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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 P2146 or P2149 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the appropriate fuel injectors. Refer to diagnostic aids.
  2. Verify a test lamp does not illuminate between any of the fuel injector circuits and B+.
    • If the test lamp illuminates, test the appropriate circuit for a short to ground. If the circuit tests normal, replace the ECM.
  3. Test for less than 1 volt on all of the fuel injector circuits.
    • If greater than the specified range, test the circuit for a short to voltage. If the circuits test normal, replace the ECM.
  4. Test for less than 1 ohm of resistance on all of the appropriate fuel injector circuits.
    • If greater than the specified range, repair the appropriate circuit for a high resistance.
  5. If all circuits test normal, test or replace the fuel injector.
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