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Home >> Infiniti >> 2019 >> QX50 Essential, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (DTC/Circuit Diagnosis) (11 Of 12) >> DTC/Circuit Diagnosis >> DTC P26AB: Multi-Way Control Valve >> DTC Description >> DTC Confirmation Procedure
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DTC Confirmation Procedure

NOTE: Never refuel before and during the following procedure.
  1. PRECONDITIONING-1 

    If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.

    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. PRECONDITIONING-2 

    SYMBOL With CONSULT

    1. Turn ignition switch ON.
    2. Check the following conditions:

      Ambient temperature

      -10 deg.C (14 deg.F) or more

      A/C switch

      OFF

      Blower fan switch

      OFF
    3. Select "DATA MONITOR" mode of "ENGINE" using CONSULT.
    4. Check the following conditions:

      COOLAN TEMP/S

      [(-10 deg.C) - (+52 deg.C) (14 - 126 deg.F)]

    Is the condition satisfied?

    YES

    GO TO 3.

    NO

    1. Satisfy the condition.
    2. GO TO 3.
  3. PERFORM DTC CONFIRMATION PROCEDURE-1 

    SYMBOL With CONSULT

    1. Start engine.
    2. Drive the vehicle until the following condition is satisfied.
      CAUTION: Always drive vehicle at safe speed.
      1. STEP 1

        Drive the vehicle under the conditions instructed below until the difference between "COOLAN TEMP/S" and "FUEL T/TMP SE" becomes at least 23 deg.C (73 deg.F).

        COOLAN TEMP/S

        68 deg.C (154 deg.F) or less

        FUEL T/TMP SE

        Less than the value calculated by subtracting 28 deg.C (82 deg.F) from "COOLAN TEMP/S".*
        *: Example

        COOLAN TEMP/S

        FUEL T/TMP SE

        65 deg.C (149 deg.F)

        37 deg.C (99 deg.F) or less

        60 deg.C (140 deg.F)

        32 deg.C (89 deg.F) or less
      2. STEP 2

        Drive the vehicle at 60 km/h (37 MPH) or more with the difference between "COOLAN TEMP/S" and "FUEL T/TMP SE" maintained at 28 deg.C (82 deg.F) or more.

        NOTE: Keep the accelerator pedal as steady as possible during cruising.
      3. STEP 3

        Drive the vehicle at 60 km/h (37 MPH) or more until "COOLAN TEMP/S" increases by 6 deg.C (43 deg.F).

        NOTE: Keep the accelerator pedal as steady as possible during cruising.

    Is the condition satisfied?

    YES

    GO TO 4.

    NO

    GO TO 1.

  4. PERFORM DTC CONFIRMATION PROCEDURE-2 

    SYMBOL With CONSULT

    1. Drive the vehicle until the following condition is satisfied.

      COOLAN TEMP/S

      68 deg.C (154 deg.F) or more
      CAUTION: Always drive vehicle at safe speed.
    2. Check 1st trip DTC.

    Is 1st trip DTC detected?

    YES

    Proceed to Diagnosis Procedure .

    NO

    To check malfunction symptom before repair: Refer to Intermittent Incident .

    NO

    Confirmation after repair: INSPECTION END

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