PI83: Cruise Control SET/COAST Switch
WARNING: This page is about a different car, the 1995 Cadillac Eldorado. However, it is still accessible from the selected car via links, so may be relevant.
Test detects closing of SET/COAST switch at PCM terminal No. 2D15. See Figure . PI83 should be LO with cruise control switch off and HI with cruise control switch on.