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SAI error codes on a 986 Tiptronic


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Hi all,

2000 Boxster Tiptronic with 113k mi.  I recently removed the transmission to deal with another issue, but while doing so some of the brittle SAI hoses cracked and/or became disassembled.  I have replaced the cracked lines (i.e. not all of the lines) and reconnected according to the following picture, with the exception that I have a Tiptronic and there is a hose that runs to a changeover valve on the transmission:

image.thumb.png.8d55cfc298675a019869bfbb605cb9f1.png

I get the typical SAI codes, P0410 (80) and P1411 (208), about every 150mi driven.  Otherwise the car drives great...SAI pump is running and holding air as usual.

 

Presumably, I have something connected incorrectly, possibly with respect to connection to the transmission changeover valve.  The one thing I notice different than before removing the transmission is that the car seems to be running cooler than before.  I suspect this could be caused by the changeover valve for the transmission as I think it controls the flow of coolant to the ATF cooler (not sure about this and hoping for clarification).  The other thing that I don't really suspect, is that the new hoses used do not have the small bulbed end to help with that snap-fit into the intake sleeves. 

 

I have not found a good image showing the SAI hose routing for a 986 Tiptronic, so if anyone knows of one I would be very grateful.  I have the Bentley manual which also does not show a Tiptronic-specific diagram for SAI routing.

 

Any other ideas or does this sound like simply incorrect hose connections?

 

Many thanks for your input!

 

 

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  • 1 month later...

I finally figured this out in case it helps anyone. The broken line was hiding from me. It is not very visible because it was the one right beside / behind the vacuum reservoir that goes to the switch right there. The switch is also not visible but since I knew that I had confirmed every other line I knew there was one hiding in there somewhere. The diagrams are misleading as to the distance between the components of the SAI system. This particular switch and line are most easily accessed by removing the intake plenum on the right side of the car. However I was able to get in there with some long and small surgical instruments to grip the elbow hose, pull out the end of the broken line, and feed in a new line which I routed in a more obvious way if it ever breaks again.

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