Originally Posted by j9fd3s' post='885641' date='Oct 17 2007, 12:28 PM

you check the plugs and wires too? good working coils?

Originally Posted by RotaMan

We checked the CAS as well at the ECU.



We don't get the right voltage on any of the wires for the trailing coil from the ECU



1x is supposed to be below .8v, we get 5-7v

1m is supposed to be below 2v, we get around 12 if I remember.

1u suppose to be about 2.2v, we get a much high voltage as well.



This is with the engine running, trailing coil plugged in and back stabbing the ECU.



The grounds on the body of the coil are good, cleaned those up. On pin 1x, the voltage will be around 12v or more with the trailing not bolted, but about 5-7v when the coil is grounded.



What could this odd voltage? We tried different coils and ECU swapped from my car. His stuff works in my car. The connections seem ok I could find anything wrong with them. What else may cause this?

Originally Posted by HAILERS

There's a black bullet connector at the Trail Coil. Hope nobody grounded that single wire, black bullet connector. It has a yellow/blue wire on it that is shared by the tach.



Other than ringing out (ohming out) each wire from point to point (ECU pin to the appropriate pin at the Trail coil assy), at the Trail coil........I've no idea right now.

Originally Posted by HAILERS

Is this a stock harness?? All stock harness? No JDM stuff in there? It's almost as if the wires like 1M, 1X, 1U are going somewhere other than where they should be going.



So, how much of this car is stock?

Originally Posted by HAILERS

Disable the rpm switches where they are connected to the coil signal or where ever they are getting their rpm signal from. Completley remove that wire from the engine/ECU. then try again.



There should be NO wire going to the Trail coils black bullet connector once you do this. Then try again for fire at the Trail coil assy.

Originally Posted by Red_Sun

My friend and I just fixed driver side strut tower main ground. We were getting weird readings from the what we think is a ground almost under the coil, there is a ground block that gives us weird numbers (high resistance and voltage fluctuations)



The ground on the drivers side strut tower didn't have continuity before, we cleaned it and the ground works well now.



My bro, thinks the system is grounding itself somewhere before the ground near the trailing coil, which is giving the weird readings.

Originally Posted by RotaMan

I tried this already. Even though the connections are securly soldered. I that that maybe there was a slim chance the connection was not good. So desoldered and cut and stripped the trailing wire in the harness and from the ECU and connected them back up.



Still nothing.



The bullet connector has never had anything plugged into it.



Color for color with wires match up. I never did continuity testing though.





Tried it.



I remember reading a thread where guitarjunky had a similar problem, slightly different, but similar. He never found the reason.