Launch Control Flag coding

Hotter

Specialist
Jan 23, 2021
89
7
0
Hi, after flashing ZF6HP21 transmission with xHP it gets launch control feature with one downside:

There's only one "downside": You won't see the flag in the dash still, as that flag is not triggered through the transmission. Eventually it can be activated on the older cars with some coding in other modules, but technically it does no difference, wether there is a flag or not.

How to enable launch control flag in KOMBI?
Does anyone know which module needs to be coded and how?
 

pRoxxx

Lurker
Feb 9, 2021
19
2
0
I don't think it can be coded, this CC ID (The yellow flag is thrown by the gearbox), so the app in the gearbox should check that all conditions are met (TCU Temp, Engine Temp, DSC off, speed 0, etc), and then throw error CC ID. What xHP did is not truly launch control, they just lift up a TQ limiter for 1 gear. xHP doesn't change the app either.
Photo from my car when I played with this =D

temp.jpg
 
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Hotter

Specialist
Jan 23, 2021
89
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Maybe you have CAN BUS log?
I have tried to throw CC-ID code manually just to see the flag (CC-ID 446 - Launch Control?), but it does not seem to appear in KOMBI. Does KOMBI must have something special also?
Could this be that Checker Flag is only on LCI KOMBI? (did M3 had it in pre-LCI?)

CC-ID message:
Code:
592h 8 40BE0139FFFFFFFFh

I wonder does this CC-ID gets sent by xHP 6HP21 gearbox (and only KOMBI does not know how to display it)?
 
Last edited:

pRoxxx

Lurker
Feb 9, 2021
19
2
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Because your CAN-ID is wrong, 592 it's CC-ID from DME, and each ECU has its own CAN-ID for CC-ID display.
 

Hotter

Specialist
Jan 23, 2021
89
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Because your CAN-ID is wrong, 592 it's CC-ID from DME, and each ECU has its own CAN-ID for CC-ID display.
I don't think CAN-ID matters, you can send any CC-ID from any Module. Tried sending CC-ID from other Modules (592 (DME) / 598 (GKE/SMG...)/ 5A9 (DSC)) - still no flag.
Would it be possible for you to do CAN BUS log?
 

pRoxxx

Lurker
Feb 9, 2021
19
2
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When I tested it in my car it mattered, I got that flag on the dashboard only when sending it from TCU CAN-ID. I don't think that my CAN BUS log will help you, my car doesn't have a factory LC as well.
 

Hotter

Specialist
Jan 23, 2021
89
7
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When I tested it in my car it mattered, I got that flag on the dashboard only when sending it from TCU CAN-ID. I don't think that my CAN BUS log will help you, my car doesn't have a factory LC as well.
What CAN-ID do I need to use?
 

Hotter

Specialist
Jan 23, 2021
89
7
0
Could anyone who has DCT make CAN BUS log which would include Launch Control sequence?
 

Hotter

Specialist
Jan 23, 2021
89
7
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GWS seems to be 5DE but still no flag. I guess you must have different KOMBI (DKOML2) which has most probably different software and hardware:
 

pRoxxx

Lurker
Feb 9, 2021
19
2
0
GWS seems to be 5DE but still no flag. I guess you must have different KOMBI (DKOML2) which has most probably different software and hardware:
I have KOMB70, the only variant for the e70/e71 body =)
 

superwofy

Private
Jan 18, 2021
47
57
0
Code:
byte lc_cc_on[] = {0x40, 0xBE, 0x01, 0x39, 0xFF, 0xFF, 0xFF, 0xFF};
byte lc_cc_off[] = {0x40, 0xBE, 0x01, 0x30, 0xFF, 0xFF, 0xFF, 0xFF};

CAN0.sendMsgBuf(0x598, 8, lc_cc_on);        //ON

CAN0.sendMsgBuf(0x598, 8, lc_cc_off);        //OFF


Engine must be on.
 
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Hotter

Specialist
Jan 23, 2021
89
7
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Code:
byte lc_cc_on[] = {0x40, 0xBE, 0x01, 0x39, 0xFF, 0xFF, 0xFF, 0xFF};
byte lc_cc_off[] = {0x40, 0xBE, 0x01, 0x30, 0xFF, 0xFF, 0xFF, 0xFF};

CAN0.sendMsgBuf(0x598, 8, lc_cc_on);        //ON

CAN0.sendMsgBuf(0x598, 8, lc_cc_off);        //OFF


Engine must be on.
Indeed, I was able to turn on "Checker Flag" on regular KOMBI! The key thing is that engine must be ON!
I needed to simulate "Engine ON" on my bench setup:
301809662_999117454089764_5810877099188697006_n.jpg

So this CC-ID seems to be sent by DCT, sadly xHP does not modify ZF 6HP transmission code to send this CC-ID, although it enables some kind of fake launch control.
So regular KOMBI is able to show this flag, just xHP modified ZF 6HP transmission does not send it.
 
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superwofy

Private
Jan 18, 2021
47
57
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So this CC-ID seems to be sent by DCT, sadly xHP does not modify ZF 6HP transmission code to send this CC-ID, although it enables some kind of fake launch control.
So regular KOMBI is able to show this flag, just xHP modified ZF 6HP transmission does not send it.

Unless they modifly the program binary of the TCU to send that CAN message you'll never see it. And adding that would be extremely difficult, I doubt they'll do it.

You can add it with a CAN device if you wish to. I've done so in my latest commit.