[Levan-i]

So,

I've not plugged in rear O2 Sensors,
I've disabled :
2C77
2C78
2C7B
2C7C
values to 00 in tunerpro and flashed but now i get
2C7F (AfterCat O2 sensor trim control, bank 2) and 2C6A (AfterCat O2 Sensor switched) errors

what else should i do in bin?

[ferocity02]

I've been told by a few reputable people that you must leave the rear O2 sensors installed and plugged in or else it will lead to incorrect fuel trims. Personally I find this hard to believe since they are narrowband sensors and should only care about c@t performance and not affect fueling. But I'm not an expert.

[kenjermen]

One way to leave the o2 sensor in and not worry about faults is to get the o2 bung spacers. They lift the sensors out of direct air flow simulating that you have cats. Plus these spacers are cheap you can get them off of eBay for $12

[Dmac @ BMS/DMD]

Been running with my rear O2s unplugged from the DME for awhile now on 32psi.

What I did:
Remove pins 19 and 20 on the small black subconnector
Code out 2C9E and 2C9F in the flash

These codes weren't available in the public XDFs so I had to add their definitions in myself. Let me know if you have any questions.

[Levan-i]

Dmac

These codes weren't available in the public XDFs so I had to add their definitions in myself. Let me know if you have any questions.

sounds as solution

how you you did that?

[3000GT MR]

Originally Posted by Levan-i

Dmac


sounds as solution

how you you did that?

Take your a code that you have. We'll use 2C9F as the example. Swap the first and second 2-bit so it will be 9F2C (dont ask) find it in your .bin hex. All the engine codes are in a general area. Once you find it count up 15 2-bit hex spaces. There will be a number surrounded by zeros. It will be either 56,22,11,00. Take that hex address and plug it into the XDF in TP as a toggle. Then you can shut it off by changing the number to a 00 or 11 depending on what it is. Typically the "on" toggle for O2's is 56 so you would change that to a 00 to turn that particular toggle off.

[Levan-i]

Originally Posted by 3000GT MR

Take your a code that you have. We'll use 2C9F as the example. Swap the first and second 2-bit so it will be 9F2C (dont ask) find it in your .bin hex. All the engine codes are in a general area. Once you find it count up 15 2-bit hex spaces. There will be a number surrounded by zeros. It will be either 56,22,11,00. Take that hex address and plug it into the XDF in TP as a toggle. Then you can shut it off by changing the number to a 00 or 11 depending on what it is. Typically the "on" toggle for O2's is 56 so you would change that to a 00 to turn that particular toggle off.

thank you very much!

as i see, in my case the numbers are at 5th hex couple bits not 15th somewhy,

now trying to figure out how to add it to definitions, where do i get unique id from

I've got
2C7E at 5A184
2C7F at 5A198
2C6A at 58604
2C9E at 59158
2C9F at 5916C

[jyamona]

Originally Posted by 3000GT MR

Take your a code that you have. We'll use 2C9F as the example. Swap the first and second 2-bit so it will be 9F2C (dont ask) find it in your .bin hex. All the engine codes are in a general area. Once you find it count up 15 2-bit hex spaces. There will be a number surrounded by zeros. It will be either 56,22,11,00. Take that hex address and plug it into the XDF in TP as a toggle. Then you can shut it off by changing the number to a 00 or 11 depending on what it is. Typically the "on" toggle for O2's is 56 so you would change that to a 00 to turn that particular toggle off.

The reason you need to swap the bytes is because everything in the DME uses LSB (least significant byte first), where as reading the code normally is MSB (most significant byte first) aka. it's even more of a pain in the ass to think this way.

This is also sometimes referred to as LoHi vs. HiLo

[Levan-i]

Thanks Jake,

also take a look at you thread also pls

[enrita]

Originally Posted by Dmac @ BMS/DMD

Been running with my rear O2s unplugged from the DME for awhile now on 32psi.

What I did:
Remove pins 19 and 20 on the small black subconnector
Code out 2C9E and 2C9F in the flash

These codes weren't available in the public XDFs so I had to add their definitions in myself. Let me know if you have any questions.

This and no issues

[marconi118]

Code out 2C9E and 2C9F in the flash

These codes weren't available in the public XDFs


how to add this to the xdf?

[3000GT MR]

Originally Posted by jyamona

The reason you need to swap the bytes is because everything in the DME uses LSB (least significant byte first), where as reading the code normally is MSB (most significant byte first) aka. it's even more of a pain in the ass to think this way.

This is also sometimes referred to as LoHi vs. HiLo

Thanks now you F'ed me all up. Why couldn't you just leave my simple thought process alone.

[Levan-i]

:D

[Dmac @ BMS/DMD]

Shiv made a video showing how this works. Here's the video link.

http://youtu.be/mA87hWbGaVU

Disclaimer: DO NOT ATTEMPT THIS UNLESS YOU KNOW EXACTLY WHAT YOU ARE DOING

[Levan-i]

thanks to Shiv for the video!

but strange thing is that, values in my bin are not 15th byte but 5th,

maybe it is the difference in IJE0S and I8AOS?

[DV135i]

If you were to do this, would you be able to achieve o2 readiness?

[Levan-i]

"o2 readiness"?
whats that?

[DV135i]

Originally Posted by Levan-i

"o2 readiness"?
whats that?

Something they check for when you get your car smogged.

[quing]

Can this be added to the XDF??

[jyamona]

Originally Posted by quing

Can this be added to the XDF??

It is in the XDF. There is now a DTC Master table where you can toggle ANY code.

[quing]

Originally Posted by jyamona

It is in the XDF. There is now a DTC Master table where you can toggle ANY code.

Thank you!!

[omarmarji]

giving this a try, thx! but snipping the wires from the pins going to the DME, is the necessary ?

[prelude2perfect]

Bump for an answer ^

Keep getting code 2c9f and would like to disable instead of buying a new one

[Torsion]

Originally Posted by omarmarji

giving this a try, thx! but snipping the wires from the pins going to the DME, is the necessary ?

DO NOT SNIP, The pins can be removed easily with a small screwdriver push in on the side and pull the pin out

[omarmarji]

has anyone had problems with this yet? any fuel trim defects?