986 Different ABS versions

[Marc_986]

Hi All,

Where can I find which ABS versions were used in the different model years of the 986. Bentley suggest that starting from 2002 ABS 5.7 was used (former 5.3). It does not have wiring diagrams for 2002 and beyond.

I have a PDF with diagrams for supposedly all model years and the 2002 diagrams is slighty different than 1998. I didn't check which year the minor change occurs. Number of pins and overall assignment is the same.

Starting 2003 it seems to have a plug with more pins. Still similar in the number of connections to the car, but it seems more logical for this to be the ABS 5.7.

I am not looking for the info on PSM / traction control etc, just bare ABS.

Thanks!

[JFP in PA]

Abs 5.3 1997-2001
abs 5.7 2001-2004

[Marc_986]

Thanks JFP,

Do you happen to know whether that is the same for US models / ROW?

[78F350]

Side note... A couple years ago I was helping someone find a specific ABS Module. I was amazed by how many different models there are. Small differences regardless of version number made all the units except for one incompatible with his car.

[JFP in PA]

Originally Posted by Marc_986

Thanks JFP,

Do you happen to know whether that is the same for US models / ROW?

You need to run the VIN number of the car to get the correct match.

[Marc_986]

Thanks so much.

So from the listed part numbers it does seem that the low pin count one is the 5.3, while the 5.7 has the higher pin count.

So where I am now I have the 987 rear wheel carriers on my 986 to be able to fit the 987 driveshafts (to fit the 987 gearbox). My car is an early 986, so it has ABS 5.3 with the inductive sensors (DF6). The 987 has the hall-effect sensor (DF11), just like the later 986 models with the ABS 5.7.

So to retain ABS functionality it seems I have two options;
1. Modify ABS 5.3 to work with the DF11 sensors. Both modules will have an input signal conditioning circuit. I would imagine the 5.7 would have a circuit capable of both sensors, but maybe it is just the hall-effect it supports. Swapping circuitry could be doable.

2. Upgrade my car to ABS5.7. Most signals connecting to the car seem very similar. I would likely loose the VSS signal, but there are ways to recover that.

Any options I am not seeing? (apart from motorsport ABS, which is out of budget anyway).