Current ramping coils?
Has anyone current ramped all of the coils at once on one of these?
Between Alldata and Idfix, it appears as if the coils are powered directly from the DME. Is this correct? If not where are you connecting your probe?
I believe their is a splice that you can get to but I can't remember. But if you can get to all the wires I would believe you can do all the wires at once in your amp clamp. That's how I do the GM when their is 2 fuse for injectors or coil banks.
Rudy, Fuse 01 in the Electronics Box near the DME ( A8681 is it's designation) is the supply for the ignition circuits. Regards, Eric …
Eric- When I looked at the wiring diagram it shows the coils connected directly to the DME with no fuse or anything. However as I mentioned above, my diagrams were aftermarket. I assume you have access to the OE diagram, does it show that fuse?
Rudy, Yes , the diagram shows the fuse 01 and 02 being powered by the K6341 relay. F01 is the supply voltage for the Ignition circuit through the DME (pin 10 X60001). Fuse 02 is the supply voltage for the injection circuit. I can share some detail with you directly. Send me an email tomorrow : …
You can remove the engine cover and go to the yellow wire around the 3 and 4 cylinders and get all the coils right there.
Richard- This engine has ducting and other items over it. It isn't like older bimmers with just a cover and 4 bolts.I was trying to avoid taking it apart. Guess it's unavoidable....
That stuff comes apart in like 4 minutes. A couple of 8 mm bolt and 3 or 4 5mm allen heads and the valve cover and wiring is exposed. If I can do it, so can you. :) Here is a screenshot I did a couple weeks ago. The issue was miss on cylinder 1. I got coil currents at the ORANGE wire. I guess my memory slipped on the wire color before. Hope you have a nice thanksgiving.
Hello Rudy! One of the first things I ever captured when I first got my PICO. Not a 6 at once, I just amp clamped the wires to the individual coils, Good coil VS. bad coil sorted out very quickly. When I put the fuel injection system in my truck (MegaSquirt) The coils and injectors Have two injectors to a breaker and two coils to a breaker, for a total of eight wires feeding B+ to them. I have a…
Rudy, In my experience, for what its worth, I find it easier and cleaner to scope both primary ignition current and voltage at the coil activation wires. In this case the white wires from the DME to the ignition coils. I can't give you a solid reason as to why current ramping and primary voltage on the common 87 circuit is not as clean other than it has a lot of "traffic" happening on it…
Hi Justin, good idea to clamp 4 wires to capture current to…ther. By the way, could you attach the pico files, it is a good example.
Unfortunately both of those captures show misfires. The primary voltage patterns are bad. Since they are bad captures I don't have the psd file, only the screen captures. :-(
Brandon Stickler did a video on the Trained By Techs youtube channel about current ramping all coils on a E series. However it is the N54 not N55
Thanks to Eric I did find the correct fuse,however if someone can point out on this diagram what symbol indicates there IS a fuse,it would be helpful to myself and others: ***BTW the issue was a bad injector***
Rudy, U_IGN<1 is the "path designation" on the supply wires to the coils from the DME. U=supply voltage IGN= ignition circuits <1= Fuse origin. So, if you select the diagram for Supply voltage to the DME, You will see the Fuse 1 as an input and it carries the same IGN designation. An understanding of the DIN system and how each German manufacturer applies it to the diagrams is very…