Sup guys, soo have been driving my fc without a tps thinking it was bad. Today I got a new tester and decided to test it. Reads just fine when disconnected. So adjusted it. Plugged it in and double checked it. Now with it being plugged in, it reads 0.7xx closed and goes up to 1.700, then 1.900 then down to 700ish. Disconnected it again and read normal. So I plugged it back I. And disided to wiggle the harness around, when I move the harness around by the injectors the ohms start jumping on my dmm

 

check the 5v reference voltage with it plugged in, the reference wire is simply crimped in circuit addons and can easily be a problem inside the harness.

 

I sorry, I a little slow with wiring lol. Can you explain a bit more, this all happened after I put everything back together after my rebuild a few weeks ago

 

well you didnt put any car information , so....

 

Wow, you're right lol. 88 T2, stock ecu, street port, stock everything pretty much except exhaust and bov.

 

Can it be a bad ground causing this? I did respray my engine bay when I dropped in the motor. I kind of scratched off the firewall ground point and the one in the driver side shock tower, were the battery ground to. Should I check anything els? I'm this close to just taking my engine harness apart and removing what is not being used and checking for exposed wires

 

the orange wire i believe was the 5v reference, it should always be about 4.8v-ish with the key on or engine running.

there's lots of exposed wiring in the FC harness, that's part of the problem, mazda did a horrible job on their splices. and yes, it could be a ground issue but the ground is on the rear rotor housing, not easy to get to.

 

It's weird tho. Looking at the diagram, that wire and ground(black) go to the mag and the green one goes to the ecu. I have the orange one does show the right voltage. The green one shows wrong