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Home >> Kia >> 2016 >> Optima SX Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 108 (Engine Control System Diagnosis - 1.6L (2 Of 3) - Optima (Except HEV)) >> DTC P0506: Idle Air Control System-RPM Lower Than Expected >> DTC Information >> DTC Detecting Condition

DTC Information: DTC Detecting Condition

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Item Detecting Condition Possible Cause
DTC Strategy
  • Engine speed is below the target while ISC torque is around the maximum
  1. Intake system restriction
  2. Vacuum leaks
  3. Exhaust restriction
  4. Engine mechanical concern
  5. Sludged throttle body
  6. ETC
  7. ECM
Enable Conditions
  • Vehicle speed 0km (0mph)
  • ECT greater than 60°C (140°F)
  • Intake air temperature greater than -10.5°C (13.1°F)
  • Accel. Pedal 0%
  • BARO greater than 74.5kpa (0.74bar/10.80psi)
Threshold Value
  • Difference of Desired engine speed and Actual engine speed greater than 100RPM
  • Difference of Max. idle torque and Actual idle torque less than 10Nm
Diagnostic Time
  • 8s
MIL ON Condition
  • 3 driving cycles