Hello all,
I'm currently installing a fuel control system in my '87 Peugeot 505. I have added an Innovate LC-2 O2 sensor. I'm using the MSII V3 mainboard with a relay board. Unlike the LC-1, the LC-2 only has one ground wire. I am aware that sensor grounding can be a sensitive factor, and noise should be eliminated wherever possible. This presents a quandary with the 1 ground wire setup: I don't want to introduce a relatively high-current ground into my quiet sensor ground line, so I have grounded the O2 sensor at the Engine ground terminal on the Relay board.
On the other hand, I know that it is important that the LC-2 O2 sensor portion have the same grounding potential as my Megasquirt. It does tie into my Megasquirt's ground pool eventually, but certainly doesn't pass through the ground plane in the MS.
Why has the LC-2 moved to a single ground wire? In the instructions for the LC-2, they say to ground to the battery terminal - which I have <0.5 ohms resistance to the battery terminal at my engine ground point, so I think I'm OK there. I'm just worried about sensor grounding potentials lining up.
Maybe I'm just worrying too much!
Wade
LC-2 Wiring to Relay Board
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Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.
If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0).
If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days
The full forum rules are here: Forum Rules, be sure to read them all regularly.
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Matt Cramer
- Super Squirter
- Posts: 2951
- Joined: Sat Jul 03, 2004 11:35 am
Re: LC-2 Wiring to Relay Board
It's best to ground the LC-2 to the battery, not the relay board. Apparently the three ground wires in the original LC-1 caused too much customer confusion.
