Neue Motorcomputer umcodieren: ohne Probs möglich? | Posts 16+

Hello again,

Today, I tried to re-code my engine control unit according to Theresia's list, specifically changing the setting for "air conditioning" to 00002.
I hoped that, at best, this would result in a few extra horsepower, which would be offset by the actual environmental impact of the process.

He also accepted the offer of 00002.
Upon starting the engine, I noticed that the control LEDs for the PTC heater illuminated, even though I had set the heating to "cold" (normally, the electric heater only activates during a cold start and not when the engine is already warm).
The error log also showed something like "no communication with climate control module."

Fazit:
Conclusion:

1. That probably didn't work out.

2. Without the control LEDs for the heating system, I would have been driving around with those unnecessary power consumers for who knows how long, until I might have noticed the unusual relay clicking, which would have indicated that something was different from usual -> Trying is good, but checking is better .

At least, the subsequent re-encoding to 00005 was successful .

Bad, or rather, strange – that's the only list available for the ASZ (presumably a specific organization or institution), at least the only one I've come across.

Theresias wrote:

Schlecht oder besser gesagt komisch, das ist die einzige Liste die es für den ASZ gibt, zumindest die einzige die mir über den Weg gelaufen ist.

I don't find that really funny; I actually think it's understandable.

In the era of Controller Area Networks (CAN), each Electronic Control Unit (ECU) will have an error entry if another ECU is not communicating with it as expected.

And regarding the electric heater – who knows what function the STG (Steuergerät) outputs, to which the heater is connected when there's no air conditioning system, have in a Polo *with* air conditioning...?

Motto:
Make everything so complicated and convoluted that every small change (out of curiosity) creates at least 3 new problems that you absolutely didn't anticipate .

Um, hold on a second! I assumed you had air conditioning...

But if I read it again now...

Then you don't have any climate control...?

If that is the case, then the list is correct and everything is fine .

Theresias wrote:

If that is the case, then the list is correct and everything is fine

.
Yes, your list is okay .

I was just thinking that maybe we could squeeze out a few more horsepower by tweaking the engine's climate control coding...

ulf wrote:

Und zur Elektroheizung - wer weiß, welche Funktion die STG-Ausgänge, an denen ohne Klima die Heizung hängt, bei einem Polo mit Klima haben . . . ??

Speculation mode activated:
Deactivation of the air conditioning system by the main control unit (MSG) via the "air conditioning deactivation relay" in the fuse box, if necessary (e.g., due to overheating of the water circuit, low speed, etc.).
/speculation mode on

Regards,
Sure.

Here is the translation of the text from German to English:

"Guste" means "gust" in English. It refers to a sudden and strong gust of wind.

SPECULATION MODE: SUCCESSFUL!!!

If the engine speed drops too low during acceleration with the air conditioning on, because not enough gas is given and the engine control unit cannot correct this quickly enough, the air conditioning will be abruptly switched off to prevent the engine from stalling. This feature isn't stupid, because otherwise you might stall the car in the middle of an intersection, potentially causing an accident.ERKLÄRMODUS BEENDET !!!

But we've already talked about how our TDI engines seem to lose no power when the air conditioning is turned on. Wasn't there an idea that a slightly higher performance curve might be used with the A/C on to compensate for the power consumption of the air conditioning system?
Don't pin me down to specific values, but I can turn the air conditioning on and off in my Golf and don't notice any significant loss of performance.
That could also be imagination.

matthiasTDI96 wrote:

Gab es da nicht mal eine Idee das evtl ein etwas erhöhtes Kennfeld bei eingeschalteter Klima benutzt wird um den Leistungsbebarf der Klima zu kompensieren.

Hello Mathias,

When the air conditioning is turned on, the engine control unit (ECU) releases an additional amount of fuel injection, correct? However, I heard that this doesn't happen based on a lookup table (map), but rather as a fixed value.

However, this increase in quantity is achieved through an input to the engine control unit (ECU). The additional possibility of deactivating the air conditioning system by the ECU occurs via an output.

The pin for Ulf's auxiliary heater is definitely an output, which is why I suspect it's related to the climate control shut-off or enable function. To be sure, you would need to examine the SLPs (Service Programming) of a system with climate control and compare that pin with the signal used to control Ulf's auxiliary heater.

Des weiteren wird Ulf's MSG den Klima-Eingang wahrscheinlich nutzen um von dem Heizungtemperaturdreher den maximal Anschlag gemeldet zu bekommen. Hierzu könnte Ulf mal sein MSG auf "mit Klima" codieren und fahren (ja, ich weiß, dann läuft diese Zusatzheizung die ganze Zeit...). Ich vermute wenn Ulf dann den Heizungtemperaturdreher auf den heißen Anschlag dreht, wird auf mal mehr eingespritzt, da daß MSG glaubt, die Klima wäre eingeschaltet worden. {MAAlmost: the more heating, the faster .

@Ulf:
Would you like to test that?

I find it interesting that vehicles with air conditioning don't have this kind of hot air heating system. It's typical VW: either you live in a warm country or a cold one... There's no country where it can be both warm and cold.

Regards,
Sure.

Here is the translation of the text from German to English:

"Guste" means "gust" in English. It refers to a sudden and strong gust of wind.

guste100 wrote:

One would have to examine the SLP settings of a unit with climate control and compare the pin with Ulf's additional heating control to know for sure. Bitte gib mir den deutschen Text, den du übersetzt haben möchtest. Here's a possible translation: Ulf could try setting his MSG to "with climate control" mode and driving (yes, I know that would mean the auxiliary heater runs constantly...). I suspect that if Ulf then turns the heating temperature dial all the way up, more fuel might be injected because the MSG thinks the air conditioning has been turned on. In other words: the more heat, the faster. @Ulf: Magst du das mal testen?

Basically, yes... and I could disable the heating system by pulling the relays.

But a look at the climate SLP (Sea Level Pressure) for the 9N region has once again brought my confidence level down to around zero.
It doesn't seem like there are any "exclusive" connections between the climate control and engine control units; instead, everything probably runs through the CAN bus.

To trick the engine computer into activating the air conditioning, I believe you would need a processor that simulates the CAN interface of the climate control system.

Um also dem Motorcomputer das Einschalten der Klima vorzugaukeln, bräuchte man IMO einen Prozessor, der das CAN-Interface einer Klima simuliert . . .???

You are correct because what you ultimately program into the engine control unit is simply whether or not the control unit should wait for CAN messages from the climate control system. The fact that this has the aforementioned side effects is a different matter.

@guste100

Why shouldn't vehicles with air conditioning also have heaters?

Best regards, WarLord.

WarLord wrote:

@guste100: Warum sollen die Fahrzeuge mit Klima diese Heizungen nicht haben?

So far, my understanding is that if Ulf changes the setting of his car (which has heating but no air conditioning) from "heating only" to "with air conditioning," then his heating system will no longer function correctly. Therefore, it appears that at least with Ulf's car's control module (MSG), it is not possible to activate both air conditioning and heating simultaneously.

Regards,
Sure.

Here is the translation of the text from German to English:

"Guste" means "gust" in English. It refers to a sudden and strong gust of wind.