99 Sportage 4x4 auto not shifting

I am at a loss. You can shift from low, 2, and drive manually, but it seems like when you put it in drive it stays in 3rd or 4th. I have checked wires for connection, and tried messing with the hold button, but nothing. Hoping someone has some insight or vaccum/electrical diagrams so I can cover my bases. Thanks.

verify electrical diagrams and others at www.kiatechinfo.com
here are some:
www.avigex.ca/kia/autotrans1.gif
www.avigex.ca/kia/autotrans2.gif