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Home >> Chevrolet >> 2015 >> Cruze LT, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 89 (Engine Controls And Fuel - 1.4L (LUJ LUV) - DTC P0010 To DTC P0246) >> Diagnostic Information and Procedures >> DTC P0234 or P0299: Engine Overboost >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2015 Chevrolet Trax and 2015 Buick Encore. 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, P0246 or, P2261 is not set.
    • 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 .

    • 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 .

    • 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 .

    • If the parameters are within 3 kPa (0.4 psi). 
  6. Engine running, verify the wastegate actuator rod moves when increasing engine speed to wide open throttle (WOT) and abruptly back to idle.
    • If the rod does not move 

      Refer to Circuit/System Testing.

    • If the rod moves 
  7. Ignition On, engine Off, verify a click is heard or felt from the Q40 Turbocharger Bypass Solenoid Valve when commanding the Turbocharger Bypass Solenoid Valve On and Off with a scan tool.
    • If a click is not heard or felt 

      Refer to Circuit/System Testing.

    • If a click is heard or felt 
  8. 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.

    • If a series of clicks in increasing frequency is heard or felt 
  9. 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 not within 20 kPa (2.9 psi) 

      Refer to Circuit/System Testing.

    • If within 20 kPa (2.9 psi) 
  10. Verify the scan tool Desired Boost Pressure parameter and the Boost Pressure Sensor parameter are within 15.2 kPa (2.2 psi) during a WOT acceleration at the time of the 1-2 shift.
    • If the not within 15.2 kPa (2.2 psi) 

      Refer to Circuit/System Testing.

    • If within 15.2 kPa (2.2 psi) 
  11. 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.
  12. Verify a DTC does not set.
    • If a DTC sets 

      Refer to Circuit/System Testing

    • If a DTC does not set 
  13. All OK
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