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Home >> Pontiac >> 2009 >> G3 Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 89 (Engine Controls And Fuel - 1.6L (LDE, LLU, And LXV) Or 1.8L (2H0) - Troubleshooting And Diagnosis) >> Fuel Injector Balance Test with Special Tool >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2010 Chevrolet Aveo. However, it is still accessible from the selected car via links, so may be relevant.

Fuel Injector Balance Test with Special Tool

  1. Ignition ON, verify the scan tool engine coolant temperature (ECT) parameter is less than 94°C (201°F).
    • If greater than the specified range, allow the engine to cool before proceeding.
  2. Ignition OFF, install the fuel pressure gauge. Refer to FUEL PRESSURE GAUGE INSTALLATION AND REMOVAL .
  3. Ignition ON, verify the fuel pressure is within 365-414 kPa (53-60 psi).
    • If not within the specified range, refer to Fuel System Diagnosis  for further diagnosis of the fuel system.
  4. Monitor the fuel pressure gauge for 1 minute. Verify the fuel pressure does not drop greater than 34 kPa (5 psi).
    • If greater than the specified range, refer to Fuel System Diagnosis  for further diagnosis of the fuel system.
    5. CAUTION: Do Not repeat any portion of this test before running the engine in order to prevent the engine from flooding.
    NOTE: DTCs will need to be clear after completing this procedure.
  5. Connect the J 39021  to a fuel injector with the amperage supply selector switch on the fuel injector tester to the Balance Test 0.5-2.5 amp position.
  6. Command the fuel pump relay ON with a scan tool and record the fuel pressure indicated by the fuel pressure gauge after the fuel pressure stabilizes. This is the first pressure reading.
    7. NOTE:
    • Repeat this step for each fuel injector in order to obtain a pressure drop value for each fuel injector.
    • The fuel pressure may rise after the fuel injector stops pulsing. Record the fuel pressure value immediately after the fuel injector stops pulsing. DO NOT record the higher fuel pressure value.
  7. Energize the fuel injector by depressing the Push to Start Test button on the fuel injector tester. Record the fuel pressure indicated by the fuel pressure gauge after the fuel injector has stopped pulsing. This is the second pressure reading.
  8. Add all of the individual pressure drop values in order to calculate the total pressure drop. Divide the total pressure drop by the number of fuel injectors in order to calculate the average pressure drop. The difference between any individual pressure drop and the average pressure drop should not be greater than 20 kPa (3 psi).
    • If the difference between any individual pressure drop and the average pressure drop is greater than the specified range, replace the fuel injector.
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