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Home >> Chevrolet >> 2018 >> Equinox L >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 4 (Engine Controls And Fuel - 2.0L (LTG) - Diagnostic Information And Procedures (P0010 - P0333)) >> Diagnostic Information And Procedures >> DTC P0234 Or P0299: Engine Overboost Or Underboost >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
  1. Ignition On.
  2. Verify DTC P0106, P0107, P0108, P0236, P0237, P0238, P0243, P0245, P0246, P2227, P2228, P2229 or P2230 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.
    • Go to next step: If within the range. 
  4. Verify the scan tool MAP Sensor and BARO Sensor parameters are within 3 kPa (0.4 psi).
    • If not within 3 kPa (0.4 psi). 

      Refer to DTC P0106 .

    • Go to next step: If 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 not within 3 kPa (0.4 psi). 

      Refer to DTC P0236 .

    • Go to next step: If 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.
    • Go to next step: If a click is heard or felt 
  7. Verify the parameters listed below do not display Malfunction when commanding the Turbocharger Bypass Solenoid Valve between Active and Inactive with a scan tool.
    • Turbocharger Bypass Solenoid Valve Control Circuit High Voltage Test Status
    • Turbocharger Bypass Solenoid Valve Control Circuit Open Test Status
    • Turbocharger Bypass Solenoid Valve Control Circuit Low Voltage Test Status
    • Go to next step: If Malfunction is not displayed 
  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.
    • Go to next step: If a series of clicks in increasing frequency is heard or felt 
  9. Verify the parameters listed below do not display Malfunction when commanding the Turbocharger Wastegate Solenoid Valve between 15 - 100% with a scan tool.
    • Turbocharger Wastegate Solenoid Valve Control Circuit High Voltage Test Status
    • Turbocharger Wastegate Solenoid Valve Control Circuit Open Test Status
    • Turbocharger Wastegate Solenoid Valve Control Circuit Low Voltage Test Status
    • Go to next step: If Malfunction is not displayed 
  10. 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 below.

    • Go to next step: If within 20 kPa (2.9 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 below

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