Author Topic: Need help wiring in LC-1 wideband controller (Read 3698 times)

Master · « **on:** May 03, 2008, 05:42:03 PM »

Hello everyone, I've been away for some time now, but I'm back in business

And this time I need some help from people that have successfully wired in a wide-band controller with stock ECU. I know bmwman91 has had success but maybe other people here can help also...

So my question is this: how do you wire up a wide-band controller (like LC-1) emulating the narrow-band one, and without having the ECU throw out error codes?

There close to zero information on the internet, and a lot of people had problems with their install (like nuvola rossa)

A guy named russelcq on bimmerforums says that it's impossible to fully emulate a narrow-band with LC-1 and a BMW engine, but his arguments aren't very firm (original thread here: click)

So people please help me solve this mystery, as I have my LC-1 just lying there for a week now and I want to know if it can be used with a stock ECU before I spliced up my wiring

THANKS!

tim_s · « **Reply #1 on:** May 04, 2008, 02:17:02 AM »

I use my LC1 to emulate a narrowband for my LPG setup, works fine. never tried it on the bm ecu because UK cars don't have a lambda probe. to set it up, follow the instructions in the LC manual.

bmwman91 · « **Reply #2 on:** May 06, 2008, 12:37:15 PM »

The instructions should cover the power wiring part pretty well. As for the narrow-band emulation, there are 2 analog outputs from the LC1. Both are fully programmable. One comes configured emulating NB from the manufacturer.

I BELIEVE the two analog outputs are the yellow and brown wires. let me run out to the parking lot and see which one is hooked to the data logger (other must be to the Motronic)....

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The yellow wire should be the NB wire. Just hook it up to the EGO signal input to the Motronic. I chopped up the harness from the original O2 sensor and used to that to connect it to the original port. I also rewired some stuff by the EGO heater relay and powered the LC-1 from that.

Master · « **Reply #3 on:** May 07, 2008, 04:53:53 AM »

OK, thanks for your your input, my concern is that it's not as easy as following the manual.

Almost all info on the net concerning emulating narrowband with innovate LC-1 or LM-1 on a BMW is not conclusive. People are experiencing issues with voltage offsets, and the ECU throwing out error codes.

bmwman91 have you diagnosed your ECU for any error codes? There are error codes that don't light the check engine light on the dash...

There is a discussion about these issues in the second half of this bimmerforums thread

Few people state that BMW uses some real complex calculations to determine AFR with the stock narrowband. And LC-1 / LM-1 can't truly emulate a physical narrowband, because of this the ECU suggests the LC-1 / LM-1 emulation is a faulty/failing O2 sensor and goes into various states of limp mode...