Pcm Code P075 - VSS Signal Interrupt: 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 compares vehicle speed to manifold pressure. Change in MAP must correspond with a change in vehicle speed. PCM will ignore test if conditions for engine idle are present. If vehicle speed changes 8 MPH or greater in one second and is not accompanied by a greater than 2 kPa change in MAP, Code P075 will set.