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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 502 (Engine Control System (DTC/Circuit Diagnosis) (1 Of 3)) >> DTC/Circuit Diagnosis >> DTC P0128: Thermostat Function >> DTC Confirmation Procedure

DTC Confirmation Procedure

WARNING: This page is about a different car, the 2019 Nissan NV3500 HD, 2019 Nissan NV2500 HD, and 2019 Nissan NV1500. However, it is still accessible from the selected car via links, so may be relevant.
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 - 56 deg.C (14 - 133 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 25 deg.C (45 deg.F).

        COOLAN TEMP/S

        75 deg.C (167 deg.F) or less

        FUEL T/TMP SE

        Less than the value calculated by subtracting 25 deg.C (45 deg.F) from "COOLAN TEMP/S".*
        *: Example

        COOLAN TEMP/S

        FUEL T/TMP SE

        70 deg.C (158 deg.F)

        47 deg.C (117 deg.F) or less

        65 deg.C (149 deg.F)

        42 deg.C (108 deg.F) or less

        60 deg.C (140 deg.F)

        37 deg.C (99 deg.F) or less
      2. STEP 2

        Drive the vehicle at 50 km/h (32 MPH) or more with the difference between "COOLAN TEMP/S" and "FUEL T/TMP SE" maintained at 25 deg.C (45 deg.F) or more.

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

        Drive the vehicle at 50 km/h (32 MPH) or more until "COOLAN TEMP/S" increases by 6 deg.C (11 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

      75 deg.C (167 deg.F) or more
      CAUTION: Always drive vehicle at safe speed.
    2. Check 1st trip DTC.

    Is 1st trip DTC detected?

    YES

    Proceed to DTC Diagnosis Procedure .

    NO

    INSPECTION END

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