Procede Harness, O2 Signals

scalbert · 08-31-2007, 05:16 PM

I was just looking at the Procede harness (actually uploading V1.47 on a bench and no, it is not installed yet) and noticed that for what I assume are the O2 signal leads, there is only a single connection to the Procede. I was expecting this to be a In/Out configuration like what is being done with the Crank and MAP signals but appearently is not the case.

Obviously it works but I was curious how. My assumption would be that a variable or mux'd in resistance is added pulling down the signal when desired; most likely causing the ECU to think it is leaner and add fuel accordingly. But wondered if anyone else had some across how this is being done.

Just curious as I like to understand these types of things prior to installing them.

scalbert · 09-01-2007, 08:39 PM

Come on Shiv, how about a small indicator, no specifics as I am truly curious and will be placing an order to further the Procede install on Tuesday.

scalbert · 09-01-2007, 08:40 PM

Also, any tail pipe A/F ratio tests done for comparison? I will be going out in the mornign to do some logs with my LM-1.

scalbert · 09-02-2007, 11:17 PM

Quote:

Originally Posted by Tang

The O2 is a current based system. So you pull current out to richen it up, put current in to lean it out. The trick is in how much current you pull out or put in.

Somewhere in your harness there are two ~3.3k resistors that separate the right and left signal, which then go in to a single analog channel on the interceptor box.

Ah, got it now. Voltage is applied/reduced with a set resitance to vary the current and to get the desired A/F ratio. Makes more sense now as a variable resistance (not a decade box) value isn't as easy nor expected in this type of device.

NikAmi · 09-02-2007, 11:20 PM

Nooooo....don't listen to him! It's all lies! Lies I tell you!

scalbert · 09-02-2007, 11:24 PM

Actually, not lies in this case I suspect, as there is nothing to gain and now makes more sense. Plus, the name-that-should-not-be-mentioned has nothing to impress or persuade me with.

I also forgot about reading about the wideband units being current based which now makes adds up. For me, this is all I wanted to know as I knew an analog channel was used and before it did not click. And once again, was just curious.

08-31-2007, 05:16 PM	#1
scalbert Major General 158 Rep 5,776 Posts Drives: '13 S4, '15 Q7 Join Date: Feb 2007 Location: Woodstock, GA iTrader: (8)	Procede Harness, O2 Signals I was just looking at the Procede harness (actually uploading V1.47 on a bench and no, it is not installed yet) and noticed that for what I assume are the O2 signal leads, there is only a single connection to the Procede. I was expecting this to be a In/Out configuration like what is being done with the Crank and MAP signals but appearently is not the case. Obviously it works but I was curious how. My assumption would be that a variable or mux'd in resistance is added pulling down the signal when desired; most likely causing the ECU to think it is leaner and add fuel accordingly. But wondered if anyone else had some across how this is being done. Just curious as I like to understand these types of things prior to installing them.
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09-01-2007, 08:39 PM	#2
scalbert Major General 158 Rep 5,776 Posts Drives: '13 S4, '15 Q7 Join Date: Feb 2007 Location: Woodstock, GA iTrader: (8)	Come on Shiv, how about a small indicator, no specifics as I am truly curious and will be placing an order to further the Procede install on Tuesday.
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09-01-2007, 08:40 PM	#3
scalbert Major General 158 Rep 5,776 Posts Drives: '13 S4, '15 Q7 Join Date: Feb 2007 Location: Woodstock, GA iTrader: (8)	Also, any tail pipe A/F ratio tests done for comparison? I will be going out in the mornign to do some logs with my LM-1.
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09-02-2007, 11:20 PM	#5
NikAmi Enlisted Member 4 Rep 32 Posts Drives: Audi A4 3.0 Cabriolet Join Date: Jul 2007 Location: Bethlehem, PA iTrader: (0)	Nooooo....don't listen to him! It's all lies! Lies I tell you!
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09-02-2007, 11:24 PM	#6
scalbert Major General 158 Rep 5,776 Posts Drives: '13 S4, '15 Q7 Join Date: Feb 2007 Location: Woodstock, GA iTrader: (8)	Actually, not lies in this case I suspect, as there is nothing to gain and now makes more sense. Plus, the name-that-should-not-be-mentioned has nothing to impress or persuade me with. I also forgot about reading about the wideband units being current based which now makes adds up. For me, this is all I wanted to know as I knew an analog channel was used and before it did not click. And once again, was just curious.
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