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Home >> Chevrolet >> 2008 >> Optra LS, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 2.0L (Diesel) >> Diagnostic Information and Procedures >> DTC P0045, P0047, or P0048 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF and the MAIN fuse removed, disconnect the harness connector at the turbocharger boost control solenoid.
  2. Test for less than 5 ohms of resistance between the ground circuit terminal 2 and ground.
    • If greater than the specified range, repair the open/high resistance in the ground circuit.
  3. Install the MAIN fuse. Ignition ON, verify that a test lamp illuminates between the ignition voltage circuit terminal 1 and ground.
    • If the test lamp does not illuminate, test the ignition voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition voltage circuit fuse is open, test all components connected to the ignition 1 voltage circuit and replace as necessary.
  4. Test for 3-4 volts between the control circuit terminal 4 and ground.
    • If less than the specified range, test the control circuit for an open or a short to ground. If the circuit tests normal, replace the ECM.
    • If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  5. Connect a test lamp between the control circuit terminal 4 and the ignition voltage circuit terminal 1.
  6. Clear the DTC information parameter with a scan tool. Command the turbocharger boost control solenoid between 5-95 percent with a scan tool. The test lamp should illuminate brightly at 5%, and decrease up to 95%.
    • If the test lamp does not respond to the scan tool commands replace the ECM.
  7. If all circuits test normal, test or replace the turbocharger.
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