Silverado 1500 4WD V8-6.0L Hybrid (2009)
‹› If the difference is equal to or less than 3 ohms, refer to AFIT Test Procedure.
‹› If the difference is more than 3 ohms, add all of the fuel injector resistance values to obtain a total resistance value. Divide the total
resistance value by the number of fuel injectors to obtain an average resistance value. Subtract the lowest individual fuel injector resistance
value from the average resistance value. Compute the difference between the highest individual fuel injector resistance value and the
average resistance value. Replace the fuel injector that displays the greatest difference above or below the average.
Important:
*
DO NOT perform this test if the engine coolant temperature (ECT) is above 94°C (201°F). Irregular fuel pressure readings may result
due to hot soak fuel boiling.
*
Verify that adequate fuel is in the fuel tank before proceeding with this diagnostic.
AFIT Test Procedure
1. Ignition OFF, open the hood to disable the Auto-Stop function. Refer to Hybrid Modes of Operation Description (See: Hybrid Drive
Systems/Description and Operation/Hybrid Controls/Hybrid Modes of Operation Description) .
2. Ignition ON, verify the scan tool hood position parameter displays OPEN
‹› If the hood position does not display OPEN, refer toDiagnostic Trouble Code (DTC) List - Vehicle (See: Computers and Control
Systems/Testing and Inspection/Diagnostic Trouble Code Descriptions) for DTC P254F.
3. Turn OFF all accessories.
4. Turn OFF the ignition.
5. Install the AFIT. Refer to the AFIT User Guide.
6. Turn ON the AFIT and select the vehicle.
7. Turn ON the ignition and perform the Injector Test.
‹› If the AFIT aborts testing due to fuel pressure or fuel leak down, refer toFuel Injector Diagnosis (w/CH 47976) Fuel Injector Diagnosis (w/J
39021 or Tech 2) (See: Computers and Control Systems/Testing and Inspection/Component Tests and General Diagnostics/Fuel Injector
Diagnosis (w/J39021 or w/Tech 2)) .
8. View the test results.
‹› If any injector exceeds the recommended tolerance, replace the injector(s), E-85 only. All other engine, refer toFuel Injector Cleaning (See:
Service and Repair/Procedures) .
Repair Instructions
Perform theDiagnostic Repair Verification (See: Computers and Control Systems/Testing and Inspection/Diagnostic Trouble Code Tests and
Associated Procedures/Verification Tests and Procedures) after completing the diagnostic procedure.
Fuel Injector Replacement (See: Service and Repair/Removal and Replacement)
