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View Full Version : Tranny swap ????'s



subikid90
08-18-2010, 09:42 PM
So My LGT has a 5MT swap in it. The car runs rough and I get horrible gas mileage. I am throwing a code, P1722. From what I have found this means that the TCU is unplugged and the EDU is trying to get info from the TCU. I know that I need to ground out pin 81 on the ECU to make the ECU think it is a MT and doesn't need to gather info from the TCU.

Today I pulled back the carpet and pulled the ECU out and tried to find pin 81. I found out that pin 81 on an auto car has no wire, while the manual version has one that is grounded.

My problem is where the &(^%$*^ is pin 81!!!

If anyone has a picture or a detailed location (ex. over 5 down 1 from the left) I would be so happy. There is nothing online about where this pin 81 is located on the plug. My plug has numbers for the first 28 then I don't know where they go from there. If I keep counting starting on the next row and end up at pin 81 on the third row, there is a yellow/black wire there, which is not grounded.

If anyone in the portland area wants to come over and help me I will buy you dinner or something, no joke! I need to pass emissions because I leave for WI next week.

ouch1011
08-20-2010, 02:08 AM
There is no pin 81 there on the AT wiring harness because it would just be a wire leading to nothing. What I did was I took the diagnostic wire from the TCM, pulled the pin out of the PCM connector, reinstalled it in the pin 81 spot, and put it to ground. I believe it is a pink wire...its on the pinout tables.

subikid90
08-20-2010, 02:29 AM
Do the pins pop out of the connector pretty easy?

subikid90
08-21-2010, 02:57 AM
I got it. Everything is working awesome now. Lets hope I pass emissions now.