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Home >> Chevrolet >> 2007 >> Chevy Express G2500, Van Cargo, 6.6 6 >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 8 (Engine Control System & Fuel System - 6.6L (LLY) - Troubleshooting & Diagnosis) >> Fuel Injector Balance Test with Tech 2 (Automatic Transmission) >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
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. Apply the parking brake and hold the brake pedal in the fully applied position. A hissing noise will be noticeable when the brake pedal is fully applied. Place the transmission in Drive and idle the engine for a minimum of 30 seconds. With a scan tool, observe the balancing rates parameters for cylinders 1-8 while the engine is at idle speed. Repeat this procedure with the transmission in the Park or Neutral position. Balance Rates should be between +4 mm3 and -4mm3 in Park or Neutral and +6mm3 and -6mm3 in Drive.
    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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