COMPLAINT:
Before or after overhaul, 1991-1995 Cadillac Deville, Concours, Eldorado and Seville, may exhibit a 3rd gear start in the Drive position along with a Diagnostic Trouble Code “PO40.”
(Power Steering Pressure Switch Circuit Open).

CAUSE:
The cause may be, the “Fuse” that supply’s the solenoids in the transmission and the Power
Steering Pressure Switch with battery voltage may have blown. NOTE: Some years have the
transmission solenoids, the EGR solenoid, Brake switch, Canister purge solenoid, Power Steering Pressure Switch and Air conditioning Relay all on the same fuse. A short or wiring problem on any and all of the above may cause the fuse to blow.You can get more car tools bmw ops head and  digiprog ecu flasher for help from http://www.cartool.info/ .

CORRECTION:
Locate the “E” terminal on the harness connector, shown in Figure 1, and check for battery voltage with the ignition on. If there is NO voltage at terminal “E”, refer to Figures 2&3 for fuse location and vehicle application and replace the fuse. NOTE: The fuse in question is highlighted for identification purposes.

Figure 1:http://flic.kr/p/dWZ6cg

Figure 2:http://flic.kr/p/dX5KDG

Figure 3:http://flic.kr/p/dWZ6fx