Hi Guys,

Firstly - sorry I keep having to post off topic, but the innovate forums are pretty low traffic

This is in relation to the LC1 install:

Can I run a SINGLE dedicated ground wire (say 12AWG) FROM my ECU ground point (or a spot near to the ECU ground on the chassis) to my heater AND signal wire?

OR must both signal and heater wires be SEPARATE until they get to the lug bolted to the chassis?

The more I think about this the more I assume that they need to be seperate - I mean the heater clicking on/off would cause a current change on the combined ground wire - which the signal part of the LC1 wouldn't like!

Thoughts?

Cheers
David

 

Hrmm from the "Ground offsets 101" thread on innovate forums

So yes, I should use separate ground wires for both the heater/system wires. Otherwise the heater behaviour will affect the system.

Unless of course I could have a single ground wire so THICK and SHORT that the resistance was effectively 0 Ohms

 

sell it and buy a uego

Sorry, i can't help with this.

 

A single fat wire (my though is 10 awg) will work fine if you solder everything up.

 

you should never solder wiring in a automotive application

 

I completely disagree.

 

+1
How do mitsu creates ECU without soldering?
But I believe you wanted to say be carefull what temperature soldering can withstand, I would agree on that.

Back to the topic: grounding of heater(power) has to have less or equal resistance than the sensor signal grounding. Then you should be OK.

 

Hey tephra, the seperate ground isn't super important, only for ground offset voltage. Mine has been wired all grounds to 1 without any problems. I used the radio ground, which is the same as grounding to the dash frame. No difference in afr readings with it grounded this way

 

you may. but it is an industry wide implimented practice.
I don't think there is 1 main stream manufacturer that solders any joints in wiring looms.
its well discussed and documented

 

that doesn't mean it doesn't work. I have never had any issues with any solder joints. The only time i have found soldering an issue is when dealing with O2 sensors.

Any splice can cause cause resistance issues but i assume solder, when done properly, would cause the least resistance.

And, i absolutely have seen factory solder jobs in my sentra. They are terrible.

 

Klaus says to use seperate grounds. I at first used one then changed to two both connected to the engine block.

 

I used the ecu ground wires as a ground point for the small gauge system wires and the chassis as a ground for the heater ground. All the wires tie in behind the glove box. And yes they are soldered into the main loom. Its a permanent install Did it right the first time. No problems almost 2 years later. Just let the sensor warm up before starting the engine!!!

 

tephra to overcome LC-1 grounding problems, maybe one can use Bosch CJ110 instead, OEM 0272230640, 0272230345 .
I believe they know their sensors better than any WB controller manufacturer. Then one could wire it in to ADC pin and implement ADC/AFR table conversion within the ECU - no need of serial communication for any purpose anymore.