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Author Topic: CAN-bus configuration and eliminating CAN related errors  (Read 34451 times)
nyet
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« Reply #30 on: February 19, 2013, 06:06:01 PM »

set 0x12C7A=32 to 0 (mbox), CLACINS leave stock...
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ddillenger
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« Reply #31 on: February 19, 2013, 06:15:08 PM »

can do. I'll flash it tonight.
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jibberjive
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« Reply #32 on: February 20, 2013, 05:55:24 AM »

So if one had a C5 A6 that they swapped from auto to manual and tossed out the TCU, they would need to find the right cw_can_x_a (x being the number) and change the coding to a variant that is manual (and consequently ignores the TCU input but leaves the ABS and cluster on via CAN), in order to properly fix the CAN communication error for the missing TCU, is this correct?
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prj
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« Reply #33 on: February 20, 2013, 07:54:22 AM »

So if one had a C5 A6 that they swapped from auto to manual and tossed out the TCU, they would need to find the right cw_can_x_a (x being the number) and change the coding to a variant that is manual (and consequently ignores the TCU input but leaves the ABS and cluster on via CAN), in order to properly fix the CAN communication error for the missing TCU, is this correct?

If there is a coding variant stored in the ECU.
In case of the RS6, there is no coding variant for manual. You can code it to manual, but that will accomplish nothing.
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jibberjive
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« Reply #34 on: February 20, 2013, 09:12:06 AM »

Do you by chance know if the 4.2 A6 has the manual coding variant stored in the ECU?
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prj
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« Reply #35 on: February 20, 2013, 09:14:04 AM »

Do you by chance know if the 4.2 A6 has the manual coding variant stored in the ECU?

Pretty sure it doesn't.
There was only S6 and S8 with the manual, but they have a lot of other changes too, like injectors, MAF and so on.
Nonetheless, probably easier to start with one of those files and then re-calibrate the MAF/injectors than try to do the manual conversion (what a pain in the arse it is...).
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« Reply #36 on: February 20, 2013, 11:47:35 AM »

True. Thanks.
« Last Edit: February 21, 2013, 07:33:45 PM by jibberjive » Logged
ddillenger
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« Reply #37 on: February 21, 2013, 07:42:34 PM »

Jibberjive:

I have a flash for an me7.1.1 s6 with manual trans setup for a6 injectors and maf if you'd like it. Problem is the intake map is still for an s6 with only one state change as opposed to two for the a6. As the s6 only uses one solenoid to activate the changeover pods I don't quite know what to do about this. It runs ok, but isn't as strong as it should be. There is a noticable dip up top. I'd think you could connect both vacuum pods to the same solenoid, but still with the a6 gearing it would leave something to be desired.
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ddillenger
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« Reply #38 on: February 05, 2014, 03:46:01 AM »

The changes that were in the wiki were insufficient for variant coding. To ensure this code (P1650) is removed for both coding variations you must set CW_CAN_R_0_A (06611) and CW_CAN_R_1_A (06711).

For the M-box:

12C7A 32--->0
12C7C 36--->4 (Don't just 0 this or you remove ABS/ESP module reception from the ecu)

For the L-box you can't 0 these or you'll kill CAN reception/timeout monitoring for the TCU as well. Instead:

12C7A 35--->3
12C7C 37--->7

This will ensure CAN monitoring is still active for the TCU and ABS, but kill P1650 when running L-box software in the earlier Bosch equipped cars.
« Last Edit: February 05, 2014, 03:50:49 AM by ddillenger » Logged

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nyet
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« Reply #39 on: February 05, 2014, 05:59:15 PM »

Thanks for editing the wiki for me Smiley
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ME7.1 tuning guide
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Please do not ask me for tunes. I'm here to help people make their own.

Do not PM me technical questions! Please, ask all questions on the forums! Doing so will ensure the next person with the same issue gets the opportunity to learn from your ex
ddillenger
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« Reply #40 on: February 05, 2014, 06:04:53 PM »

Thanks for editing the wiki for me Smiley

'Tis the nature of a wiki sir.

But seriously, I do it for the kids.
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jibberjive
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« Reply #41 on: February 05, 2014, 10:55:16 PM »

But seriously, I do it for the kids.
Wu Tang is for the children!

http://youtu.be/BS181X4F3bw
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mightemouce
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« Reply #42 on: December 06, 2014, 09:05:48 AM »

Bumping an older thread.. But I believe this is exactly what I need to edit on to get rid of the last light on my swap.

Can anyone confirm these values on an A Box Ecu ?
cw_can_s_0_a     0x12C80       default value: 255
cw_can_s_1_a     0x12C82       default value: 255
cw_can_r_0_a     0x12C7A       default value:   32
cw_can_r_1_a     0x12C7C       default value:   36
cw_can_r_2_a     0x12C7E       default value:  100
cw_can_c         0x10191       default value:   69

or what the offset between the a box and mbox locations of these values would be?
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Jannik07
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« Reply #43 on: October 03, 2023, 10:19:53 AM »

For those who are looking for answers like me Cheesy

I also had problems with a RS6 C5 manual conversion. To get rid of the codes i modifief CW_CAN_R (first too bytes to 0) and CWGC from 1 to 15. 15 is the value for manual transmission. Of course there are other mods to do, but thats a good startingpoint. In my case the car had an ESP Unit from a S6.

Cheers !
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prj
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« Reply #44 on: October 03, 2023, 02:17:18 PM »

This is the smallest one of all the problems.

By far the biggest problem is the idle PID, LSD, ARMD etc being calibrated for the torque converter, and not for a clutch pedal.
Even installing the pedal you get random rev hangs, stalling and bunnyhopping on the car.

This is what takes the longest to get right. And there's not even a "magic bullet" solution because everybody fits a different weight flywheel on the thing.
So end calibration always has to be done regardless.
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