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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 P0106, P0107, or P0108 >> Circuit/System Verification

Circuit/System Verification

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

If you were sent here from DTC P0068, P0101, P0121, P1101 - Refer to : Circuit/System Testing.

  1. Ignition - On / Vehicle - In Service Mode
  2. Verify DTC P0641, P0651, P0697, P06A3, P06D2 is not set.
    • Go to next step : If none of the DTCs are set 
  3. Verify the scan tool parameter : Throttle Body Idle Air Flow Compensation = Less than 90%
    • Go to next step : If less than 90% 
  4. Perform the scan tool control function : Throttle Sweep - On

    Verify the scan tool parameter : Throttle Position Sensors 1 and 2 = Agree

    • Go to next step : If the specified state 
  5. Determine the current vehicle testing altitude.
  6. Verify the scan tool parameter : MAP Sensor = The value should be within the range listed in the table : Altitude Versus Barometric Pressure
    • If not in the specified range 

      Refer to : Circuit/System Testing

    • Go to next step : If in the specified range 
  7. Engine - Idling - At normal operating temperature.
  8. Accessories - Off
  9. Verify the scan tool parameter : MAP Sensor = 26 to 52 kPa (3.8 to 7.5 PSI)
    • If not between 26 and 52 kPa (3.8 and 7.5 PSI) 

      Refer to : Circuit/System Testing

    • Go to next step : If between 26 and 52 kPa (3.8 and 7.5 PSI) 
  10. Verify the scan tool parameter : MAP Sensor = The value should not spike or drop out.

    Perform the action while monitoring the parameter :

    • Wiggle the harness and connector : B74 Manifold Absolute Pressure Sensor
    • Wiggle the harness and connector : K20 Engine Control Module
    • If the value spikes or drops out 

      Repair as necessary - Wiring / Terminal(s) / Electrical Connector(s)

    • Go to next step : If the value does not spike or drop out 
  11. Perform the following steps :
    1. Observe the scan tool parameter :
      • MAF Sensor
      • Engine Speed
    2. Increase the engine speed slowly to 3, 000 RPM and then back to idle.
    3. Review the scan tool snapshot data.
    4. Verify the scan tool parameter : MAF Sensor

      The value should change smoothly and gradually as the engine speed is increased and decreased.

    • If the value does not change smoothly and gradually 

      Refer to : DTC P0101-P0103 

    • Go to next step : If the value changes smoothly and gradually 
  12. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

    Verify that no DTCs are set.

    • If any DTC is set 

      Refer to : Circuit/System Testing

    • Go to next step : If no DTC is set 
  13. All OK.
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