| Message |
My speedometer had been working intermittently for quite a while. I tried pulling the cluster and reflowing all the solder joints with no improvement. Then recently I was searching online for something Z –related and came across this info on “fixing” the speed sensor. I looked at mine, and sure enough the end was sticking out maybe 1/8”. Pushed it back in and now I have a speedo that doesn’t cut out again. Very happy. Speed Sensor Fix I’ll repost the words here in case the PDF disappears: “Speed Sensor Tip
I found the following article on the UK 300ZX site. All credit to JeffTT from UK. Tony (Z-FNQ) A lot of owners have issue with the speedo, power steering, auto box change etc. All of these are related in as far as they are part of the speed sensor circuit, having seen many owners pondering on if the speed sensor is at fault then take a look at the picture below. The speed sensor is rare in as far as it can be seen to be faulty by just looking at it provided of course you know what to look for. The photo actually shows autobox sensors but the manual box sensor has the same issues. The unit is a small pulse generator, as the cog is turned by the gearbox the stator is turned within the field windings which produces a small ac voltage of around 1 to 5 volts and as the unit is very unstressed there is very little that can go wrong with it. However the unit is held together by the black plastic end cap, this end cap is where it all goes wrong, for reasons unknown the caps start to come adrift as seen in the photo. This loosening of the end cap allows the stator shaft / field windings to move out of line not by much but enough to stop the output been produced. Annoyingly as the cap originally starts to slowly moves out, the shaft end float is still small enough for it to move in and out of the correct position and so causes it to work intermittently. So armed with this information all you need to do if faced with this problem is get the car jacked up and take a look at the end cap on the sensor, if it looks like the faulty one in the picture simply apply a layer of epoxy resin to the edge of the cap and push it back in, yes that simple, no need to even remove it, and you will have one fixed sensor for a tube of glue. Hope that is of help. Jeff TT”
Mike --------------------------------------------------------
  |
 |
