wiring wheels speed to pin8, from an abs ring

[boostd audi]

i have a vw and I thought I did this before, but my car had the ps2 wire.  now my new ecu has wheelspeed on pin8 built in.

I want to get the wheelspeed input from a non power driven wheel using it abs sensor ring.


I bought the vr/hall adapter for wheelspeed .
i am assuming i solder my abs sensor to the adapter converter
then plug it into a db9 that has ground, +5, and wheelspeed signal (pin8). from ecu.

i hope this is right.  thanks for the help in advance

i wired like this and i have not gotten any signal out of the abs ring.  what am i doing wrong??

[boostd audi]

what divider did you have the solder blob in the converter, using a vag abs ring?

i believe the abs ring from this vw has ~45 teeth so i am guessing i need the divby4 not by 8

[boostd audi]

man this forum has died.

I think I have it wired right. im going to try changing divider this weekend and hopefully I can get it working.

[mattias]

Oscilloscope.

[VEMS]

Hello Boostd Audi,

In verifying the chain from ABS ring to ecu, its best to split in a few separate easy checks:

1) Measure VR sensor resistance, without  VR/Hall converter connected with DVM (Digital Volt Meter) in resistance mode (0-2kohm)
2) With DVM measure in AC voltage mode (0-2v), the voltage across VR+ and VR- of abs sensor without the VR/Hall converter connected to it, while turning the wheel as fast as possible by hand
3) Verify if the correct divider setting jumper is soldered
4) Verify wiring/connection to VR/Hall convertor (pin#1: 5v, pin#4: signal out, pin#5: GND)
5) When turning the wheel by hand verify (if possible by scope but DVM (in DC voltage 0-20v) should do at these low speeds), if you see alternating high and low voltage state.

If you can get back to me with readings/measurements and observations from tests above i can help you diagnose why it is not operating as intended.

Best regards,


Dave

[boostd audi]

thanks guys.

I didn't have the scope with me when I wired it.  I am going to see my buddy this week to test it and hopefully get it dialed in.