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On Board Diagnosis Logic

WARNING: This page is about a different car, the 2008 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.
DTC DETECTING CONDITION AND POSSIBLE CAUSE

DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0506
0506
Idle speed control system RPM lower than expected The idle speed is less than the target idle speed by 100 rpm or more.
  • Electric throttle control actuator
  • Intake air leak