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Home >> Chevrolet >> 2021 >> Blazer RS, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Controls And Fuel - 2.0L (LSY) - 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.
  1. If you were sent here from DTC P0101, P0121, P1101 - Refer to: Circuit/System Testing.
  2. Ignition - On/Vehicle - In Service Mode
  3. Verify DTC P0641, P0651, P0697, P06A3 is not set.
    • Go to next step: If none of the DTCs are set 
  4. Verify the scan tool parameter: Throttle Body Idle Air Flow Compensation = Less than 90%
    • Go to next step: If less than 90% 
  5. 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 
  6. Verify the scan tool parameter: Boost Pressure Sensor = The value should be within the range listed in the table: Altitude Versus Barometric Pressure
    • Go to next step: If in the specified range 
  7. Engine - Running
  8. Verify the scan tool parameter: Boost Pressure Sensor = The value should change with accelerator pedal input.
    • Go to next step: If in the specified range 
  9. Verify the scan tool parameter: MAP Sensor = 26 to 52 kPa (3.8 to 7.5 PSI) - The value should change with accelerator pedal input.
    • 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 7.6 PSI) and changes 
  10. Observe the scan tool parameter: MAF Sensor & Engine Speed - Increase the engine speed slowly to 3000 RPM and then back to idle.

    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 

    • Go to next step: If the value changes smoothly and gradually 
  11. 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: B65 Intake Manifold Pressure and Air Temperature 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 
  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 the DTC does not set.

    • If the DTC sets 

      Refer to: Circuit/System Testing

    • Go to next step: If the DTC is not set 
  13. All OK.
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