Need help! ECU thinks I have an automatic transmission.

[CyberPMG]

Everything was put together for my big turbo build. When running the motor, I'm getting 4 HARD codes that is throwing a CEL. 3 of the 4 codes looks as though it's looking for a TCU. That's fine if I have an automatic transmission, but I have a manual transmission. This is the spare ECU I bought to have coded for the big turbo software. I think the original A4 for that ECU was an automatic.

Here's the scan:

******************************************************************************-
Address 01: Engine Labels: None
Part No SW: 8E0 UNI 518 BT HW: 8E0 909 018 A
Component: 1.8L R4/415 G 0003
Coding: 0016751
Shop #: WSC 13873 410 452294

2 Faults Found:
18034 - Powertrain Data Bus: Missing Message from TCU
P1626 - 004 - No Signal/Communication
18320 - Pressure Sensor for Brake Boost (G294): Short to Plus
P1912 - 001 - Upper Limit Exceeded
Readiness: 0110 1100

******************************************************************************-
Address 03: ABS Brakes Labels: 8E0-614-517.lbl
Part No: 8E0 614 517 A
Component: ABS/ESP allrad 3429
Coding: 04275
Shop #: WSC 06435

2 Faults Found:
18055 - Check Coding of ECUs on Powertrain Data Bus
P1647 - 35-00 - -
18034 - Powertrain Data Bus: Missing Message from TCU
P1626 - 35-00 - -

******************************************************************************-

Does anyone know what coding needs to be done to let the ECU know I don't have a TCU? Also, any ideas on the Pressure Sensor to the Brake Boost?

[Pufftrees]

I think the ecu needs re-tuned. IIRC im not sure there is a way even with VAG-com to fix that one.. that blows

[dougyfresh]

what's the ECu p/n?

Judging by what John (diagnosticator) said in Tyler's 3.0-1.8 thread I think you have to recode the ECu. I think this can be done with VAG-Com. PM John and ask him. Report back the details (or PM me) please.


Why did you go with Unitronics for a GTRS?

[CyberPMG]

This is the ECU P/N : 8E0 909 518 AK

The eBay listing didn't mention if it had an automatic or manual transmission. Only that it would work on any 1.8T engine.

[EBG 18T]

e-mail clint @ rai. he seems to be the customer service guy for all the uni issues..

[Matt@EuropaParts]

I poked around in ETKA a bit...that part number has been superseded to 8E0 909 528 GX (it's noted), but they come up as the correct ECU for my car when I plug in my VIN, and my car has a 6-speed manual transmission and quattro. Not sure if that helps at all...

[A4 TSCHUSS]

Why did you go with Unitronics for a GTRS?

Why not? People that have are all happy with the performance.

[hercfe]

What is the soft code for the engine? Specifically, what is the fourth digit in the soft engine coding? xxx?x

[CyberPMG]

coding is showing up as 0016751

[AudiFan6482]

Select 76 (Parking Aid)
Coding -> Function 07
00x?xxx: Transmission

0 - Manual Transmission
1 - Automatic Transmission

Select 03 (Brake Electronics)
Coding -> Function 07
0xxx?: Transmission
5 - Manual
7 - Automatic (5HP19, 5HP24, AG4, AG5)
9 - Multitronic

Need a real hex cable to do these/ a dealer can also do it for you, replace the ? with the number for manual trans and you should be good to go

[AudiFan6482]

What is the soft code for the engine? Specifically, what is the fourth digit in the soft engine coding? xxx?x

yes make sure this one is correct too

Select 03 (Brake Electronics)
Coding -> Function 07

0xx?x: Engine

5 - 4/6 Cyl. Diesel
7 - 4/5 Cyl. Gasoline
9 - 6/8 Cyl. Gasoline

[AudiFan6482]

from my two posts you can see that the Transmission coding is in the brake electronics which should explain your brake fault codes.

[CyberPMG]

Thanks! Have the full Hex cable, so I've passed this along to get checked/set.

Will report back after rechecking.

[CyberPMG]

Update: only needed to change the engine code. It was set to 16751 which breaks down to:

16 = US country code
7 = quattro w/ ESP
5 = automatic transmission
1 = ECU installed in an A4

Changed the code to 16701. The 0 = manual transmission. All codes are now gone!

[AudiFan6482]

glad i could help. How is the upgrade have you run it on a dyno yet?

[CyberPMG]

The upgrade is a huge improvement over the K04 setup I had. I'm about 98% completed with the build and expect to have the rest done in 2 weeks. I don't have any reliable AWD dynos in Northeast Ohio. Once everything is done and complete, I will be looking around for one. I'm getting 22-23 psi peak boost which is just fine.

[dougyfresh]

Update: only needed to change the engine code. It was set to 16751 which breaks down to:

16 = US country code
7 = quattro w/ ESP
5 = automatic transmission
1 = ECU installed in an A4

Changed the code to 16701. The 0 = manual transmission. All codes are now gone!

awesome. thanks for the input.

[dougyfresh]

Why not? People that have are all happy with the performance.

because there is no reason to when REVO has a flawless programming for the GTRS.



I haven't seen performance that is above and beyond from an unitronic tuned car yet. I also have not seen any flawless operation from any unitronic tuned car. Each car has some small problem whether its cold starts or hot restarts or other stuff like that. Stuff no one posts up about on the forums but if you talk to owners on the phone or in person they'll admit to it.

[CyberPMG]

I chose Unitronic because of local support. That's basically the main reason - local support in case anything goes wrong. I won't hide any issues in hopes that the more it's brought forward, the issue can be addressed and resolved to help everyone.