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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1361 (Engine Controls And Fuel - 4.3L - Troubleshooting & Diagnosis) >> Fuel Injector Diagnosis (w/J39021 or Tech 2) >> Component Testing >> Fuel Injector Balance Test with Special Tool

Fuel Injector Balance Test with Special Tool

WARNING: This page is about a different car, the 2009 GMC Sierra and 2009 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Set the amperage supply selector switch on the fuel injector tester to the Balance Test 0.5-2.5 amp position.
  2. Connect the J 39021  , J 39021-210  , and the J 39021-301  to the fuel meter body. See Special Tools .
  3. Command the fuel pump relay ON and then OFF three times with a scan tool. On the last command, as the fuel pressure begins to slowly degrade and stabilize, select a fuel pressure within 34 kPa (5 psi) of the maximum pump pressure. Record this fuel pressure. This is the starting pressure at which you will pulse each injector.
  4. Command the fuel pump relay ON one more time and energize the fuel injector by depressing the Push to Start Test button on the J 39021  at the previously selected pressure. See Special Tools .
  5. After the injector stops pulsing, select Min from the Display Mode and record the Min pressure.
    6. IMPORTANT: New test results will not be recorded if the Min/Max results are not cleared after each injector is tested.
  6. Clear the Min/Max results.
  7. Select Normal from the Display Mode.
  8. Repeat steps 2 and 4 through 7 for each fuel injector.
  9. Perform the Pressure Drop Calculation.
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