I have a new (to me) 1.2 cup that had the M4 ABS installed before I took ownership. I'm still trying to sort it to get it fully working.

It works for a while then about halfway through a 20 min session I get an ABS error on the Cosworth and ABS ceases to function. Normal brake function is fine (and frankly is great). Anyway - the error I see in the RaceABS cites lambda 6 (see screenshot). The ABS manual says timeout errors can be ignored. I can't find anything on lambda 6 though. I have emailed PMNA so will see what they say. Hoping someone's come across this. Thx.

 

Did you ever figure this out? I have an M5 MR system and it just did the same thing to me although I don’t have equipment yet to pull codes. The scenario you described was the same though.

 

Yep - my issue was the IMU wasn't tightened down sufficiently. This is the unit on the center tunnel that has 4 nuts onto bolts - the front 2 were tight, the back 2 were not and I think it allowed the IMU to provide erroneous input. At least that's my best guess as I did all the FW and setting updates PMNA suggested and still had the problem. But after tightening all 4 nuts for the IMU the ABS has worked flawlessly since.

 

Thanks for the info, will check today!