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Home >> Suzuki >> 2012 >> Equator Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 41 (Fuel System) >> Diagnostic Information and Procedures >> Fuel Injector Balance Test with Tech 2 >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2007 Suzuki XL7. 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, with a scan tool verify that the engine coolant temperature (ECT) is less than 94°C (201°F).
    • if the ECT is greater than 94°C (201°F) 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 380-410 kPa (55-60 psi).
    • if the fuel pressure is 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 that the fuel pressure does not drop more than 34 kPa (5 psi).
    • if the fuel pressure decreases more than 34 kPa (5 psi) refer to FUEL SYSTEM DIAGNOSIS  for further diagnosis of the fuel system.
      CAUTION:

      Do Not repeat any portion of this test before running the engine in order to prevent the engine from flooding.

  5. With a scan tool, select the Fuel Injector Balance Test function, within the Special Functions menu. Select a fuel injector to be tested and press Enter in order to prime the fuel system. Record the fuel pressure indicated by the fuel pressure gauge after the fuel pressure stabilizes. This is the 1st pressure reading.
    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.
  6. Energize the fuel injector by depressing the Pulse Injector button on the scan tool. This will energize the fuel injector and decrease the fuel pressure. Record the fuel pressure indicated by the fuel pressure gauge after the fuel injector has stopped pulsing. This is the 2nd pressure reading.
  7. Press Enter to return to the Select Injector screen.
  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 more than 20 kPa (3 psi).
    • if the difference between any individual pressure drop and the average pressure drop is more than 20 kPa (3 psi), replace the fuel injector.
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