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Home >> Chevrolet >> 2021 >> Trailblazer RS, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Engine Controls And Fuel - 1.0L (L4B L4F L4G LIJ) Or 1.2L (L4H L4K LIF LIH) - 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. 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. Determine the current vehicle testing altitude.
  4. 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 
  5. Engine - Idling - At normal operating temperature.
  6. Accessories - Off
  7. Verify the scan tool parameter: MAP Sensor = 20 to 300 kPa (2.9 to 43.5 PSI)
    • If not between 20 and 300 kPa (2.9 and 43.5 PSI) 

      Refer to Circuit/System Testing

    • Go to next step: If between 20 and 300 kPa (2.9 and 43.5 PSI) 
  8. 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 
  9. Perform the following steps:
    1. Observe the scan tool parameter:
      • MAF Sensor
      • Engine Speed
    2. Increase the engine speed slowly to 3000 RPM and then back to idle.
    3. Review Stored Data - Freeze Frame/Failure Records
    4. Verify the scan tool parameter: MAF Sensor

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

    • Go to next step: If the value changes smoothly and gradually 
  10. 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 
  11. All OK.
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