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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 307 (Engine Control System (DTC/Circuit Diagnosis) (4.0L) (1 Of 4)) >> DTC/Circuit Diagnosis >> DTC P0128: Thermostat Function >> DTC Confirmation Procedure

DTC Confirmation Procedure

WARNING: This page is about a different car, the 2018 Nissan NV3500 HD, 2018 Nissan NV2500 HD, and 2018 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°C (14°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°C - 56°C (14 - 133°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°C (45°F).

        COOLAN TEMP/S

        75°C (167°F) or less

        FUEL T/TMP SE

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

        COOLAN TEMP/S

        FUEL T/TMP SE

        70°C (158°F)

        47°C (117°F) or less

        65°C (149°F)

        42°C (108°F) or less

        60°C (140°F)

        37°C (99°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°C (45°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°C (11°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°C (167°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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