vehicle -- 1998 S10 4x4 automatic trans.
I was driving along at about 50 mph when the speedo went to zero.
About 3 seconds after that, the ABS light came on. Another 3 seconds
after that, the trans. kicks down to first gear...
I made an about-face, and headed home. About 20 miles later, the SES
light came on.
when I got home, the code came back as the Vehicle Speed Sensor.
supposedly, the cascade of events is that : once the computer saw
"zero" as the speed, but the ABS wheel speed sensor saw 50 mph, it
decided that the discrepancy meant the ABS was out. *then*
computer put the truck into "limp home" mode, restricting the speed
(since it thought I had no brakes) by only giving me first gear.
I changed out the VSS, and the speedo works fine, the truck has all 4
gears back, and the brakes work fine. The SES light is out, but the
ABS light comes on as soon as I start rolling.
does the ABS have it's own, separate/independent computer ? and if
so, am I experiencing a leftover code ? can I clear it by
disconnecting the battery overnight ?
any comments appreciated...