Hello, new to the forum. Sorry to make my first post a problem. Have had a 96 es300 for around 2 years and when I went to smog it, it passed everything but the monitor check. Car runs perfect but after checking into the problem I found it is resetting every time I key off and back on. Was hoping to get the pin out for the ecu or even the location of the constant hot to the ecu so I can check and see if it's getting power all the time. Car did have an alarm in it at one time, kinda hoping it's just a clipped wire. Thank you in advance

 

Good chance if you inspected the harness and connectors going into the ECU you'll find the problem.

 

Are there any common know problems I should be looking for?

 

See if there are any wires cut or spliced, or a relay put inline. Has the alarm system been completely removed or is there stuff still under the steering column. I could be wrong but I think the ECU gets constant power from the AM1 fuse 40 amp and the 10 amp gauge fuse. And of course it gets switched power from the ignition.

edit - here's a wiring diagram for a 1994 Camry close enough page 81 shows constant power to the ECU.
https://www77.zippyshare.com/v/fB3ZaX3D/file.html