Circuit/System Testing
WARNING: This page is about a different car, the 2008 GMC Sierra, 2008 GMC Cab & Chassis Sierra, 2008 Chevrolet Silverado, and 2008 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
If you cannot duplicate the condition, operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records.
Observe the DTC information with a scan tool. If DTC P2146, P2149, P2152 or P2155 are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle .
One Fuel Injector DTC Sets
- Disconnect the affected fuel injector connector.
- Turn ON the ignition with the engine OFF.
- Connect a test lamp between the affected fuel injector control circuit and a ground. The test lamp should not illuminate.
- If the test lamp illuminates, test the fuel injector control circuit for a short to voltage.
- Connect a test lamp between the affected fuel injector control circuit and battery voltage. The test lamp should not illuminate.
- If the test lamp illuminated, test the fuel injector control circuit for a short to ground.
- Test the affected group injector positive voltage control circuit for a short to ground or a short to voltage.
- Test the affected fuel injector for high resistance. Refer to Component Testing in this diagnostic.
- If the circuits tested normal, replace the ECM.