How to get the ECU out of the Celica GT-Four / All-Trac
Know where your ECU is. It's between your feet and the passenger's feet on the drive shaft tunnel behind the radio.
Pull back the carpeting so you can see what you're doing.
Undo the 10mm bolt on the passengers (RIGHT for you non US peeps) side.
Undo the two phillips head screws on the driver's side (US Spec) and then the 10mm bolt to get the bracket out of your way.
Pull the blue thing (what is that anyway?) off the ECU mounted bracket completely. Don't unplug it, just slide it out.
Un plug all the wires running from the wiring harness. There are 5 on the ST165.
Carefully slide the ECU out from its resting place. There is a metal clip in the back that will make a "sproing" noise when you do.
Look at the label and think to yourself "hmm I could get a G-Force in here" or "hmm this thing is worth a thousand bucks" or "hmm what did I take this out for again?"
(Use the back button)