help coding 2001 b5 a4 ecu (have tried every writeup on it)

**tojr1088** · 01-02-2012 09:07 PM

i have a ch box ecu for my 1.8t and the car runs fine with eurodyne meastro. but i cant code the ecu from the current soft coding of 07500. its obviously coded as a vw front wheel drive 1.8t......i need it coded to a b5 a4 quattro and it wont let me do it....

could i need an immobilizer defeat to make it work.....the only digit that will change is the 5 to a 4 and back again thats it!

i have a registered vagcom and am hoping i dont need a different ecu. car runs great otherwise. any help would be awesome

**biketsai** · 01-02-2012 09:12 PM

You should be able to do it with Vagcom, we dont have immobilizers.

**Seerlah** · 01-02-2012 09:13 PM

B5s sold in the US did not come with immobilisers. Not sure on the VW platform.

**tojr1088** · 01-02-2012 09:20 PM

Originally Posted by Seerlah

B5s sold in the US did not come with immobilisers. Not sure on the VW platform.

just realized ch box ecus are only a4 b5.......but anyways yea i figured we didnt have immobilizers......but vagcom wont let me change coding except the middle number.....shouldnt a b5 a4 non auto be like 16201 or 06201 or something.....why is mine 07500

**colony7** · 01-02-2012 09:39 PM

what code are you trying to change and why? if it runs fine why mess with it? i didnt have to change anything on mine for maestro, and if its a manual transmission ecu, then it should be fine

**Seerlah** · 01-02-2012 09:47 PM

You sure the last numbers before it reads CH is 018? I can check my Vag Com tommorow for the soft coding, if you can wait.

**tojr1088** · 01-02-2012 09:48 PM

its just that my speed is off a lil and i dont know if its because the ecu is coded for a 5 speed instead of a 6 speed......i have the 1.8t swapped into an s4 i bought without a motor for dirt cheap........and also i think my abs communication code is also maybe part of the softcoding

**colony7** · 01-02-2012 10:06 PM

the transmission doesnt have anything to do with your speed being off, the size of your wheels/tires does

**tojr1088** · 01-02-2012 11:24 PM

Originally Posted by colony7

the transmission doesnt have anything to do with your speed being off, the size of your wheels/tires does

your sure.....because the speed sensor is on the transmission and sends info to the ecu.....are u implying that the 6 speed has the same sensor as the 5 speed and has the same signal and gear speed as the 5 speed? cause thats the signal going to the speedometer

**tojr1088** · 01-02-2012 11:27 PM

and come on man.....i know the wheel and tires affect speed.....im asking about coding and why it wont work. not the factors on my speed being off. wheels and tires are stock anyways.

**walky_talky20** · 01-03-2012 06:49 AM

Originally Posted by tojr1088

are u implying that the 6 speed has the same sensor as the 5 speed and has the same signal and gear speed as the 5 speed? cause thats the signal going to the speedometer

Yes, the 5-speed and 6-speed use the same exact speed sensor. And the measured speed is coming from front diff ring. Nothing to do with the internal gears - it has to do with road speed and tire size.

**tojr1088** · 01-03-2012 12:28 PM

Originally Posted by walky_talky20

Yes, the 5-speed and 6-speed use the same exact speed sensor. And the measured speed is coming from front diff ring. Nothing to do with the internal gears - it has to do with road speed and tire size.

thanks alot thats what i wanted to know......guess ill just leave the coding and deal with the missing message from abs code which doesnt affect anything anyways....

**carel** · 05-24-2016 03:19 AM

hey can you help me i need to reconfigure my ecu

**Nollywood** · 05-24-2016 03:46 AM

Originally Posted by carel

hey can you help me i need to reconfigure my ecu

From what, to what?

You'll need to give more details - model and year of your car, auto or manual, FWD or Quattro. Small details, big difference.

**carel** · 05-24-2016 03:48 AM

Sorry I have a 1999 vw passat 1.8t 20v Aeb motor triptronic box I am busy to put a manaul gearbox in

Sent from my D5503 using Tapatalk

**walky_talky20** · 05-24-2016 07:00 AM

I could be wrong, but I'm pretty sure the AEB computers cannot be recoded like this. You have to either change the computer, or reflash the EEPROM with a manual file.

EDIT: I think I'm wrong on this. Recode should be possible for at least some of the AEB ECU's. However, if the ECU is chipped, sometimes recode ability is locked out.