Hi, just wondering if anyone can shed some light on this for me. I have a friend who is using this car as a basis for a kit car project. He has systematically removed wiring from the loom whilst driving it in and out of his workshop in a bid to cut down on the wiring he will use for the project. He has now removed the engine and box and finds there is what looks like an abs sensor on the short drive shaft, with an abs ring on the shaft. The sensor is fitted and wired into the loom. The car does not have abs or traction control fitted.Does anyone know what this is for. He has asked the ex Rover main dealer and they are of no help what so ever. I offered to ask here as there maybe a Rover whiz who can help. The last question is can it be disconnected without detriment? Thanks in advance and hope you all had a good crimbo and may i wish you all a happy and prosperous new year.

Hi Vince,

How about the Speedo.

Regards Mark

It has the electronic speedo in the gearbox.

Hi Vince,
In that case I don't know, I can only assume that the vehicle has two separate speed sensors.

One for the speedo and one for the Engine management system.

Although as I type, that sounds more lame the more I think about it.

Let's hope someone comes up with a better idea.

I own a couple of 25's for my sins, if I get time I will have a look and see if mine are the same and get back to you.

Regards Mark

Hi,

the sensor you have found is probably the 'rough road sensor'.
The ecu uses this wheel speed sensor to determine as it's name implies bad road surfaces which can cause transmission snatch.
This can leads to variations in crankshaft speed which in turn may be seen by the ecu as a engine misfire. The ecu can then inhibit the misfire diagnostics under various road conditions or if the signal is constant (rough road sensor) use this as a proof for engine misfire diagnostics.

HTH

Teckie2

Thanks Mark,
That was what i thought as well, but the more i think of it the less i think of the idea!
Vince

Thanks Lance, thats a new one on me. Will disconnecting it put the ecu into limp mode? To me ,based on your description it will.
Vince

Lance's idea sounds more than plausible.

Regards Mark