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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Engine Controls And Fuel - 2.8L (LWN) Diesel - Diagnostic Information And Procedures (3 Of 3)) >> Diagnostic Information and Procedures >> Fuel System Diagnosis - High Pressure Side >> Circuit/System Verification

Circuit/System Verification

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  1. Engine - Cranking - For 10 s

    Verify the function : Engine = Running

    • If the function does not work 

      Refer to : Circuit/System Testing - Test 1

    • Go to next step : If the function works 
  2. Ignition/Vehicle - Off
  3. Verify the condition does not exist : Fuel - Contaminated/Poor Quality - Refer to : Contaminants-in-Fuel Diagnosis 
    • If a condition exists 

      Repair or replace as necessary

    • Go to next step : If no condition exists 
  4. Engine - Running

    Verify the following conditions do not exist :

    • Engine - Misfire/Stalling
    • Engine Power - Low
    • Exhaust - Excessive Smoke
    • Idle Speed - Unstable
    • If a condition exists 

      Refer to : Circuit/System Testing - Test 2

    • Go to next step : If no condition exists 
  5. Refer to : Symptoms - Engine Controls