to answer your Q, you can't.
quite a few posts on this. posting the year and vehicle it's in would have saved me a bit of research on these.
'97-'07, 2.5 L Diesel D4D Commonrail TURBO Diesel 2 KD Engine
can't help you trouble shoot, but i can supply you with the factory shop manual,
http://www.ncttora.com/fsm/2007%20Hilux/Dieselmotor.pdf
parent pg for applicable chassis info,
http://www.ncttora.com/fsm/
you'll have to fend for yourself scouring the pdf for your info, but all should be there.
if that doesn't get you going, get the heckle out of Y questions and go to,
http://www.pirate4x4.com/forum/index.php
sign up and post your issues there. these ppl are from all over the globe and have done everything.
cheers!