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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 P0087, P0088, or P0089 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition ON, command the fuel pump ON and OFF with a scan tool. Verify the fuel pump turns ON.
  2. Ignition OFF, install the DW100-010  , refer to Fuel Pressure Gage Installation and Removal . See Special Tools .
  3. Ignition ON, verify the fuel pressure is between 414-483 kPa (60-70 psi)  .
  4. Ignition OFF, disconnect the harness connector at the fuel pressure regulator solenoid 1.
  5. Ignition ON, verify a test lamp illuminates between the ignition 1 voltage circuit terminal 1 and ground.
    • If the test lamp does not illuminate, repair the ignition 1 voltage circuit for a short to ground or an open/high resistance.
  6. Ignition ON, test for 3-4 volts between the control circuit terminal 2 and ground.
    • If less than the specified range, test the control circuit for an open or a short to ground. If circuit tests normal, replace the ECM.
    • If greater than the specified range, test the control circuit for a short to voltage. If circuit tests normal, replace the ECM.
  7. Ignition OFF, connect the harness connector at the fuel pressure regulator solenoid 1.
  8. Disconnect the harness connector of the fuel pressure regulator solenoid 2.
  9. Ignition ON, verify a test lamp illuminates between the ignition 1 voltage supply circuit terminal 2 and ground.
    • If the test lamp does not illuminate, test the ignition 1 voltage supply circuit for a short to ground or an open/high resistance. If circuit tests normal, replace the ECM.
  10. Ignition ON, test for 3-4 volts between the control circuit terminal 1 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.
  11. Connect the harness connector at the fuel pressure regulator solenoid 2.
  12. Inspect and repair one of the following conditions:

    Low Pressure

    • A fuel system leak
    • Restricted fuel filter
    • Injection nozzle stuck in open position
    • Leakage in the fuel rail pressure (FRP) regulator
    • Worn fuel injection pump

    High Pressure

    • Restricted fuel return
    • Fuel injection pump stuck open
    • Fuel rail pressure (FRP) regulator stuck closed
    • Restricted fuel injector
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