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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 142 (Engine Control System (Basic Inspection) (CUMMINS 5.0L)) >> Basic Inspection >> Def Dosing Unit Override Test >> Work Procedure >> Flow Test

Flow Test

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.
NOTE: Prior to performing this test, if not already directed by a DTC, view and troubleshoot any DTCs.
  1. Turn the ignition switch ON.
  2. Select "DEF Dosing Unit Override Test" in "Active Test" mode of "ENGINE" using CONSULT.
  3. Touch "Start".
  4. Follow the instructions on CONSULT display.
    NOTE: CONSULT will start the test and will inject the DEF for 6 minutes. CONSULT will automatically disable the injector at the end of the test. If the test needs to be stopped before finishing, touch "End".
  5. Perform the test three times. The amount of DEF measured for each test must be within specification.

    DEF dosing valve volume

    : 85-115 mm (2.9-3.9 in)
  6. If the amount of DEF is not within specification, check for leaks, blockages, or restrictions in the DEF line between the DEF dosing unit and the DEF dosing valve.
    NOTE:
    • Do not pour the DEF back into the DEF tank. Dispose of the DEF in accordance with local environmental regulations.
    • The DEF dosing valve may have been plugged by debris. Inspect the DEF dosing unit filter for signs of contamination and debris prior to installing the new DEF dosing valve.
  7. Turn the ignition switch OFF.
  8. Disconnect the electrical and DEF lines.
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