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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1356 (Engine Controls And Fuel - 4.8L, 5.3L, 6.0L, 6.2L - Troubleshooting & Diagnosis) >> Fuel Injector Diagnosis (w/J39021 or w/Tech 2) >> Component Testing >> Fuel Injector Balance Test with Tech 2

Fuel Injector Balance Test with Tech 2

WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. 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.
  2. With a scan tool, select the Fuel Injector Balance Test function within the Special Functions menu.
  3. Select an injector to be tested.
  4. Press Enter to prime the fuel system.
  5. Energize the fuel injector by depressing the Pulse Injector button on the scan tool at the previously selected pressure.
  6. After the injector stops pulsing, select Min from the Display Mode on the CH-48027  and record the Min pressure. See Special Tools .
    7. IMPORTANT: New test results will not be recorded if the Min/Max results are not cleared after each injector is tested.
  7. Clear the Min/Max results on the CH-48027  . See Special Tools .
  8. Select Normal from the Display Mode on the CH-48027  . See Special Tools .
  9. Press Enter on the scan tool to bring you back to the Select Injector screen.
  10. Repeat steps 3 through 9 for each fuel injector.
  11. Perform the Pressure Drop Calculation.
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