4310 Error code

[JRS]

I am getting the error code 1 short 2 long 1 short. The tech manual shows it to be a MFWD problem determining speed and the cruise control will be disabled. The code will only flash if it is 4 wheel drive or if I try to use the cruise control. I am going to check for loose wires and would like other suggestions before I take it to the dealer.
Thanks in advance, John