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Home >> Chevrolet >> 2023 >> Tahoe SSV >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Controls And Fuel - 3.0L (Lm2) Diesel - Diagnostic Information And Procedures (5 Of 5)) >> Diagnostic Information and Procedures >> Reductant Fluid Injector Quantity Test >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
    WARNING:

    Diesel Exhaust Fluid (DEF) is corrosive. Do not allow it to come in contact with your skin, eyes, or the finished surfaces of the vehicle. If exposed, it may cause skin and eye irritation. Wear skin and eye protection when handling. Inhalation may cause irritation to the upper respiratory tract. Store in a cool, well-ventilated area. For more safety information, see the label of the Diesel Exhaust Fluid container. Failure to follow this procedure may result in injury and/or vehicle damage. 

    NOTE:
    • Do not perform this diagnostic procedure unless you were sent here from another diagnostic procedure.
    • Do not perform the Reductant Quantity Test if the diesel exhaust fluid (DEF) temperature is colder than -7°C (19.5°F).
    • The Reductant Quantity Test may need to be run multiple times to dissolve crystallized reductant and to restore proper flow pattern.
    • The NOx Catalyst Reductant-Load Adaptive Value can affect the quantity of reductant in the Reductant Injection Quantity Test. To reset this value and ensure the accuracy of the test, the scan tool NOx Catalyst Reductant Loading Reset must be performed prior to performing the test.
    • Once the injector begins cycling, the Reductant Quantity Test takes approximately 5 minutes to run and the ECM will end the test after approximately 325 s.
  1. Perform the scan tool Nitrogen Oxides Catalytic Converter Reductant Loading Reset .
    2. NOTE:

    The gasket for the Q61 Emission Reduction Fluid Injector must be replaced when the injector is removed from the exhaust pipe.

  2. Remove the Q61 Emission Reduction Fluid Injector from the exhaust leaving the reductant line connected.
  3. Position the Q61 Emission Reduction Fluid Injector nozzle towards one of the graduated scale container from the J 45873. Command the Reductant Injection Quantity Test ON with a scan tool. Observe the injector spray pattern. 3 individual streams and atomization or mist of reductant should be observed.
    • If the function does not perform as specified 

      Inspect the Q61 Emission Reduction Fluid Injector lines for damage, restrictions, or blockage.

    • If a condition is found, repair as necessary
    • If no condition is found, replace the Q61 Emission Reduction Fluid Injector
    • Go to next step: If the function performs as specified 
  4. When the test completes, verify 45 - 55 ml of fluid has flowed.
    • If not between 45 - 55 ml 
    1. Disconnect the Q61 Emission Reduction Fluid Injector from the supply line.
    2. Position the Q61 Emission Reduction Fluid Injector supply line towards the graduated scale container.
      3. NOTE:

      The Reductant Injection Quantity Test runs for approximately 5 minutes when turned on, and cannot be turned off with the scan tool. The step below is performed using the scan tool Reductant System Leak Test function.

    3. Command the Reductant System Leak Test ON with a scan tool.
    4. Command the Reductant System Leak Test Off when 60 ml has flowed.
    5. Verify that 60 ml has flowed within 1 minute.
      • If less than 60 ml 
    6. Inspect the Q61 Reductant Injector and supply line for damage, restrictions, or blockage.
      • If a condition is found, repair or replace as necessary.
      • If no condition is found, replace the A38 Reductant Pump and Sensor Assembly.
      • Go to next step: If 60 ml or greater 
    7. Replace the Q61 Reductant Injector.
    • Go to next step: If between 45 - 55 ml 
  5. Return to referring document.
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