Basically it means the computer is talking to the sensors and found no fault. Like a handshake, how are ya?
Means there are no stored codes to show.
86 Trooper (sold to brother) wrecked and recycled
88 Trooper (recycled)
91 Trooper, 3.1, bored .40, Cam, 4.3 TBI, roller rockers, Fiero valve covers, remote oil filter, LSD, 2.25 Cat back exhaust, BJ flip, 5 speed conversion, Round eye conversion-retired and parts donated to the new 91
91 LS Trooper, 5 speed, 3.4, bored intake, LSD, rebuilt using parts donated from the first 91viewtopic.php?f=15&t=81567
89 Pup LS Space Cab, 4X4, AMC head, Delta 260 cam, 2.25 cat back exhaust system, LSD viewtopic.php?t=55081