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fault in speedo

my 1994 chevy half ton two wheel drive with a 350 4 speed automatic trans has a broken odometer . heres the symptoms help me find the problem . all of a sudden my speed gauge starts to read 60 km when its in gear and stopped plus the odometer keeps adding km eventhough the truck is not moving even when its in neutral. when im movingbthe speed gauge has the needle pined to the max and the km piling up " wouldnt be so bad if they were coming off but there going on" and the cruise control cant seem to find the right speed i guess its getting conflicting information but the tach works perfect and so do the other gauges

Reply to
tk_b
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this will sound crazy, but take off the alternator drive belt and try it

a bad diode in the alternator will generate enough electrical noise to fool the ECM into thinking it's seeing speed sensor data

Reply to
TranSurgeon

Hey G,

Other than the above possibility, have you ever seen a VSS or VSS buffer crap out and cause the above symptoms?

Doc

Reply to
"Doc"

nope

they usually work, or not, or the wires rot off right where it goes into the connector

Reply to
TranSurgeon

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