ABS / TC issues

Hi
I have had an intermittent issue where the ABS / TC lights come on and have tried to diagnose this but without sucess. More recently I can feel the the brake "pumping" when I break, but as soon as I get the ABS/TC lights this stops so I am guessing all related. I have done the following

Plug in Nanocom
Start the car
Connect to the ABS ECU and read faults - there are none.
Select "inputs" and drive the car

This is where it gets interesting, initially the read outs work but almost as soon as the ABS/TC lights extinguish I get "unable to perform function" on the nanocom. I stop the car (engine still running) and try to reconnect tot he ABS its won't connect at all, only a turn off / on will reset this.

I thought this sounded like the ECU so have just tried a brand new unit but the issue persits.

So can anyone confirm that normally a nanocom (evo) would read this data properly, and secondly has anyone got any suggestions as where to start looking.

Thanks

Try looking on the blackbox forum mabey you ain't doin it in the right sequence

Do you have Wabco C or D. What year is the car. Wheel speed is only measurable if wheel is turned by hand, communication is lost with ECU above 1.6 MPH.

It's a 2001 4.6. Ok the losing communications above 1.6 is useful to know. Thanks. I'm not sure how to identify C or D. The ABS ECU is SRD100501

Ok checked some more and can confirm its a type D.

mickwall said:

Ok checked some more and can confirm its a type D.

Click to expand...

If it's after 1999 it's type D 4 wheel TC.

http://www.nanocom-diagnostics.com/downloads/2146228122.pdf

Yes that's what I found to confirm it. Cheers

Just to complete the thread. This has turned out to be a failed rear wheel sensor. Diags did not locate it trial and error won the day!

mickwall said:

Just to complete the thread. This has turned out to be a failed rear wheel sensor. Diags did not locate it trial and error won the day!

Click to expand...

It should have show on live data.