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Home >> Chevrolet >> 2012 >> Cruze Eco, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 138 (Engine Controls And Fuel - 2.0L - DTC P0243 To DTC P0690) >> DTC P0243, P0245, or P0246 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2010 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
  1. Clear the DTCs with a scan tool.
  2. Inspect for damage to the Q42 turbocharger wastegate actuator.
  3. Ignition OFF, disconnect the harness connector at the Q42 turbocharger wastegate actuator.
  4. Ignition ON, verify that a test lamp illuminates between the voltage supply circuit terminal 2 and ground.
    • If a test lamp does not illuminate test the voltage supply circuit for a short to ground or an open/high resistance.
  5. Verify that a test lamp does not illuminate between the control circuit terminal 1 and ground.
    • If the test lamp illuminates, test the control circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
  6. Connect a test lamp between the control circuit terminal 1 and the voltage supply circuit terminal 2.
  7. Command the Turbocharger Wastegate Solenoid parameter to 50 % with a scan tool. The test lamp should illuminate and flash rapidly when commanded to 50 % and turn OFF when commanded to 0 %.
    • If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the K20 ECM.
    • If the test lamp is always OFF, test the control circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.
  8. If the circuits test normal, test or replace the Q42 turbocharger wastegate actuator.
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