Circuit/System Testing
WARNING: This page is about a different car, the 2010 GMC Sierra, 2010 GMC Cab & Chassis Sierra, 2010 Chevrolet Silverado, and 2010 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
- Test the affected fuel injector control circuit for an open between the ECM and the fuel injector.
- Test the affected fuel injector for high resistance. Refer to Component Testing in this diagnostic.
- If the circuit and fuel injector test normal, replace the ECM.
Two or More Fuel Injector DTCs Set
- Test the affected fuel injector circuit for the following:
- An open between the ignition position voltage control circuit splice and the fuel injector connector
- An open between the ECM and the ignition positive voltage control circuit splice
- Test the affected fuel injector for high resistance. Refer to Component Testing in this diagnostic.
- If the circuit and fuel injector test normal, replace the ECM.