Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Infiniti >> 2012 >> QX56 AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTCS P0137 To P0463 >> DTC P0448: EVAP Canister Vent Control Valve >> DTC Logic >> DTC Confirmation Procedure

DTC Confirmation Procedure

  1. PRECONDITIONING
    1. Turn ignition switch OFF and wait at least 10 seconds.
    2. Turn ignition switch ON.
    3. Turn ignition switch OFF and wait at least 10 seconds.

    : GO TO 2.

  2. PERFORM DTC CONFIRMATION PROCEDURE
    1. Turn ignition switch ON and wait at least 5 seconds.
    2. Turn ignition switch OFF and wait at least 10 seconds.
    3. Start engine and let it idle for at least 1 minute.
    4. Repeat next procedures 3 times.
      • Increase the engine speed up to between 3, 000 and 3, 500 rpm and maintain that speed for 2 minutes and 50 seconds to 3 minutes.

        Do not exceed 3 minutes. 

      • Fully released accelerator pedal and keep engine idle for approximately 5 seconds.
    5. Repeat next procedure 20 times.
      • Quickly increase the engine speed up to between 4, 000 and 4, 500 rpm and maintain that speed for 25 to 30 seconds.
      • Fully released accelerator pedal and keep engine idle for at least 35 seconds.
      Fig 1: Engine Speed Graph
      G08260227Courtesy of NISSAN NORTH AMERICA, INC.
    6. Check 1st trip DTC.

    Is 1st trip DTC detected? 

    YES: Proceed to "DIAGNOSIS PROCEDURE ".

    NO: INSPECTION END