Reach the end of Fire Canyon was a mission in The Precursor Legacy that Jak and Daxter completed to obtain a power cell. Keira required 20 power cells to properly power the heat shield on the A-Grav Zoomer to be able to start this mission. Jak then had to cross the Canyon and turn on the teleport gate in Rock Village to allow Samos and Keira to come over.
Completion of this mission in the PlayStation 3, PlayStation Vita, and PlayStation 4 versions of The Precursor Legacy will unlock the bronze trophy Zoom!.
Walkthrough[]
You only use the A-Grav Zoomer this time; technically, the mission starts the moment you get on and ends the moment you reach the trans-pad at the end of the Canyon. Driving skill is key in this mission, with the heat of the lava being the main danger. If the heat meter builds up fully, the zoomer will explode.
It rises slowly when flying over molten lava but quickly over open lava, which should be avoided as much as possible. Use Precursor metal platforms or babaks to stay airborne and avoid the heat directly. Using 
can also alleviate the heat danger by hopping over the lava pools.
Other dangers are sudden drops into bottomless depths, stalagmites suddenly appearing in front of you and blocking your way, and stacks of dark eco boxes. The stalagmite generally come in pairs where one goes up and the other goes down; they have a tendency to go switch positions right when you intend to cross them however.
Notably, Keira has released many cooling balloons; they are easily noticeable with their bright blue color. Hit them to lower your heat meter. Several blue eco vents can also be used to gain a useful speed boost and cross the Canyon quicker.