DK Skoda Fabia 1.4L 16V

Hi,
"Silly question, can anyone explain to me why the learning step counter in my DK (Development Kit) always stays at 12?"

Best regards,
Jörg.

I have no idea, but Autoscan is always helpful to know which vehicle it is.

Good evening.

That's relatively difficult to guess.

Did you want to recalibrate the throttle?

Is there an error in the entry? Did you remove or replace the throttle valve? Was the wiring disconnected while the vehicle battery was still connected?


What does the "Adaptation Status" field indicate?

Error?


Generally, the basic adjustment can only be performed if there are no error entries in the control unit.


If there are still any error entries, delete them and repeat the initial setup.


If the errors reappear after deleting, troubleshoot and fix them.

For some vehicles, it is helpful to clear the learned values beforehand and perform the initial adjustment on the engine while it is still warm.

If you are experiencing starting problems, it would be helpful to know your engine code.

I hope that my answer is suitable for your concisely worded question.


Otherwise, please rephrase your question and include an Autoscan.


Best regards,

Autoscan follows.

The car has a strange history.
I will add that to it.
And it has a Prins LPG system.

Jörg.

Here is the car scan.

The car received a rebuilt engine from a workshop because the original one wouldn't build oil pressure. The original engine was returned, and supposedly the same engine was installed again, along with new hydraulic lifters and an oil pump.
Reinstalled, the car runs on both gasoline and gas.
To Bosch Service, new crankshaft position sensor installed.
No change.
My car is broken down, and I need to figure out why.
Replaced the new control unit, but there's no change. The new control unit has the same values as the old one, as seen in VCDS.
The wiring harness was re-soldered due to the gas system installation.
Soldering joints look .
I'm in the process of checking them all.
I have another engine control unit (ECU) lying around. It was purchased and is supposed to be for the engine, it's an original part. BUD MKB, now likely a CGG, according to the engine code on the head.
Then, however, the WFS needs to be desoldered from the TCU (Transmission Control Unit), and the TCU that is currently installed is sometimes also difficult to access .
Axo, the company that sold the engine, no longer exists. The lawyer is involved, and the public prosecutor is likely also involved.

Jörg.

Sure, here's the translation:

"Addendum"

In the field of adaptation, Adp.I.O stands out.

New finding,

Between the DK (display), the housing, and ground, the battery voltage is present, so approximately 13V, which doesn't seem right???

Killroy0815 wrote:

New finding, between the DK (digital keypad), the enclosure, and ground, there is a battery voltage, which is approximately 13V. That doesn't seem right, does it?

Possibly a result of the modified wiring harness? The battery voltage must not be applied here.

I'm surprised that the error memory is empty.

Is it possible to understand, based on the history, in which episode certain actions took place? Then, at the very least, we would have a starting point.

Hi,


It seems like there are quite a few problems with this well-maintained, one-of-a-kind item. Since you have several tests ahead of you, I would suggest starting with the minimally invasive ones.


Since there are no error entries and the engine is running, I would first check the intake side for "vacuum leaks".

Ideally, use the exhaust gas generator; alternatively, and with CAUTION, you can use Startpilot or brake cleaner.

There is a software update available for the engine control unit (ECU) of the BUD and some other engine codes.
Check if you are affected!

Then there was a recall regarding the accelerator pedal sensors.
(Error message: poor engine performance)

Check if part 6Q1 721 503 E is installed.


Regarding the throttle valve

The value of the learning step counter is outside the tolerance range. It should ideally be between 0 and 8.

First, I would check the voltage at the throttle valve connector. Here, there should be 4.5-5.5 volts.

Then, using an oscilloscope, check the trace from the throttle potentiometer.


After that, check the small connector on the engine control unit to see if the test values specified by the manufacturer for the throttle control unit are being met.


Can you give me a general overview of where and what work was done on the wiring harness? Can a causal relationship be established between soldering work and engine operation?


I hope that helps you for now. Let's share in your progress and setbacks as you work on this piece of jewelry.


Best regards,

Hi,

I checked for air leaks right from the beginning, and everything was sealed tight.
The first engine was installed in 2019, then supposedly repaired. A second, different engine was installed, and I have photos of the engine block numbers. Afterwards, the gas system was removed or disconnected, but there was no improvement. Everything was reassembled at the end of 2019, and it has been with me since mid-2020. I initially wanted to refuse, but it's a friend, and she brought it from Bochum to Mölln with the engine – which probably wasn't easy.
I'll check the components, and I'm sure the cables were bent back and forth quite a bit, and solder joints are particularly vulnerable.
I will tackle the rest and report back.
Oh, the small connector from the control unit (STG) was, of course, also damaged by a workshop, but I've already replaced it .

Sure, no problem.

Jörg.

Does the idle control valve still work?


Does the speed change when you turn on multiple devices?

Please check the PWM signal from the idle speed control.


But are the timing chains correct? In the older models, the tensioner often wears out. !!

Is compression enabled?




Am I reading this correctly?
Is there voltage present on the throttle body housing?
How does it work? The enclosure should actually have a direct connection to the vehicle's chassis ground.

I'm excited.

Waved.

You read that right.
DK is sitting on a plastic intake manifold.
Okay, no direct connection.
Is the idle speed control valve located in the distributor?
And what about older engines? I don't know off the top of my head, is it 2007???

Jörg.

Yes, that's right, the speed control is implemented using a PWM signal.

"I don't know what they soldered together there," but if there's only voltage present now and no more PWM signal, then nothing will be controlled anymore.


Otherwise, the voltage at the housing can only be supplied through the connector at the throttle valve.

Therefore, the search radius can be narrowed down.



I'm curious...


Waved.

Hi,

The pedal has been removed, and it's a 6Q1721503F part.
There are no 12V present at the connector on the DK (Development Kit).
It's strange, but if someone has a schematic diagram, it would definitely help .

Jörg.

Hi,

Then you've already made good progress.

There shouldn't be 12 volts present there.


Dealing with circuit diagrams and copyrights is quite a thing .

Basically, Uncle Erwin (siehe Fehlerdatenbank) would be happy to see you, but I can offer a little help.

The following pins on the small connector run from the engine control unit to the...

Control unit for the DK.

At pin B 23, there should be 4-4.6 volts when the ignition is on.

At pin B3, there should be 4.9-5.1 volts when the ignition is on.

So, is the gas pedal broken?
Thank you for confirming the reservation.
I'll check that out right away.
Should the voltage be present when the ignition is turned on, and not when the engine is running?
Axo, I have a photo of the engine where there's a number, but unfortunately it doesn't say BUD or anything like that .
I'm interested.

Jörg.