PTCU programming and coding after service
Thread Starter
Junior Member
Joined: Jun 2021
Posts: 28
Likes: 26
From: Switzerland
AMG GT R
PTCU programming and coding after service
Hi.
I got my car back from servicing however there is one item marked as "control unit PTCU programming and coding".
My engine is also modified with highflowed turbos, thus was also tuned.
Question:
* does this mean I have lost my tune, suited to the turbos? Or any other consequence, considering I do not know what "PTCU" entails.
I got my car back from servicing however there is one item marked as "control unit PTCU programming and coding".
My engine is also modified with highflowed turbos, thus was also tuned.
Question:
* does this mean I have lost my tune, suited to the turbos? Or any other consequence, considering I do not know what "PTCU" entails.
MBWorld God!
Joined: Dec 2019
Posts: 31,846
Likes: 6,198
Hi.
I got my car back from servicing however there is one item marked as "control unit PTCU programming and coding".
My engine is also modified with highflowed turbos, thus was also tuned.
Question:
* does this mean I have lost my tune, suited to the turbos? Or any other consequence, considering I do not know what "PTCU" entails.
I got my car back from servicing however there is one item marked as "control unit PTCU programming and coding".
My engine is also modified with highflowed turbos, thus was also tuned.
Question:
* does this mean I have lost my tune, suited to the turbos? Or any other consequence, considering I do not know what "PTCU" entails.
MBWorld God!
Joined: Dec 2019
Posts: 31,846
Likes: 6,198
not sure if your car is affected by the glitching service interval reminder thing, but the C 63 S folks had that it there was a recall that installs an update to the PTCU.https://mbworld.org/forums/c63-c63s-...1p5498710.html
Thread Starter
Junior Member
Joined: Jun 2021
Posts: 28
Likes: 26
From: Switzerland
AMG GT R
Thanks for the reply.
Probably something similar, because the last 2 previous years of servicing, they did not make this "mistake", even though I went to this same mercedes workshop that also sold me the car. Since it was school holidays, the senior guys were not there, so probably did not advise to NOT do this (if I am guessing).
For me, the workshop item code is "00540991".
So. the end result (and observation of) after another drive is:
Probably something similar, because the last 2 previous years of servicing, they did not make this "mistake", even though I went to this same mercedes workshop that also sold me the car. Since it was school holidays, the senior guys were not there, so probably did not advise to NOT do this (if I am guessing).
For me, the workshop item code is "00540991".
So. the end result (and observation of) after another drive is:
- check engine light is now ON, most likely triggered by exceeding fuel trim limits. (running too lean?)
- engine shows boost under cruising(??), so either the calibration information is corrupted, or is the result of highflow turbos + OEM tune.
- engine shows 50% boost under some load at 2000-2500 RPM, but not much power (doesn't accelerate as good as before). It was never like this before, even when I tried to push the car before this event.
- This behaviour reminds me of my old days with japanese turbo engines, with stock turbos, aftermarket intercooler and freeflowing downpipes, and running either auto/manual OEM ECU. Made boost a bit too quickly, but RPMs did not accelerate with increase in boost.
- wait 2 weeks (23 October) until my original tuner (that also did the modifications) is back from holidays.
- enjoy the car 1 week more (Oct 25+1week) before parking it for winter.
MBWorld God!
Joined: Dec 2019
Posts: 31,846
Likes: 6,198
Thanks for the reply.
Probably something similar, because the last 2 previous years of servicing, they did not make this "mistake", even though I went to this same mercedes workshop that also sold me the car. Since it was school holidays, the senior guys were not there, so probably did not advise to NOT do this (if I am guessing).
For me, the workshop item code is "00540991".
So. the end result (and observation of) after another drive is:
Probably something similar, because the last 2 previous years of servicing, they did not make this "mistake", even though I went to this same mercedes workshop that also sold me the car. Since it was school holidays, the senior guys were not there, so probably did not advise to NOT do this (if I am guessing).
For me, the workshop item code is "00540991".
So. the end result (and observation of) after another drive is:
- check engine light is now ON, most likely triggered by exceeding fuel trim limits. (running too lean?)
- engine shows boost under cruising(??), so either the calibration information is corrupted, or is the result of highflow turbos + OEM tune.
- engine shows 50% boost under some load at 2000-2500 RPM, but not much power (doesn't accelerate as good as before). It was never like this before, even when I tried to push the car before this event.
- This behaviour reminds me of my old days with japanese turbo engines, with stock turbos, aftermarket intercooler and freeflowing downpipes, and running either auto/manual OEM ECU. Made boost a bit too quickly, but RPMs did not accelerate with increase in boost.
- wait 2 weeks (23 October) until my original tuner (that also did the modifications) is back from holidays.
- enjoy the car 1 week more (Oct 25+1week) before parking it for winter.
Thread Starter
Junior Member
Joined: Jun 2021
Posts: 28
Likes: 26
From: Switzerland
AMG GT R
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Thread Starter
Junior Member
Joined: Jun 2021
Posts: 28
Likes: 26
From: Switzerland
AMG GT R
I dont think these guys are clueful as they just would follow XENTRY software, and just click "OK" when they see "THIS WILL FIX ALL YOUR PROBLEMS" or something like that.
OBD reader provided me the following:
ECM/ECU: Codes: P042000,P043000 (fuel trim related, just as I expected)
ECM/ECU: Software 13.36.00 (unsure what it was previously, but my tuner will find out on monday, if it creates a different problem)
PTCU: Software 12.48.05
Relevant to AMG GT R MY2020.
I can feel the PTCU does not feel lethargic like before... so most likely it too was overwritten.
But the ECM I feel was overwritten, I will re-check it again tomorrow.
We'll see on Monday.... or by tuesday/wednesday once it gets "fixed" by the tuner.
Long term, I would like to reverse engineer this tune, and document it for other people's benefit. That's a long term aim... Stay tuned :-)
OBD reader provided me the following:
ECM/ECU: Codes: P042000,P043000 (fuel trim related, just as I expected)
ECM/ECU: Software 13.36.00 (unsure what it was previously, but my tuner will find out on monday, if it creates a different problem)
PTCU: Software 12.48.05
Relevant to AMG GT R MY2020.
I can feel the PTCU does not feel lethargic like before... so most likely it too was overwritten.
But the ECM I feel was overwritten, I will re-check it again tomorrow.
We'll see on Monday.... or by tuesday/wednesday once it gets "fixed" by the tuner.
Long term, I would like to reverse engineer this tune, and document it for other people's benefit. That's a long term aim... Stay tuned :-)
Thread Starter
Junior Member
Joined: Jun 2021
Posts: 28
Likes: 26
From: Switzerland
AMG GT R
Finally got my car back today with ECU/TCU re-tuned.
Weirdly enough, the car/engine was dyno'd at ~850ps peak, instead of ~750ps... They were surprised, but then did not admit how/why.
TCU was also updated to support the extra power/torque.
As for reverse engineering the tune... It would be nice to do... but any option is just a little bit too much effort or money involved, and risk, too.
Long term, I think it is best to ensure the OBD port cannot be physically connected to, to avoid losing the ECU/TCU tune.
Weirdly enough, the car/engine was dyno'd at ~850ps peak, instead of ~750ps... They were surprised, but then did not admit how/why.
TCU was also updated to support the extra power/torque.
As for reverse engineering the tune... It would be nice to do... but any option is just a little bit too much effort or money involved, and risk, too.
Long term, I think it is best to ensure the OBD port cannot be physically connected to, to avoid losing the ECU/TCU tune.
