So i have a 93 sc300 that i did a tt-ecu, 7mgte injectors, waste spark, and so on. So i have been driving it for the last month and it has been going lean past part throttle. I had a intake leak. I fixed that and still running lean. So i wired up a safc neo to see if i could fix it. While in settings on the neo i was watching and found the throttle position was only going to 25%. So i tested tps and it was junk. Put a new toyota one in and it worked perfect. Put it all back together and broke 2 wires at the tps. Now i have a no start, no spark, no injector pulse and no tps. Also no check engine light with key on. I have power going to the b+ terminal on the ecu and a good ground. Checked all my na-t wiring no problems there. Did it fry my ecu.

 

Have you fixed the broken wires?

 

Yes the broken wires are fixed. also ohmed out the wires to the computer to verify.

 

if the 5v wire on the tps shorted out to ground, yes you could have blown the 5v driver on the ecu, meaning the tps, map sensor, anything in the car that uses 5v wont operate cause the ecu takes in the 12V and then outputs its own 5V to those sensors internally. you can try looking at fuses to see if one saved you but generally those 5v items will short out the ecu itself, and its a pretty rare thing to happen for the most part. not the best of news but at least you have an idea of what caused it. probe the tps and map sensor wires to see if 5V is coming there, if it isn't it could likely be fried. do you have a spare ecu to test?

 

I dont have a spare ecu. I have checked all the fuses. I was thinking it was the ecu but obviously i was hoping it was something cheap. I will check that thanks.

 

some places might be able to repair the ecu, def let them know you shorted it out potentially versus the normal bad capacitors.

 

Hopefully there's local shops that can repair your ECU if it is fried brotha, if not then it's time to hit the classifieds!