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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 P0234 or P0299 >> 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. Ignition ON.
  2. Verify DTC P0033, P0034, P0035, P0236, P0237, P0238, P0243, P0245, or P0246 is not set.
    • Go to next step: If none of the DTCs are set 
  3. Verify the scan tool BARO Sensor parameter is within the range specified in the Altitude Versus Barometric Pressure table for the current testing altitude.
    • If the parameter is not within the range specified in the table. 

      Refer to DTC P2227-P2230 .

    • Go to next step: If the parameter is within the range specified in the table. 
  4. Verify the scan tool MAP Sensor and BARO Sensor parameters are within 3 kPa (0.4 psi).
    • If the parameters are not within 3 kPa (0.4 psi). 

      Refer to DTC P0106 .

    • Go to next step: If the parameters are within 3 kPa (0.4 psi). 
  5. Verify the scan tool Boost Pressure Sensor and BARO Sensor parameters are within 3 kPa (0.4 psi).
    • If the parameters are not within 3 kPa (0.4 psi). 

      Refer to DTC P0236 .

    • Go to next step: If the parameters are within 3 kPa (0.4 psi). 
  6. Verify a click is heard or felt from the Q40 Turbocharger Bypass Solenoid Valve when commanding the Turbocharger Bypass Solenoid Valve between Active and Inactive with a scan tool.
    • If a click is not heard or felt 

      Refer to Circuit/System Testing.

    • Go to next step: If a click is heard or felt 
  7. Verify a series of clicks, which increase in frequency, are heard or felt from the Q42 Turbocharger Wastegate Solenoid Valve when commanding the Turbocharger Wastegate Solenoid Valve between 15 - 100 % with a scan tool.
    • If a series of clicks in increasing frequency are not heard or felt 

      Refer to Circuit/System Testing.

    • Go to next step: If a series of clicks in increasing frequency is heard or felt 
  8. 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.
    • If the parameters are not within 20 kPa (2.9 psi) 

      Refer to Circuit/System Testing.

    • Go to next step: If the parameter are within 20 kPa (2.9 psi) 
  9. 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.
  10. 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 
  11. All OK
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