ABS sensor revisions/compatibility

[Marc_986]

Indeed, early sensor model is inductive, later model is hall. Different sensor, different electronics altogether. Splicing is no use.

The early style sensor is used on the ABS5.3 units, the newer ones on the ABS5.7.

Teeth should be the same.

So you could also swap the ABS unit out to a 5.7 and swap the front sensors ;-) Oh, that wiring has many differences as well, most obvious ones being the connector on the ABS and that speed is send over CAN instead of a dedicated VSS signal.

For you, by far the easiest is to get a correct sensor. You could get a used one, but most dismantlers keep them in the wheel carrier for obvious reasons. I managed to get some wheel carriers for under $50 which included the sensors. Cheaper than a new sensor it seems

[strtnz]

Originally Posted by Marc_986

Indeed, early sensor model is inductive, later model is hall. Different sensor, different electronics altogether. Splicing is no use.

The early style sensor is used on the ABS5.3 units, the newer ones on the ABS5.7.

Teeth should be the same.

So you could also swap the ABS unit out to a 5.7 and swap the front sensors ;-) Oh, that wiring has many differences as well, most obvious ones being the connector on the ABS and that speed is send over CAN instead of a dedicated VSS signal.

For you, by far the easiest is to get a correct sensor. You could get a used one, but most dismantlers keep them in the wheel carrier for obvious reasons. I managed to get some wheel carriers for under $50 which included the sensors. Cheaper than a new sensor it seems

Where do you find all this information from? I'd love to be able to have all this sort of knowledge on tap!

[strtnz]

Originally Posted by piper6909

Looks like the sensors may send a different signal entirely. It could be your 2000 has a passive sensor and the 2002 has an active sensor. One sends A/C current in a sine wave while the latter sends a digital square wave. If that's the case, you'll get an error code regardless of the tooth count on the ring. So, you're stuck with having to get the correct sensor.

Here's a helpful video:
https://www.youtube.com/watch?v=LC3jCyHjWqo&t=155s

Very helpful, thanks. I'll try to measure the signal voltage but it seems inductive type need a supply voltage so that may not be so simple, but I think it's worth a try to see if they're both in the same range.

Given the other comments I'm not expecting them to match up, but it's a fairly easy step to do anyway.

[Marc_986]

I happen to have done a bit of research on the ABS systems for my project car. I'll be swapping ABS 5.7 into my early ('97) boxster.

But to answer your question;
- This forum has a lot of information. Not always in full detail, but at least giving direction
- Bentley manual
- Porsche parts catalog