A fuel injector meters fuel into the engine according to the control strategy. In L-SB-0045-12 Rev1, the injector is not presumed faulty from a misfire DTC. The workflow reaches injector inspection only after the applicable misfire diagnosis finds no mechanical-engine, engine-control, ignition or fuel-supply concern.
The bulletin then calls for visual inspection of the injector tips for debris. A positive debris finding leads to replacement of all six injectors using the applicable model-year repair procedure; a negative finding exits the bulletin and returns the vehicle to normal diagnosis. This conditional boundary is part of the component record.