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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 20 (Engine Controls And Fuel - 4.3L (LV1) - Diagnostic Information And Procedures (1 Of 2)) >> Diagnostic Information and Procedures >> DTC P0300-P0306 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Verify the following conditions do not exist :
    • If a condition exists 

      Repair or replace as necessary

    • Go to next step : If no conditions exist 
  2. Ignition/Vehicle - Off
  3. Disconnect the appropriate component : Spark Plug Wire @ Spark Plug
  4. Verify a condition does not exist with the component : Spark Plug Boot - Carbon Tracking/Fluid intrusion/Visible Damage
    • If a condition exists 

      Repair or replace as necessary

    • Go to next step : If no condition exists 
  5. Install J-26792 Ignition Spark Tester @ Spark Plug Wire & Ground
  6. Engine - Running
    7. NOTE:

    An erratic or weak spark is considered a no spark condition.

  7. Verify there is spark at the tool.
    • If there is no spark 
    1. Remove the appropriate component : Spark Plug Wire
    2. Test for 1, 850 to 2, 250 ohms between the test points : Each terminal of the component
    • Go to next step : If there is spark 
  8. Ignition/Vehicle - Off
  9. Remove the appropriate component : Spark Plug
  10. Verify the component specifications are correct : Spark Plug - Gap / Heat Range /Torque Refer to : Ignition System Specifications
    • If a condition exists 

      Repair or replace as necessary

    • Go to next step : If no condition exists 
  11. Verify a condition does not exist with the component : Spark Plug - Carbon Tracking/Fouled/Visible Damage
    • If a condition exists 

      Repair or replace as necessary

    • Go to next step : If no condition exists 
  12. Swap the two components : Spark Plug - The original component that set the DTC & Another known good component from the vehicle
  13. Engine - Running
  14. Verify the scan tool parameter : Cylinder 1 - 6 Current Misfire Counter = Increments - At the original component location the DTC set.
    • If the parameter value does not increment 

      Replace the component : Spark Plug - The original component that set the DTC

    • Go to next step : If the parameter value increments 
  15. Perform the following procedure/test : Fuel Injector Balance - Refer to : Fuel System Diagnosis

    Verify the procedure/test passes.

    • If the procedure/test does not pass 

      Replace the component that failed the test : Q17 Fuel Injector

    • Go to next step : If the procedure/test passes 
  16. Verify the condition does not exist : An engine mechanical condition - Refer to : Symptoms - Engine Mechanical
    • If a condition exists 

      Repair or replace as necessary

    • Go to next step : If no condition exists 
  17. All OK.
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