help! speedo not working

[butta]

:down: I have got a 1998 micra si and it has a electric speedo drive/sensor that fits in the top of the gearbox this sensor has failed four times in twelve months (no external damage just to the electrics inside). i have checked the gearbox oil level and type and the earth straps to the gearbox but it still fails every few months. am new to the msc so any help/advice is greatly recived

 

[NeX]

have you replaced the entire unit?

are you sure its the unit on the gearbox?

is there any rust etc on the wires/plugs?

can the unit move freely?

i don't know much about the electronic speedos but it seems to me like there is a voltage leak or something that is slowly damaging the sensor,

you will probably find it is the loom between the sensor and guage cluster. if you have a multimeter then check it out

good luck mate

 

[Swiper]

this happen to me, twice in two weeks. i changed the gear box oil as it looked a bit creamy on mine. this seems to have sorted the problem for now.
one of the speedeo drives, the cog melted off the end. the other started to melt off.

 

[butta]

thanks for the feedback so far

have checked the loom between speed sensor and clock and the circut is fine. and i did change the whole sensor unit each time. i am starting to think the speedo might be the fault. can anybody think of anything else cuz im confused?