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Home >> Chevrolet >> 2012 >> Cruze Eco, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 135 (Engine Controls And Fuel - 2.0L - DTC P000A To DTC P0238) >> DTC P0033-P0035 >> 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. Ignition OFF, disconnect the harness connector at the Q40 bypass valve solenoid.
  3. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 2 and ground.
    • If the test lamp does not illuminate test the ignition circuit for a short to ground or an open/high resistance.
  4. 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.
  5. Connect a test lamp between the control circuit terminal 1 and the ignition circuit terminal 2.
  6. Command the bypass solenoid ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    • 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.
  7. If the circuits test normal, test or replace the Q40 charge air bypass valve solenoid.
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