High RPMS while in Drive
02-27-2013, 07:08 AM
#21
AudiWorld Super User
Where do you live? Take it to an Audi dealer or a shop specializing in Audi recommended by this board. They WILL promise and warranty the fix. "Import repair shop" covers a multitude of sins and is not necessarily well versed in Audi.
02-27-2013, 07:54 AM
#22
AudiWorld Member
Thread Starter
I live in the Springfield, MO area
02-27-2013, 02:44 PM
#24
AudiWorld Member
Thread Starter
I am receiving this error codes;
P1733 – Tiptronic Switch down circ short to ground
P1739 - Tiptronic Switch up circ short to ground
P1744 - Tiptronic Switch recognition circ short to ground
I am not sure how to ask this, but what parts would I need to replace to fix these and should I fix them?
Thanks
P1733 – Tiptronic Switch down circ short to ground
P1739 - Tiptronic Switch up circ short to ground
P1744 - Tiptronic Switch recognition circ short to ground
I am not sure how to ask this, but what parts would I need to replace to fix these and should I fix them?
Thanks
02-27-2013, 05:53 PM
#25
AudiWorld Super User
none of those tiptronic codes should really cause anything. I see them on cars all the time, and the only symptom is no tiptronic action. There are magnets and circuit board under the chrome shifter plate that does all the tip stuff.
02-27-2013, 06:05 PM
#26
AudiWorld Member
Thread Starter
Thanks so much you have been a big help
Your wrong. Transmission computer uses MAF input for load calculation. Without a signal from the MAF it will go into limp mode, see it rather often. Maf codes can be caused by huge air leaks, like boost pipes blown off, broken intercooler, other air leaks.
none of those tiptronic codes should really cause anything. I see them on cars all the time, and the only symptom is no tiptronic action. There are magnets and circuit board under the chrome shifter plate that does all the tip stuff.
none of those tiptronic codes should really cause anything. I see them on cars all the time, and the only symptom is no tiptronic action. There are magnets and circuit board under the chrome shifter plate that does all the tip stuff.
02-27-2013, 08:45 PM
#27
AudiWorld Super User
[QUOTE=jcman;24413379]
The TCM communicates with the ECU on a CAN line to reduce throttle during shifts, maf input for load calculation, engine temp, and more on Drive by wire cars, ecu to tcu communication changed big time in 2000 when almost everything went full drive by wire. im Certain the picture you show is 96-99 01V trans.
Your wrong. Transmission computer uses MAF input for load calculation. Without a signal from the MAF it will go into limp mode, see it rather often. Maf codes can be caused by huge air leaks, like boost pipes blown off, broken intercooler, other air leaks.QUOTE]
There are only three signals from the ECM to the TCM and the "MAF" has no direct or CAN route, now its possible that a failed MAF could change injecter timing hence causing a "limp mode" situation as well as a cel.
ECM inputs to TCM:
1)Engine Speed Sensor G28
2)Fuel Injector (injector timing)
3)Throttle Position Sensor G69
There are only three signals from the ECM to the TCM and the "MAF" has no direct or CAN route, now its possible that a failed MAF could change injecter timing hence causing a "limp mode" situation as well as a cel.
ECM inputs to TCM:
1)Engine Speed Sensor G28
2)Fuel Injector (injector timing)
3)Throttle Position Sensor G69
Last edited by Prospeeder; 02-27-2013 at 09:02 PM.
02-28-2013, 07:55 AM
#28
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Unless the MAF is totally gone- and typically they go out of calibration, it should shift. Just differently.
I don't buy it.
I still think its either a hydraulic/valve issue or a controller issue.
I'll be very interested if the MAF is replaced an all immediately is well.
Grant
I don't buy it.
I still think its either a hydraulic/valve issue or a controller issue.
I'll be very interested if the MAF is replaced an all immediately is well.
Grant
02-28-2013, 07:45 PM
#30
AudiWorld Super User
I guess I was reading this comment that you wrote on your #25 post.
Quote:
Your wrong. Transmission computer uses MAF input for load calculation. Without a signal from the MAF it will go into limp mode, see it rather often. Maf codes can be caused by huge air leaks, like boost pipes blown off, broken intercooler, other air leaks.
So:
This means to me that you are saying in short; The TCM uses an input signal from the MAF.
Well:
That's just technically a wrong description compared to the known TCM inputs from the ECM.
Quote:
Your wrong. Transmission computer uses MAF input for load calculation. Without a signal from the MAF it will go into limp mode, see it rather often. Maf codes can be caused by huge air leaks, like boost pipes blown off, broken intercooler, other air leaks.
So:
This means to me that you are saying in short; The TCM uses an input signal from the MAF.
Well:
That's just technically a wrong description compared to the known TCM inputs from the ECM.
Last edited by Prospeeder; 02-28-2013 at 07:57 PM.