Pcm Code P034 - Map Sensor Signal Too High: Notes
WARNING: This page is about a different car, the 1993 Cadillac Seville and 1993 Cadillac Eldorado. However, it is still accessible from the selected car via links, so may be relevant.
This test monitors MAP sensor signals for loss of engine vacuum under closed throttle condition. If difference between MAP signal and calculated BARO is 11 kPa or less for 15 seconds, Code P034 sets.