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Home >> Buick >> 2015 >> Verano Leather >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 8 (Engine Controls And Fuel - 2.0L (LHU) - DTC P0010 To P0246) >> Diagnostic Information and Procedures >> DTC P0234 or P0299: Engine Underboost/Engine Overboost >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
  1. Ignition ON, observe the DTC information with a scan tool. Verify DTC P0106, P0107, P0108, P0236, P0237, P0238, P0243, P0245, P0246, P2227, P2228, P2229, or P2230 is not set.
  2. Ignition ON, command the Turbocharger Bypass Solenoid between Active and Inactive with a scan tool. A click should be heard and felt from the solenoid.
  3. Command the Turbocharger Wastegate Solenoid between 15-100 % with a scan tool. A series of clicks should be heard and felt from the solenoid and should increase in frequency as the duty cycle percentage is increased.
  4. Observe the scan tool MAP Sensor, Boost Pressure Sensor and BARO Sensor parameters. Compare the parameters to the Altitude Versus Barometric Pressure table. The parameters should be within 3 kPa (0.4 psi) and should be within the range specified in the table for the current altitude.
  5. Compare the scan tool MAP Sensor parameter to the Boost Pressure Sensor parameter during a WOT acceleration at the time of the 1-2 shift. The readings should be within 20 kPa (2.9 psi).
  6. Operate the vehicle within the Conditions for Running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
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