I have one of these shocks on my M109 and when it first arrived the CDT switch did nothing but I had super plush travel but with next to no platform and it doesn’t have a trail adjust which I think is the black switch referred to above. I took it back to the dealer and after much squishing and pedalling up and down the road the decided to send it back to Mojo under warranty as there is a dodgy batch of these shocks where the CTD didn’t work and it’s not the first time they’d seen it. The next day I received a call from the shop saying that Mojo had called to say that they had the shock in the dyno and it’s working as designed but they offered for me to call the guy at Mojo to discuss the options. After chatting with the seemingly very knowledgeable man at Mojo for about half an hour it turned out that they get a lot of shocks back like this that ‘don’t work’ and it’s because the frame manufacturers are specing the shocks with very light tune, in my case it was light in compression and return (I forget what the actual term was he used) and ‘only’ 200psi in the boost chamber (again, can’t remember exact term), after a discussion about my riding I now have a shock with medium tune in both directions, Kashima upgrade and 300psi of boost. The CTD switch works a treat giving ever increasing platform from D through to C. I only went for Kashima because apparently it can help with small bump sensitivity when the tune has been increased, kind of makes sense.
The reason the guy from Mojo gave for frame manufacturers making this decision regarding light tune is so that the bikes feel super plush on carpark tests, cheeky monkeys!
My shock now works great and the service from Mojo was fantastic.