed with cold start condition.

    (2 driving cycle detection logic)
  • Air intake system
  • PCV valve and/or hose
  • Exhaust system (clogged WU-TWC)
  • Electric throttle body assembly and/or its circuit
  • ECT sensor and/or its circuit
  • Ignition system
  • EVAP system
  • Engine compression
  • Engine vacuum
  • Valve lash and/or valve timing
  • ECM
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