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A speed sensor that has failed may stop the speedometer from working. You may also notice that your vehicle is not running smoothly and you are not able to use the vehicle's cruise control. ... When the fuse for your speedometer stops working, it can cause the speedometer to drop to zero.
all best yes it a sensor
If the speedometer and odometer are not working the problem is usually lack of signal from the transmission speed sensor. But if the cruise control works and the speedometer does not, my guess would be a problem inside the cluster.
cruise control operation is reliant on the following
road speed sensor ( speedo or VSS sensor )
engine rpms tacho/ ignition coil/module problem
clutch pedal sensor (VSS in automatic )
gear selection position sensor ( not properly adjusted causing flickering of the selector light)
brake pedal sensor
bad ground wire connections
r all need to work together or the CC will stop working
nothing to do with vents and all that you mentioned.
wire connections and harness connections for the transmission are suspect
CC will not operate under certain engine rpms and road speed
the speedo is run by a nylon gear on the ebd of the vehcile speed sensor mounted on the trans. Sometimes it won't come out due to corrosion.
A siganl then goes to the instrument cluster and is converted to operate the speedo and also tells the engine computer speed info to control shift quality, etc.
I would first check the 2 wire connector on the top back of the trans where the VSS is mounted. Sometimes it gets corroded too.
It is either the speed sensor, the wireing in between ot the speedometer module it self. The sensor sends pulse train signal to the speedometer module and there it drives the speedometer and is divided in frequency by about 7 and feed to the computer and the cruise control. When the signal drops the Engine management computer thinks the speed is real slow and raises the transmission pressure.
In the one I had it was a cold solder jooint on the bacjk of the speedometer module itself but this was the divided output and the speedometer itself still worked. The easyest part would be the sensor that mounts on the rear axile I believe and should cost less than 30.00 dollars. If not that thebn it's the wiring or the speedometer module electronics..
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