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Trying to get some of his mechanic money back...

Cool!

Yes, cat should be able to configure a new ECU based on the S/N. And thad looks like what you would need to interface a laptop to a cat ECU... Your truck has a 3116(mechanical inj) engine, or did you get another truck?

unpredictability is part of the problem. Cumulative time without vehicle power may be a factor, age of the internal battery may be a factor, who knows but the person who designed it... I once worked on a radar system that used a keep alive battery on the main processor board. To change the...

IDK, since it is mounted outside on the engine block, I would assume so...

You could. You could also pre-emptively replace it. I have been dealing with ECU’s for decades now and have never encountered an ECU failure. It supposedly does happen, but I have never personally experienced or heard from anyone who has had an ECU issue, working on a lot of Toyota, Honda and...

or this one:) some say cruise off, set/accel on, some say cruise on and set/accel on, it seems to work both ways, so you at least need to make that set/accel contact between the 2 ECU connector pins. The gentelman in the first vid was nice enough to list the 3126B codes. From what I have...

The battery is not replaceable, that is the problem. You must replace the ECU, and cat will program it based on your engine s/n...

Supposedly, you can read active codes on the 3126 using the check engine light. I believe this is done by closing the cruise control set/accel circuit with the cruise control circuit open/not enabled. Cruise control is native to the 3126 engine ECU. Now wether that feature was enabled on the...