My LC-1 Installation Guide

[jrsaucke]

Hmmm is anyone using an LC-2 with motronic without a check engine light?

Coming back to this. Still bugging me as I'm about to get the car on the road finally. I checked my relay and there is zero resistance between pins 87 and 30.

Considering putting a normal O2 sensor back in for now...

[Chris Spiegl]

Hmmm is anyone using an LC-2 with motronic without a check engine light?

I am! I have the signal going through the o2 sensor harness. The power comes from somewhere near the cig lighter.

I am about to switch over to a megasquirt unit. Any tips on where I should ground it? Is the shocktower okay for megasquirt?

[Need4Speed1299]

Is the same procedure required for an mtx-l?

[ak-]

Is there any way to tell if I damaged it without cannibalizing another relay? I do have a spare(s?).

Maybe the solder connection inside is bad. I seem to remember it struggling to take hold on one of the surfaces when I did it, but I thought it eventually took.

Try jumping it with external wiring on the forks instead on your spare relay and see if the CEL goes away. A code is a code and it's directly pointing to the relay and/or wiring so give it a shot!

[fporro]

thanks for great write up !
cheers,
Frank

[jrsaucke]

Hmmm is anyone using an LC-2 with motronic without a check engine light?

[jrsaucke]

Is there any way to tell if I damaged it without cannibalizing another relay? I do have a spare(s?).

Maybe the solder connection inside is bad. I seem to remember it struggling to take hold on one of the surfaces when I did it, but I thought it eventually took.

[bmwman91]

Maybe you accidentally damaged the coil in the relay? I THINK that the O2 heater code is given when it thinks that the relay is not present.

[jrsaucke]

I'm struggling with the install of my LC-2. There is only a single ground for the LC-2 so the wiring doesn't really match what is here.

I cannibalized a stock O2 sensor harness and spliced the LC-2 into the other half of the original O2 sensor. I popped open the relay as shown in the first post and shorted it. Everything seems to work fine. The engine runs and settles in at stoich after it gets up to temperature, but I am getting a stomp code and hesitation (I think the hesitation is a different issue).

1264: O2 sensor heater

Did I wire this up incorrectly?

Edit: Still running motronic at the moment

[nando]

you could use a PWM module off a junkyard E46 and do the same thing. pretty sure you could score one for $25 or less.

it's got power, grounds, and the PWM signal. MS2/3 has enough PWM outputs to control that no problem.

[bmwman91]

I am not familiar with the wiring on the 325iX, so you'll need to find wiring diagrams and see what's what.

I have also updated the original post to mention that I no longer recommend the Innovate LC-x products.

[imwhyteyo]

I have everything else connected proper.. im pretty sure. The purple and green wire, is the power to the fuel pump.. it turns on momentarily when switched on. So ive spliced I to that.. but im stuck as to knowing where to connect the splice to.

[imwhyteyo]

Im a bit confused at the part where it says to jump the fp relay to the o2 relay. Do you leave them connected to the relays? Or splice the two wires together leaving them ALSO connected to the relays? Also curious wich relay is the 02 relay? Asumming its the one immediately next to the fp relay.. the wiring coloring is not the same in a 91 325ix.

[axisofjustice]

Installed and running. Awesome! With this write up and my changes it was very easy!

[axisofjustice]

In a day or so my install will be done, so I wanted to update this thread with my experience from a beginner's perspective.

I've made my harness plug and play except for the ground at the latch bolt. it was simple, and I'd recommend doing it every install because you can't hurt the harness in the car this way! I used the pigtail from the old o2 and wired the pushbutton and led inline where it will sit in either the glovebox, the battery tray, or under the firewall wiring cover. I have not decided yet, whatever is most practical when I've routed the cabling.

When I modded the relay for the heater, I just used the soldering iron to plastic weld the cover back on it, I feel like it will be more durable in the elements this way.

P.S. WOW, the stock o2 sensor was a SOB to remove.