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Just found this under the drivers seat of all places tcm? And reman with just 44000 miles I don't like that... What is this thing?

The rest of it

Here we go

Okay I'll get all those photos on here for y'all soon and thanks for all the input guys this is helping me out major and I'm not familiar with where the lift pump may be but I'll get pics of everything else. So how can I have an obd1 and no computer so the obd1 may only run the tcm? Thanks...

I've checked all fuses and everything looked good there.....so I do have an ecm then? Or just the tcm? And I've jumped the 2 upper right terminals on the 12 pin and nothing flashed unfortunately..if it's possible I'd love to have a pic of the wiring diagram to the transmission to the tcm and...

It is for sure a Y Vin code. Thank you for clearing that up for me so could that be why the ses light won't flash codes? Where can I find the tcm? So without the obd can it still be diagnosed for codes?

Is there a procedure for adjusting it or testing it to omit from the problem list?

I'll remove the port tomorrow to see the letters on the back of the unit and make sure I'm in the proper holes... And what voltage should I see at the obd1 port? I can't get a test light to come on no matter what part of the port I check and I've heard that they may or may not have a positive...

Thanks alot for the tip and where would the tps be on this vehicle I've checked the pedal it's only hooked to the throttle linkage. And how would I test the internal harness I plan on replacing it regardless it's 35$ on Amazon...also I have a little fluid in the plug not leaking out to tell...

Thanks for the link I would get that program today if I knew I would read my truck but the paperclip and part store obd test didn't work anyone have a wiring diagram? Are these things powered 12v like a obd2?

Hello all new here to the forum not sure if this is the correct spot to post anywho I'm having an issue with my newly purchased 6.5l Naturally aspirated 4l80e combo in a '95 Air Force box truck. I bought it from a friend not running as the battery's we're removed because of a charging problem...