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Home >> Chevrolet >> 2006 >> Cobalt LTZ >> Repair and Diagnosis >> External Pages >> Different car >> Section 793 (Engine Controls And Fuel - 2.0L - DTC P0243 To DTC P0700) >> DTC P0243, P0245, or P0246 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2008 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
  1. Inspect for damage to the TC wastegate actuator solenoid valve.
  2. Ignition OFF, disconnect the harness connector at the TC wastegate actuator solenoid valve.
  3. 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.
  4. Connect a test lamp between the control circuit terminal 1 and the voltage supply circuit terminal 2.
  5. Command the TC Wastegate Solenoid parameter to 50 percent with a scan tool. The test lamp should illuminate and flash rapidly when commanded to 50 percent and turn OFF when commanded to 0 percent.
    • If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the ECM.
    • If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
  6. If the circuits test normal, test or replace the TC wastegate actuator solenoid valve.
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