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Home >> Infiniti >> 2021 >> QX80 Sensory, RWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTCS) (3 Of 5) >> Engine (ECM) >> DTC P0507: ISC System >> DTC Description >> DTC Detection Logic
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DTC Detection Logic

NOTE: If DTC P0507 is displayed with other DTC, first perform the trouble diagnosis for the other DTC.

DTC No.

Trouble diagnosis name

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P0507

ISC SYSTEM

(Idle speed control system RPM higher than expected)

The idle speed is more than the target idle speed by 200 rpm or more.
  • Electric throttle control actuator
  • Intake air leakage
  • PCV system
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