PO700 "may" be a bad (EATX) Electrononic Automatic Transmission Controller.
PO731 is more complicated and is an intermittant problem. It is usually caused by intermittant hydraulic seal leakage in the clutch and or accumulator circuits.
After doing a little research, it seems that an input shaft speed sensor may solve the problem.
Wednesday, September 26th, 2007 AT 4:52 PM