Question about 1998 Plymouth Neon

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My speedometer on my 98 Neon is not working properly. It appears to be working when I first get in my car but after driving for a couple miles it begins "jumping" then just stops working all together. Once I park for a while then go to leave again it starts all over.

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This problem is related to few possibilities.
All has to be checked one by one.
1) The speed sensor.if the sensor is weak it may cause this problem in speedometer.Get the speed sensor checked.
2) The internal dash wires from speedometer to main wiring harness.If any of the wire is getting short then this will cause the speedometer to shutdown or function randomly due to overheat.but when you shut the engine off then on this recirculates the circuit and this same cycle repeats after few minutes when it again gets overheated due to short in wires.
So the wires needs to be checked with multimeter and continuity tester to confirm short.
3) The other faulty part to be checked is signal generator.
A weak signal generator for the speedometer. Replacing it should fix your problem.
4) The other possibility can be internal motor gears of speedometer internally.It has to be checked after confirming all the above possibilities are functioning.
The Vehicle Speed Sensor (VSS) is a pulse generator mounted to an adapter near the transmission output shaft. The sensor is driven through the adapter by a speedometer pinion gear. The VSS pulse signal to the speedometer/odometer is monitored by the PCM speed control circuitry to determine vehicle speed and to maintain speed control set speed.

NOTE: When the sensor is removed for any reason, a NEW 0-ring must be installed on its outside diameter.
NOTE: The vehicle speed sensor is located in the transmission extension housing .
Disconnect electrical connector from sensor.
Remove the sensor mounting bolt.
Lift the sensor out of the trans-axle extension housing. Ensure the 0-ring was removed with the sensor.
NOTE: The speed sensor gear meshes with a gear on the output shaft.
With 0-ring in place, install sensor and seat sensor by hand -- to ensure proper gear engagement.
Install mounting bolt and torque bolt to 2.2 Nm (20 in lb) .
Connect electrical connector to sensor.

for more details check fig:--
Thanks. Keep updated for any more query. You can rate this solution and show your appreciation.

My speedometer on my 98 - d6f3ebc.gif


Posted on Jul 15, 2010


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