The actual model is the 42-2FG20 this is a second generation truck. You are going to be really hard pressed to find a parts or service manual for this truck. Toyota does not even print them any more so hopefully someone here might have one or can send you sections of it. If the data tag is all in Japanese you most likely have what they call a gray market truck that was produced in Japan and only for Japan so even if you do get the parts manual the parts may not be the same as what it on the truck.