My FSM says its a pressure regulator control module. now i am curious.... ....
Post Merge: 04:17:37 AM / 21-Feb-11
ok wiring shows that it has 6 wires.
Yellow/Green: connects to water temp sensor, (other side of the wire) EFI
Purple: connects to Pressure regulator control solenoid valve
Orange: Vacuum switch
Black: Ground, shares a ground with water temp sensor
Black/Red: connects to Pressure regulator control solenoid valve,Air regulator. (other side of the wire) fuse block (10amp second from the bottom, on left side), EFI Main relay
Black/Yellow: connects to EFI, Ignition Switch, Starter motor