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Rusty,
When this transaxle went out, all the fluid had leaked out of the differential portion of the transaxle and it just ground to a halt. Could that in and of itself caused some of the fuses in the TCU to blow?
Originally Posted by Rusty Spokes
(Post 25049361)
I would go look behind the passenger side "kick-panel" Pull the carpet back and you will find some fuses along with the TCU and ECU. Those fuses control the fuel pump and provide voltage to the multi-function switch for the transmission.
Remove and replace all the fuses. Here is a picture (similar on all A6-C4 cars)..those fuses get corroded..it is worth a shot to try it. https://cimg5.ibsrv.net/gimg/www.aud...f21b82b26c.jpg |
Rusty,
Could the TCU (Transmission Control Unit) somehow got stuck in its reaction to the transmission going out originally, and is still sending out the fail safe code, keeping the transmission in fail safe mode 2nd gear. A friend tells me that you can clear the system by doing a terminal 30 reset. Disconnect the battery from both terminals. Then touch the positive and negative leads together (no battery involved!) For 10 minutes. Then reconnect the battery. That is basically a master reset for all the car's systems. Should we try that?
Originally Posted by Rusty Spokes
(Post 25049361)
I would go look behind the passenger side "kick-panel" Pull the carpet back and you will find some fuses along with the TCU and ECU. Those fuses control the fuel pump and provide voltage to the multi-function switch for the transmission.
Remove and replace all the fuses. Here is a picture (similar on all A6-C4 cars)..those fuses get corroded..it is worth a shot to try it. https://cimg5.ibsrv.net/gimg/www.aud...f21b82b26c.jpg |
Could the TCU (Transmission Control Unit) somehow got stuck in its reaction to the transmission going out originally, and is still sending out the fail safe code, keeping the transmission in fail safe mode 2nd gear. A friend tells me that you can clear the system by doing a terminal 30 reset. Disconnect the battery from both terminals. Then touch the positive and negative leads together (no battery involved!) For 10 minutes. Then reconnect the battery. That is basically a master reset for all the car's systems. Should we try that?
You could do that and while you are in there..clean the ground cable where it bolts to the chassis and clean up the positive post too. In that thee shop indicated a fault code for battery voltage..look at those fuses and just replace them...they may not be "blown" but just oxidized. |
Rusty,
Just wondering, do you think the TCU could have blown out when the transmission went out. All the fluid drained out of the differential part of the transaxle, and it chewed up all the parts and ground to a halt. Could that have blown out the TCU, or would the fuses have protected it? Barry
Originally Posted by Rusty Spokes
(Post 25049629)
Could the TCU (Transmission Control Unit) somehow got stuck in its reaction to the transmission going out originally, and is still sending out the fail safe code, keeping the transmission in fail safe mode 2nd gear. A friend tells me that you can clear the system by doing a terminal 30 reset. Disconnect the battery from both terminals. Then touch the positive and negative leads together (no battery involved!) For 10 minutes. Then reconnect the battery. That is basically a master reset for all the car's systems. Should we try that?
You could do that and while you are in there..clean the ground cable where it bolts to the chassis and clean up the positive post too. In that thee shop indicated a fault code for battery voltage..look at those fuses and just replace them...they may not be "blown" but just oxidized. |
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