NefMoto

both ecu's are used on the Beetle 1.8T , and internally they look different. But is it possible to use the 1024kb ECU on a car currently running the 512kb ecu ? Any info welcome as I have a hard time sourcing an older 512kb ECU.

Fan control is not the same, your throttle won't work, no vvt, 1024 is wideband lambda and 512 is narrowband. Aph is a strange one. Ecus are the same as the narrowband 180 tt fwiw.

It is not so hard to convert it to 1024 kb ECU

My car was 512kb ECU (narrowband), and I converted to wideband (1024kb).
It is very easy.

Some are easier then others. Depending of the ecu is configured to power the other half of itself or not and if the harness supports that or not. Sometimes you need to supply power to the small plug on the ecu and the cooling fans will run strange wiring would need to be fixed for proper operation. Proper ecu calibration including mad offset or use the wideband maf, injectors, vvt  delete, wiring in a new lsu4.2 wideband lambda. It's not hard to convert but to do it proper is far from just swapping ecus, also don't forget about the immo

Some (a4 chassis) variants are easier then others a beetle aph is a little more involved then other variants

You also get some unique non standart hybrid stuff specifically in europe. Things like the NA 1.8, its 512kb , narrowband with newer lambda, newer maf with reverse flow mapped and 3 inch mouth to 2.75 inch body , VVT , dbw etc.

Narrowband MAF can go on wideband ECU without any change or calibratio. That was my case converting APY engine to wideband.
But is it posible to make ESP to work when converting to wideband?

In my case (from 032S ECU to 032HP ecu) the MAF calibration is different. Not equal.

Thx for the many replies and info.

I gave it a shot, just tossed in the 1024kb ECU with IMMO-offed e2p, as an experiment

Car : New Beetle 1.8T APH Automatic with 512kb ecu : 06A906032A  3157  (ecu died)

Replacement ECU : 1024kb ecu with software 06A906032FS  3995  (new Beetle 1.8T AWU)

Car starts and idles ok, 2 faults are sticking :

17070 ECM Power Relay Control Circuit
P0686  -  35-00  -  Short to GND

17746 Camshaft Position Sensor (G40)
P1338  -  35-00  Open or Short to Plus


This is an APH , so the strange one according to Marty in a comment above.
I have a 512kb ecu on its way, should have it in a few weeks, but now i'm interested in making this work a bit better. There are also more definition files to be found on the 1024kb versions.

I need to lookup following statements, :
So I guess the APH does not have VVT
It is DBW and im not certain but it might be Wideband already.
What else is special about this engine compared to the other 512kb ecus.

So I am looking at wrong Fan Control and the above issues from VCDS

Info I found on the APH (credit goes to VWVortex and their members for the info below):

APH engines have a "baby" K03 turbo--not same as Golf and TT
APH engines have the 2L exhaust (2" vs the 2.25" normally used)
APH engines have a smaller Intercooler (even smaller than Golf part). Less air through turbo = less boost.
APH engines have Small Injectors, and 3 bar Fuel Pressure Regulator (sufficient for 150HP that’s it; maybe 160 max.)
Injectors APH, 281.78cc/min@45psi (instead of the normal 317cc/min)

it has several tuning issues to be overcome:
1. No real grill work for good airflow to engine.
2. Smaller injectors then AWD motors of the same production year.
3. Smaller exhaust manifold than AWD motors of the same production year.
4. Hard to get fresh air to CAI and suffers from major heat soak issues.
5. Firewall is right next to the turbo forcing larger turbo installations to be tough.
6. Few mod companies have fully overcome the fueling tuning of this APH motor cause of its smaller injectors which no other 1.8t motor have.

ECM relay is controled via pin 21 on ECU. And it suply power to 121 PIN, what is power for throttle body and VVT

Strange that you have Camshaft DTC, check do you have 4 window camshaft rotor, and is your engine have proper timing