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!

[placham]

Yeah no prob... hope u get it sorted,,, text me if u got any other concerns...

FYI his not dissy....4th gen 3SGTE st215 motor same a mine,,, we're COP dissyless ignition, n no resistor box for injectors
I havent been messing with mine in while...knock on wood..
I'll see if I can get to my coils and see if its 4 wire plug diagram only shows 2 wires,,, but on coil it should say - + or E something like that
There should be constant power with key on, and chassis ground at each coil, then trigger wire and think feedback to ecu or something.

Matt

Did u double check all your fuses, not sure how yours is wired if power for injectors and coils goes through a relay but would be a bad idea to check that too,, I had issue on my Silvia on my Rb, relay go wet and from resistance it would get hot and brake contact.

This post has been edited by placham: Jul 10, 2015 - 12:00 AM