Good afternoon!
I was fortunate enough to buy a custom quad gauge from John Bell for my '80SC. It's all conceptually straightforward, but the difficulty is in the details, particularly the oxygen sensor wiring. Help me out here.
So here is the wiring diagram for the Lambda system
At Rob's suggestion, I have an Innovate LC-2 interface box. with the following wires to be connected.
- Red to +12V, proposed terminal 30 on the frequency valve relay
- Black to ground, proposed FRV relay terminal 85, (also to gauge?) (also to Lambda box terminal 2 or 4?)
- Yellow (0-5 V) to gauge
- Brown (0-1 V)to lambda box terminal 2 or 4....
This is where I am stuck. The wiring diagram shows the oxygen sensor connecting to the Lambda box terminals 2 and 4 through what looks to me like a coax cable. The LC-2 has a single wire for the low voltage output.
- which pin should the yellow wire connect to, 2 or 4?
- should something else be connected to the other, unused 2 or 4 pin, like a ground?
- where is the best place to connect these wires? In the engine bay connector, or open the Lambda box connector somehow?
You might get the impression I'm over my head, and your impression would be right. But I'm still having fun and learning stuff so I'll press on.
