97 olds bravada,59k miles. stop shifting and i have codes p0140, 0141, 0740, 0753, 0758, 0785, p1860. i have alldata diy and ive been using this diagnostic chart--

http://www.alldatadiy.com/alldata/AF...3249/172763250

i cant seem to get the image on here but that link should work, i hope. anyways , my trans fuse is not blown so ive been trying to locate the engine to transmission 20-way connecter but cant find it. alldata has been no help to me for locating it either. do i reach it from under the car or in the engine compartment? an image would b great

also, since i have the o2 sensor codes, im guessing i have a bad connectionin that connector or somewhere near it. any advice appreciated