Hey guys, i am having a problem with my innovate LC-1 DB gauge not correctly displaying AFR. Only shows from 7.4-15.6. At idle numbers stay around 7.4-8.5, while driving they go up to 15.6 only.

AFR is displayed correctly in tunerstudio so the ecu is getting the input but gauge is not.

During free air calibration the gauge first flashed 7.4 during warm up, then 15.6ish when steady, and around 21-22 while i had the calibration button pressed.

My car is a 91 1.6 liter.

I have it wired;
-Red wire from DB gauge and Red wire from LC-1 to a thicker wire and that one to cig lighter 12v switched wire.
-I then have a thicker gauge wire(14-16) grounded at the ecu ground on the head, which has the yellow wire from gauge and blue and white wires from lc-1 going to it.
-Yellow wire from LC-1 un used as it is factory set for narrow band.
-White wire from gauge and the ecu input wire both go to LC-1 brown wire, factory wide band wire set for 0-5V.
-Black wire from gauge and black wire from LC-1 both going to a thicker gauge wire which then goes to LED and push button, and then ecu ground at head.

Some one suggested to reprogram the LC-1 so both brown and yellow wires are set to 0-5V, and then send gauge and ecu wires to each. Only problem with that is the previous owner cut off the 2.5mm serial cables and i did not get a terminator plug either.

Does anyone have any suggestions as to what else the issue may be? Before i try and get the serial cables hooked back up, and reprogram.

Thanks in advance!

 

Sounds suspiciously like the issue I had... Hooking thenunit up to the notebook and rerunning the setup/config on it solved the issue.

Thankfully it only took an hour or so to get to that spot in the troubleshooting.

Once I did that, all was well.

 

Thanks for your reply Joe! That is what i will have to try, just waiting for the cables to come in. Can someone tell me which of the two cables gets the terminator and which gets the serial cable to comp?

 

Ok previous issue was fixed by connecting the gauge ground wire properly.

But i still have a problem now, my gauge in the car reads 1-1.3 afr richer then what i see in tuner studio. Full lean reading fluctuates from 20.5-21.1 afr where as in tuner studio it always reads 22.33 full lean.

Is this still a wiring problem with my DB gauge?

All grounds go to same place together. From some voltage testing the DB gauge is not getting the full voltage output from the signal wire. I have ecu signal wire and gauge signal wire together to LC-1 brown wire for 0-5v output, even if it is one at a time the voltage they get does not change.

 

Are you sure the brown wire is correct for wideband and not yellow?
I also had mine reading 1-1.5 richer on the gauges then what tuner studio was seeing. i ended up selecting custom linear wideband instead of the LC-1 and set the values myself and ended up with 1V = 9.7 and 4V = 19.2 and my gauge/tuner studio are within .1 of each other. Play around with the 4V until the readings match up.

 

This is exactly what you need to do. Start with the values posted above and slowly change them till the 2 gauges match.

 

I cant because MS1.

The output that the ecu gets is correct, which is what is important.

How it works is the DB gauge is factory calibrated for 0-5V 7.35-22.39 AFR.

The brown wire from LC-1 is the wideband wire which also has the 0-5V 7.35-22.39 AFR and the yellow wire is narrowband output.

I connected the ecu signal and gauge signal wires to the brown wire, even if connected one at a time they still get the same reading so i odnt see it being a issue with having both connected to brown wire. For some reason the gauge is not getting the full voltage output to its signal wire from brown wire.

I also verified this when i had stock ecu in the car, i wired yellow to ecu signal wire so the ecu used narrowband, and brown to gauge and it still read 13.7 on gauge instead of 14.7.

I thought about re calibrating the yellow wire to an output range so the gauge reading matches ecu that way but previous owner cut off the serial cables.

For some reason the gauge is not getting the full range of the signal output, i have had it read 21.1 full lean and sometimes 20.5. Could it be a ground or power issue?

Thanks for the reply's!

 

Time to upgrade to a more modern MS unit i guess

 

Maybe.....but it still does not explain why the gauge is not getting the output correctly. Those two wires are suppose to correctly work together.

Even if i did rearrange things with MS/tuner studio so the readings matched, would that not mess up my AFR's since right now the ECU has the correct reading?

 

The gauge gets it's reading directly from the sensor correct? That would mean the afr it see's would be the correct one to go of off, the value you get in tuner studio is the one that is off..at least that is what it sounds like to me.

I had the very same problem when i installed mine and setting custom values in MS fixed it. you don't want to tune for 14.7 in MS while your gauge is reading much richer.

Sorry if i am not understanding the issue correctly, this is just my personal install/troubleshooting experience.

 

I understand what you had happening and what you did to fix it, but that wont work for me.

When i check the brown wideband output wire from LC-1 with a voltmeter what it gets for voltage it is the same that the ecu signal wire gets, but the DB gauge signal wire has a smaller voltage reading, which is why it reads richer for its display of afr.

Based off how the car runs, the tuner studio afr gauge is correct, it has the correct reading. If i try and idle at 14.7 i get a slight miss every few seconds and at 14.0 its smooth (batch fire and rx7 460cc). So at the same time when tuner studio gauge shows 14.7 DB gauge shows 13.7 or somewhere around there it seems that the voltage to it fluctuates. Like i said when driving and i overrun cut i will see the DB gauge show anywhere from 20.5-21.1 for its full lean reading, but the tuner studio gauge always shows 22.33 for full lean.

 

Anybody have any ideas?

The DB gauge is not getting the full voltage signal from LC-1. While i drive the full lean reading changes from 20.0-21.1. While tuner studio is always showing 22.33 full lean.

So if the DB gauge reads full lean at say 21.0 at a certain time that means its 1.33 afr off from what tuner studio is, so then during cruise if tuner studio shows 14.7 the gauge will show 13.4 afr.

Gauge ground, lc-1 heater and system ground wires all ground together at ECU ground by head.

 

Some what fixed....i noticed on the DB gauge ground wire that the copper wire itself had some black coating on it which caused a bad connection. Sanded the black off as many little wires as i could down to bare copper, reconnected and it now reads 21.6 full lean always. So closer to what tuner studio has, may replace the whole wire and see if that evens the readings out, or this may be as good as it gets and the custom linear trick is whats needed to even them out.