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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1362 (Engine Controls And Fuel - 6.6L - Troubleshooting & Diagnosis) >> Fuel Injector Balance Test with Tech 2 >> Circuit/System Verification

Circuit/System Verification

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.
IMPORTANT: If any DTCs other than DTC P0300-P0308 are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
  1. Start and run the engine until the coolant temperature is more than 82°C (180°F). Turn OFF all accessories.
  2. Perform the fuel pressure regulator test, refer to Fuel Pressure Regulator Diagnosis .
  3. With a scan tool, command the Balance Rate Monitor ON. Balance rates should be between +4 mm3 and -6.9 mm3 in Park or Neutral. Balance rates outside the range may indicate contaminated fuel. Refer to Contaminants-in-Fuel Diagnosis .
    4. IMPORTANT:
    • The Cylinder Power Balance Test must be performed under the conditions for which the customer concern occurred.
    • Do not operate the cruise control during this test. Cruise control may cause a brief surge of engine speed after the completion of the test.
  4. Perform the Cylinder Power Balance Test with a scan tool. During cylinder cancellation a noticeable power difference will feel like a misfiring cylinder or vibration.
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