LC-1 Grounding question

[tinindian]

I'm getting conflicting info on grounding for the LC-1. The EFILive tutorial says the heater ground (blue wire) should be connected to a chassis’ ground separate from the signal ground location (white wire). The LC-1 manual says all grounds should be tied together, in fact soldered together. Which one is correct? Thanks.

[joecar]

First try it with the white wire simply connected to the FlashScan AD- input...

i.e. don't ground it...

see what the signal looks like (connect the brown or yellow signal wire (whichever one you're using) to AD+)...

run in closed loop and you should see stoich AFR.

[ the white wire is supposed to come internally "grounded" inside the LC-1. ]

Do you have FlashScan V1 or V2...?

[mr.prick]

The white wire is a -1v and will reek havoc with the AD input readings if connected to Flashscan.
I've got the blue wire grounded to the engine block and the white wire to chassis.

[joecar]

Innovate told me the white and green wires are internally connected... so I don't know... I have always observed my white and green wires are at about 0.1V wrt chassis.

[tinindian]

I have FlashScan V1 and a 6-wire LC-1 that doesn't have a green wire (no analog ground).

[mr.prick]

You're right Joe it's -0.1v like the low signal of the NBO2's.
I never measured the green wire but I know that the white wire connected to
Flashscan is going to make all the ADs bounce the green wire alone does not.

[joecar]

He doesn't have a green wire... can he use the metal shield...?

[mr.prick]

For the analog ground?
I think the lining is just to keep the noise down in the LC-1. :nixweiss:
I'm thinking something like this:

[joecar]

That schematic should work.

[tinindian]

So you're saying DON'T tie the Flashscan V1 analog ground (pin D) to the heater ground & LC-1 ground?

[mr.prick]

Yes.