Ecu pin out

[Jeff V.]

This is the post he's working from. I'm not even sure what this part means.

As far as chrome goes. Yes just solder that 0-5v wire in to pin 55 for your ecu. You will likely need to scale the readings in chrome as well which can be found most of the way down the list as Sensor Scaling and will include the wideband (93) and map (92) maps.

Stock chrome setup is:
0.00 7.0
1.00 10.2
2.00 13.4
3.00 16.6
4.00 19.8
5.00 23.0

You need to change those numbers to:
0.00 10.0
1.00 12.0
2.00 14.0
3.00 16.0
4.00 18.0
5.00 20.0

I've never run a Chrome ROM in anything, and it's probably been a couple years since I even opened one up. I have no idea what changes Greg made to the O2 sensor tables. But I can't even begin to imagine how the table posted above would even work.

Stock O2s are 0-1 volt. So how could the "stock Chrome setup" even have 0-5v values to begin with? If he set up some bit to toggle between 1 and 5 volt inputs, then that should have been mentioned in the post.

Either way, if all you want to do is log the wideband, you don't need Chrome or even a flash ECU. It can all be done in Evoscan via a different ECU pin.

[DCIV]

Yes, all I want to do is log!

How do I make another pin work? I have multiple with leads coming out that were cut off.


Coop

[DCIV]

[quote=""aaronatstate""]Pin 55 is fuel pump relay 2 on a 99 ECU, but its the front O2 on a 1G ECU.

Your adapter harness takes care of this...If you trace Pin 55 from the 99 ECU back through your adapter harness it will not go to Pin 55 on the car...[/quote]

I know this. I have the pin out changes of what goes to what. The issue I have with what they are doing is that my Wideband is at the merge. It would not work well for the front or rear bank then.

I thought it was the 99 side of harness as well till I read that they were scaling the narrow bands and realized that’s not what it is.

Coop

[Jeff V.]

You should be able to use the fuel tank pressure input pin. Do you have any wires connected to pin 93 on the ECU side?

[DCIV]

This is from blackstealth, antero is his name,
“Evoscan can only read WBO2 a couple ways:
1. Through a serial cable attached to WBO2 controller (if it supports it)
2. Flash ECU (unused pin 91-93 on 98-99 ECU). Forget exactly which pin it is.
3. Unused EGRT pin 53 (on 1st gen ECU).
4. Through LCDBC, see my LCDBC manual on how to do this.”


Coop

[aaronatstate]

http://chromedecu.org/?page_id=1571

Any wideband O2 with a 0-5v output can be used.

The Innovate LC1 and AEM Uego are great examples of WBO2 sensors that work great with the Flash Ecus.

After following installation instructions for your choice sensor you will need to wire the 0-5V output (see your WBO2 sensor manual for wire color) into the ECU.

Wire the 0-5V into pin 93 for a 98-99 Flash Ecu, pin 55 for a 91-93 Flash Ecu or pin 77 for a 94-97 Flash Ecu.

Then just finish your sensor scaling in the rom and you are set up. http://chromedecu.org/?page_id=895

Since you have an adapter harness and not the plug and play ECU from Adam, you need to follow all instructions for a 98-99 ECU

[DCIV]

If I’m looking at it correctly Aaron, then pin 55 is o2 sensor. Makes sense to use that. BUT! My Wideband is at the merge, where it’s suppose to be, and this would not give good readings for either bank. Now if I took the Wideband and put it on a stock location then I would be okay with all of this but surely there is another way.


Coop

[aaronatstate]

[quote=""DCIV""]If I’m looking at it correctly Aaron, then pin 55 is o2 sensor. Makes sense to use that. BUT! My Wideband is at the merge, where it’s suppose to be, and this would not give good readings for either bank. Now if I took the Wideband and put it on a stock location then I would be okay with all of this but surely there is another way.


Coop[/quote]

Did you even read the link I posted, or any of what Jeff posted?

If you want to log a WBO2, you need to use pin 93 on the 98/99 ECU. Pin 55 from a 1G harness goes to pin 72 on a 98/99 ECU through the adapter harness. This is for the stock narrowband which is 0-1V, where as pin 93 on the 98/99 ECU can read the 0-5V that a WBO2 puts out.

So there are again two options which have been posted before. They are as follows:

• Log WBO2
  Connect 0-5V WBO2 wire to Pin 93 on a 98/99 ECU
• Replace Narrowband with WBO2
  Connect 0-1V WBO2 wire to pin 55 on 1G harness (goes to pin 72 on 98/99 ECU)
• Do Both Options
  Connect both WBO2 wires to the pins above to replace Narrowband with WBO2 and log it

[DCIV]

Jeff and I have been texting so sorry if I did not relay this correctly. I don’t have a wire coming out of 93. It’s empty.

Coop

[Jeff V.]

I think you're getting confused over something very basic here.

If you just want to LOG it, then there's several ways to do that. Pin 93, direct to the LCDBC, etc. Which wideband do you have? My Innovate WB02 can be logged directly in Innovate's software via a special cable that came with it.

None of that has anything at all to do with where the O2 is located. It could be clamped into your exhaust tip. It doesn't matter.

Now if you want to REPLACE one of your narrowband O2s, then everything changes. Placement becomes important, your flash needs to change, your EvoScan logs need to change, and you'd connect it to pin 55 or 56.

Once again, I'll ask what are you trying to DO? If your wideband shows 12:1, are you going to start tweaking fuel and injector tables like crazy and just hoping something works? Or do you have a plan?

[DCIV]

I want to start tuning it. I want to be able to send my tune out. I want to log that Wideband. Simple.

I have an aem Wideband.

I don’t have a wire out of pin 93. I could add one. What a pain it was to swap the pins for the narrow bands I don’t know if that’s what I wanna do.

No I don’t wanna swap the stock narrowband, not only is mine already routed, it also where a Wideband should be.

Coop

[stealthee]

Changing your tune isn't going to fix things until you figure out why things are the way they are right now.

[DCIV]

[quote=""stealthee""]Changing your tune isn't going to fix things until you figure out why things are the way they are right now.[/quote]

Cars running fine, Wideband shows more normal than ever! As far as I’m concerned whatever the problem is, is in the tune.


Coop

[ChargerX3]

Oh Coop...

[aaronatstate]

[quote=""DCIV""]I want to start tuning it. I want to be able to send my tune out. I want to log that Wideband. Simple.

I have an aem Wideband.

I don’t have a wire out of pin 93. I could add one. What a pain it was to swap the pins for the narrow bands I don’t know if that’s what I wanna do.

No I don’t wanna swap the stock narrowband, not only is mine already routed, it also where a Wideband should be.

Coop[/quote]

If there is no wire in pin 93 right now, buy a damn pin online, solder the AEM 0-5V wire onto and push it in. It’s a lot easier installing that removing.

[DCIV]

Contacted Adam, he’s gonna swap it out with a plug and play for a small fee. I think this will take away one whole issue.


Coop

[aaronatstate]

[quote=""DCIV""]Contacted Adam, he’s gonna swap it out with a plug and play for a small fee. I think this will take away one whole issue.


Coop[/quote]

Still not gonna have the pin for wbo2. You’ll have to install it. I think Adam typically sends extra wires for that.

[DCIV]

Correct. I have to instal that. But I’ve never felt good about this harness. Everything now is just more streamline. I just realized I’m not even using the v2.1 or whatever if chrome either. I’m using just v2. Wonder if that’s part of my issue?

Coop

[DCIV]

So I was getting very confused by this whole plug and play flashed ecu for quite a while and here is why.

My old set up I used the tatrix and a single wire flashing connector that came out the back of the tatrix. That’s what I was use to, two ports.

Well with this new set up, you put two pins in the obd 1 port and you don’t have to worry about the single wire connector. And so basically I lose having to fool with that. Just none of the picture or anything was making sense when I was looking at it all.

Coop

[DCIV]

Got everything installed.

Go to flash my info on it...will not read it. Crap.

Double check wiring...it's all good....go to update ecuflash. Now I've forgotten all about these xml files and how to do them.

I've gone down a dark hole and I don't know if I'm coming out the other side people!!!!


Coop