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Home >> Chevrolet >> 2017 >> Spark LT, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 97 (Engine Controls And Fuel - 1.6L (LWC) - DTC P0010 To DTC P0238) >> Diagnostic Information and Procedures >> DTC P0236 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2019 Buick Cascada, 2018 Buick Cascada, and 2017 Buick Cascada. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify that DTC P0641 is not set.
    • Go to next step: If the DTC is not set 
  2. If you were sent here from DTC P0068, P0101, P0106, P0121, or P1101 refer to Circuit/System Testing.
  3. Ignition ON.
  4. Verify the scan tool Throttle Body Idle Airflow Compensation parameter is less than 90%.
    • Go to next step: If less than 90% 
  5. Verify the scan tool Throttle Position Sensors 1 and 2 Agree/Disagree parameter displays Agree while performing the Throttle Sweep Test with a scan tool.
    • Go to next step: If Agree 
  6. Verify the scan tool BARO parameter is within the range specified in the Altitude Versus Barometric Pressure table, for the current vehicle testing altitude.
    • Go to next step: BARO is within range 
  7. Verify the scan tool MAP Sensor pressure and BARO parameters are within 3 kPa (0.4 psi).
    • The parameters are not within 3 kPa (0.4 psi). 

      Refer to DTC P0106 .

    • Go to next step: The parameters are within 3 kPa (0.4 psi). 
  8. Engine idling.
  9. Verify the scan tool MAP Sensor pressure parameter is between 26 - 52 kPa (3.8 - 7.5 psi) and changes with accelerator pedal input.
    • If not between 26 - 52 kPa (3.8 - 7.5 psi) or does not change 

      Refer to DTC P0106 .

    • Go to next step: If between 26 - 52 kPa (3.8 - 7.5 psi) and changes 
  10. Verify the scan tool MAF Sensor g/s parameter changes smoothly and gradually as the engine speed is increased and decreased while performing the actions listed below:
    1. Engine idling
    2. Perform the scan tool snapshot function.
    3. Increase the engine speed slowly to 3, 000 RPM and then back to idle.
    4. Exit from the scan tool snapshot and review the data.
    5. Observe the MAF Sensor parameter frame by frame with a scan tool.
    • The MAF Sensor parameter does not change smoothly and gradually 

      Refer to DTC P0101 .

    • Go to next step: The MAF Sensor parameter changes smoothly and gradually 
  11. Verify the scan tool Boost Pressure Sensor pressure and BARO parameters are within 3 kPa (0.4 psi).
    • The parameters are not within 3 kPa (0.4 psi). 

      Refer to Circuit/System Testing.

    • Go to next step: The parameters are within 3 kPa (0.4 psi). 
  12. Verify the scan tool MAP Sensor parameter and the Boost Pressure Sensor parameter are within 20 kPa (2.9 psi) during a WOT acceleration at the time of the 1-2 shift.
    • The parameters are not within 20 kPa (2.9 psi) 

      Refer to Circuit/System Testing.

    • Go to next step: The parameters are within 20 kPa (2.9 psi) 
  13. 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.
  14. Verify a DTC does not set.
    • If a DTC sets 

      Refer to Circuit/System Testing.

    • Go to next step: If a DTC does not set 
  15. All OK.
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