no start CEL Code 12 and constant flashing (misfire?), tried everything kind of stumped Options

[easternpiro1]

Hi all, een having a problem starting my car ever since I got the transmission replaced.

First, the car was giving me a
CEL 12 wiring and connector g2 + signal, STA signal crank position sensor and ECU
14 and 15 wiring connector, ignition coil, ecu

There is also another 14 code listed in the diagostic -wiring and connector, ignition and ecu
Things I've tried:

I've checked all plugs first to make sure there was no significant damage. (Found some on the main harness connector under the fuse box in the engine bay) checked for continuity, seemed fine.

Checked wire going from ECU to crank sensor for continuity, replaced crank sensor to no avail.
I also changed the cam sensor. Car still won't turn over.

We checked for spark and fuel (I'm getting spark and I'm getting fuel as my FPR is reading pressure and in took out injector plug #1 and used a NOID Light.

We also checked for spark and fuel using an old school method by bypassing injectors and putting fuel directly in. The car DID start but ran horribly and cut off shortly after.

Now I have a constant blinking when I pulled codes.

There was NO signal coming from ecu to injector according to Noid light. So it MUST BE ECU? Nope. Replaced ecu same no start but now I'm only getting code 12 and still getting a misfire code (constant blinking)


Does anyone have any helpful suggestions? A bud of mine and I will be tracing wires today but any assistance would be greatly appreciated.


Placham Thanks for the ECU and help so far. I'm sure we can figure this misery out!

[easternpiro1]

Thanks smaay!

I did that and found that I got continuity, however I found my problem. I hope.


I bought some coil packs from bonsai in February or so, because one of my coils went bad. Replaced 2 of them and all was well. While I was quadruple checking grounds etc. I decided to switch out coilpacks from 1&2 cylinder and put them in 3&4, and vice versa.

I started the car, and kept the key turned while pressing the gas pedal it ran horribly and would die if I let off the gas. I switched the coils back and it wouldn't run. I'm hoping this is my problem.


Still dosen t make sense though, why was I getting spark on the 2 other occasions when tested? And why would they malfunction after getting the transmission replaced?

Also the codes 12 14 and 15 never mentioned coils but sensors. I would love to know how this happened so I can explain it in the future if it happens to someone else. I spent $$$$ chasing ghosts