LEMON Manuals: Even more car manuals for everyone
Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 211 (Engine Control System (DTC/Circuit Diagnosis) (CUMMINS 5.0L) (1 Of 6)) >> DTC/Circuit Diagnosis >> DTC P0128-00: Thermostat Function >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2018 Nissan Titan XD. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK DTC PRIORITY 
    1. Turn ignition switch ON.
    2. Connect CONSULT and check for ENGINE diagnostic trouble codes.
    3. Check for DTCs P0116-00, P0117-00 or P0118-00 being past on the CONSULT screen.

    Is applicable DTC detected?

    YES

    Refer to DTC Index .

    NO

    GO TO 2 .

  2. PERFORM ACTIVE TEST 
    1. Start the engine and run at low idle.
    2. Perform the Fan Override Test Active Test item on the CONSULT screen.
    3. Verify that the fan operates correctly, is not stuck, and turns ON and OFF as commanded.

    Is the fan clutch assembly operating correctly?

    YES

    GO TO 3.

    NO

    Troubleshoot and repair the cause of the malfunctioning engine fan operation. Inspect engine fan wiring for short or open circuits. Check engine fan switches for proper operation.

  3. CHECK COOLANT LEVEL 

    Check coolant level.

    Is coolant level low?

    YES

    Check the cause of low coolant level. Refer to Coolant Loss - External .

    NO

    GO TO 4 .

  4. CHECK THERMOSTAT 
    1. Turn ignition switch OFF.
    2. Check for a leaking or stuck open thermostat.

    Is the thermostat operating correctly?

    YES

    Replace the engine coolant temperature sensor. Refer to Removal and Installation .

    NO

    Replace the thermostat. Refer to Removal and Installation .

scientia non olet · About LEMON Manuals