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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 P2533 >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the ECM harness connector X1.
  2. Ignition ON, test for battery voltage on the ignition 1 voltage circuit terminal X1-28.
    • If less than the specified range, test the ignition 1 voltage circuit for an open or a short to ground.
  3. Verify a test lamp illuminates between the ignition 1 voltage circuit terminal X1-28 and ground.
    • If the test lamp does not illuminate, repair the ignition 1 voltage circuit for a high resistance.
  4. If the circuit test normal, test or replace the ECM.
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