I hope I am not rehashing a topic already discussed, I did try searching...
I was hoping perhaps one of the tech gurus will have an answer before I go blindly troubleshooting with a multimeter.

I have a track car which has seen many modifications. For starters it's an LS swapped car, which last year had all gauges working (separate thread altogether). This year I stripped down the braking system, i.e. removed the ABS control module and installed a Wilwood proportioning valve and re-ran the lines, I did not touch ABS sensors (in the front).
I also modified the rear subframe and dropped in an 8.8 Cobra diff. While doing this I was not able to get the ABS sensors removed so I cut the wires, and then re-soldered upon installation.
Bottom line, my speedo is not working after these 2 interventions.
So my questions are:

Does removing the ABS module screw with the ability of the CanBus to read speed signal from the sensors? If so, is there a fix (ABS module connector is still intact)?

Is it just my shitty soldering and beating on the rear hub sensors perhaps? If so, is there a way to test the ABS sensors?

Any advice much appreciated, thank you in advance.

 

The sensors send wheel speed info to the ABS module, so you need that back in. I haven't messed with ABS at all, but I imagine it can live and think it's doing something useful without being connected to the brake system.

 

What are you using for an ECU?

Dash? Stock?

You should be able to get raw analog data from the speed sensors... but it won't be converted to CAN without the ABS module.

Your ECU may be able to output a CAN signal to the stock dash if it can deal with the frequency data from the wheel speed sensor and convert it into.a CAN signal

 

i suggest the following.

Before you remove it make sure you make a log file with:

0x212;
0x204;
0x4C0;

0x4B0; Wheel speed + 10K
0x4B1; Wheel speed

These 5 CAN Pids; are what the MCU needs to see, for speed and for not triggering the CEL about ABS not communicating.
Now when you know the healthy 8 bytes of them please share since i'm looking for them :D.

The wheel speeds are 0-1, 2-3, 4-5,6-7 so they are ints (2bytes) in 1/100 km/h (except 4B0 which is offset by 10000);