NefMoto > Technical > Diagnostics > Relationship between ECU and TCU
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Author Topic: Relationship between ECU and TCU  (Read 6462 times)
gruppe5
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« on: February 08, 2017, 08:31:07 PM »
Can anyone explain it? I ask because I get a "incompatible" message on a 4.2 swapped C5 A6 ( originally a 3.0 ) How does the ECU know which TCU is connected and furthermore can that be programmed out??
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k0mpresd
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« Reply #1 on: February 09, 2017, 02:45:09 AM »
3.0 = 5hp19, 4.2 = 5hp24, is why you receive that message.

if you used the original 3.0 gearbox/tcu, this can be fixed in the 4.2 ecu software very easily.
if you used the original 4.2 gearbox, then you should be using 4.2 tcu as well.
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gruppe5
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« Reply #2 on: February 09, 2017, 01:04:20 PM »
Quote from: k0mpresd on February 09, 2017, 02:45:09 AM
3.0 = 5hp19, 4.2 = 5hp24, is why you receive that message.

if you used the original 3.0 gearbox/tcu, this can be fixed in the 4.2 ecu software very easily.
if you used the original 4.2 gearbox, then you should be using 4.2 tcu as well.

I used the original 3.0 transmission ( 5HP19 ) and ECU. I could not find the solution anywhere I looked, right now I am trying a different TCU from a 2.7t but if you have a solution it would be great.  The error message was 18249 - Engine Control Module / Transmission Control Module Incompatible
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k0mpresd
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« Reply #3 on: February 10, 2017, 06:11:15 AM »
i know solution. tcu swap is not it, 2.7t = 5hp19 as well.
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gruppe5
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« Reply #4 on: February 10, 2017, 07:28:34 AM »
Quote from: k0mpresd on February 10, 2017, 06:11:15 AM
i know solution. tcu swap is not it, 2.7t = 5hp19 as well.

I figured it was worth a shot (ECU swap) but that did not work.  Right now I cant move the car unless I push it, what can I do?
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nubcake
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« Reply #5 on: March 13, 2017, 02:40:56 PM »
CANVERS, FMOTC, CWGC in the ECU.
Set those to proper values to match those in TCU.
(Better late than never, huh?) Cheesy

PS:
PM if you can't figure it out yourself.
« Last Edit: March 13, 2017, 02:42:44 PM by nubcake » Logged
10101011
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« Reply #6 on: March 23, 2017, 11:34:28 AM »
Quote from: gruppe5 on February 10, 2017, 07:28:34 AM
I figured it was worth a shot (ECU swap) but that did not work.  Right now I cant move the car unless I push it, what can I do?


Have you tried to contact NYET on this forum ??  How did that cylinder head I sold you work out  the 2.0T ?  Grin
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Poor quality lingers long after the price is forgotten ....
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