HI,I have a 1995 Honda civic LX, How can i tell if the speed sensor went bad in

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C5 Corvette owner

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my car, or if its my speedo.? The cars speedometer stoped working the other day, and every one says its the speed sensor..well how can i tell. with out spending all kinds of money to find out.And no check engine light is on..the odemeter don't even work now.to tell me how many miles i have driven..I need it fixed..can any one give some good advice?..Thanks
 
If neither the speedometer nor the odometer work it is definitely a problem with either the vehicle speed sensor or the connector for the vehicle speed sensor.

the odometer and speedometer have separate drive circuits but the common input from the vss. If it were a gauge problem then one or the other would not work but not both. if it were a printed circuit boad problem none of none of the gauges would work and if it were a fuse then none of the gauges would work. That leaves either the vehicle speed sensor or the connetor as the signal from the sensor is not getting to the gauges.


here's how the circuit works per the service manual

When the ignition switch is in ON or START,
battery voltage is supplied through fuse 15 to the
gauges in the gauge assembly.

Speedometer and Odometer
The odometer and speedometer drive circuits
receive pulses from the vehicle speed sensor
(VSS). The pulse rate increases as the car
accelerates. The frequency and duration of these
input pulses are measured and displayed by the
speedometer, odometer and tripmeter

the vehicle speed sensor is located on the top of the transmission and is held in by two bolts. it is very easy to change out--just unplug the connector, remove the two bolts and lift it out. there is no calibration necessary as the replacement just drops in and bolts down.

hope that helps
 
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