To be certain, you should consult a repair manual specific to your vehicle's year, make, and model. A Haynes or Chilton manual, or a digital version from a reputable source like Mitchell 1, will provide accurate diagrams and location information. These manuals will also show you how to safely access and replace the unit if needed.
Looking at diagrams online for a 2002 4.7L engine might help, but always confirm with a vehicle-specific manual before attempting any work.