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Home >> Nissan-Datsun >> 2011 >> Quest SL >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0451 To P1226 >> DTC P0506: ISC System >> Diagnosis Procedure
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Diagnosis Procedure

  1. CHECK INTAKE AIR LEAKAGE
    1. Start engine and let it idle.
    2. Listen for an intake air leakage after the mass air flow sensor.

      Is intake air leakage detected? 

      YES: Discover air leakage location and repair.

      NO: Replace ECM. Refer to "REMOVAL AND INSTALLATION ".

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