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Home >> Chevrolet >> 2006 >> Optra LS, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 1.4L DOHC >> Diagnostic Information and Procedures >> Fuel System Diagnosis >> Circuit/System Description >> Circuit/System Verification
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Circuit/System Verification

    IMPORTANT:
    • Inspect the fuel system for damage or external leaks before proceeding.
    • Verify that adequate fuel is in the fuel tank before proceeding.
  1. Ignition ON, command the fuel pump relay ON with a scan tool. You should hear the fuel pump turn ON and OFF.
  2. Ignition OFF, all accessories OFF, install the J 34730-1A  . Refer to Fuel Pressure Gage Installation and Removal .
  3. Ignition ON, command the fuel pump relay ON with a scan tool. Verify the fuel pressure is between 380-427 kPa (55-62 psi).
  4. If the vehicle passes the Circuit/System Verification Test, then operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that are captured in the FreezeFrame/Failure Records List.
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