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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 P0243, P0245, or P0246: Turbocharger Wastegate Solenoid Valve Control >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition OFF, disconnect the harness connector at the Q42 turbocharger wastegate solenoid valve.
  2. Ignition ON, verify that a test lamp illuminates between the voltage supply circuit terminal 1 or A and ground.
    • If a test lamp does not illuminate test the voltage supply circuit for a short to ground or an open/high resistance.
  3. Verify that a test lamp does not illuminate between the control circuit terminal 2 or B and ground.
    • If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the K20 engine control module.
  4. Connect a test lamp between the control circuit terminal 2 or B and the voltage supply circuit terminal 1 or A.
  5. Command the Turbocharger Wastegate Solenoid parameter between 15-100 % with a scan tool. The test lamp should illuminate, flash rapidly and increase in intensity.
    • If the test lamp is illuminated but does not flash rapidly or increase in intensity, test the control circuit for a short to ground. If the circuit tests normal, replace the K20 engine control module.
    • If the test lamp is always OFF, test the control circuit for an open/high resistance. If the circuit tests normal, replace the K20 engine control module.
  6. If the circuits test normal, test or replace the Q42 turbocharger wastegate solenoid valve.
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