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[Cybertrucker]

Ever since I bought this car a couple of months ago the speedo, and anything else requiring a speed input from the ABS ECU, hasn't worked.  The perplexing thing is that the ABS light hasn't been coming on, so the ABS itself has obviously been happy that everything is okay.

This morning, however, the ABS light started to come on.  It goes out at startup, as it should, but then it comes back on again afterwards - I did a bit of quick testing and it seems to come back on once the car has got up to some sort of speed.

So, some questions, if the more knowledgeable members on here could help me out:

Does the fact that it initially goes out but comes back on once the car has reached a certain speed suggest that one of the wheel sensors isn't feeding to the ABS, and the ABS realises that it's not possible to have three wheels going round and not the fourth?

Could there have been a fault for some time with the NSF sensor which prevented the speed signal being sent to the other parts of the car, but which the ABS didn't recognise as a fault, but which has now got worse so it is being picked up by the ABS?

Can my car be paperclipped, and if so will it give me ABS fault codes or just engine management ones?


Any advice/suggestions would be most welcome, because I don't really know where to go next with this ABS/speedo problem.

[TheBoy]

Pre 1998 ABS ECUs are pretty reliable to be honest, so might be worth getting a decent code reader on it.  Most generic readers won't read the ABS codes.

[Chris_H]

Cleaning the sensors is worth a try and costs no wonga provided you don't break one.
You can probably answer one of your questions by driving the car with one sensor removed and tied out of the way?