306 HDi Issue

shezads · Post by **shezads** » 05 Aug 2009, 11:37

I'am hoping someone has come across this before and is able to help.

We have a X reg 306 HDi (now on approx 127k) in the family. There is an intermittent fault, whereby the speedo will stop working all of a sudden.
It usually starts to work again after the engine is restarted. Not sure if the engine has to be left off for a while or not. At first I thought it was a speedo cable issue, but now think it may be an electrical issue.

There is another post on Honest John website referring to someone having a similar issue, but as yet there are no fixes. One poster has suggested checking the wireloom near the engine as this was the cause for the issue on a 406. I thought I would post in the hope someone can help.

Thanks

Post by **CitroJim** » 05 Aug 2009, 12:03

I think what Honest John was referring to the Vehicle Speed Sensor (VSS) which drives the speedo.

This is located down on the final drive of the gearbox in more or less the same place as you would have found the sppedo cable years ago. It is mounted on the RH (long) driveshaft housing and has a three pin connector going to it.

They do fail occasionally but it's worth checking the wiring as it's all a bit hostile down there for little electrical signals and French wiring