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Home › Chevrolet › 2008 › Optra LS, Automatic › Repair and Diagnosis › Engine Performance › System › Engine Controls And Fuel - 2.0L (Diesel) › Diagnostic Information and Procedures › DTC P02E1 › Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, and the MAIN fuse removed, disconnect the harness connector at the throttle body assembly.
  2. Test for less than 5 ohms of resistance between the ground circuit terminal 1 and ground.
    • If greater than the specified range, repair the ground circuit for an open/high resistance.
  3. Install the MAIN fuse. Ignition ON, test for battery voltage between the battery voltage circuit terminal 2 and ground.
    • If less than the specified range, repair the B+ circuit for an open/high resistance.
  4. Connect a test lamp between the throttle blade control circuit terminal 3 and B+.
  5. Command the throttle blade from 0-95 percent with a scan tool. The test lamp should respond to the scan tool commands.
    • 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 all circuits test normal, replace the throttle body assembly.
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