I have been through and checked every thing again and still the same issue, "M122 B121
Error: M122: Response timeout: CAN addr 121, req type 6024, RID=15"
I believe I had it wired correctly in the first place. CAN-H on the mainboard to CAN-H Pin 4 onthe Toolboard, CAN-L on the mainboard to CAN-L pin 3 on the toolboard.
I also connected to pins 1 and 2 with the same result.
I have checked contrinuity of the cable from the back side of the mainboard to the back side of the toolboard to rule out connector issues and all good.
Resistance on both wires on the cable is 1 Ohm.
On the toolboard, Pins 1 & 3, and 2 & 4 are connected together and the resistance across each pair is 120 Ohms.
I have a new toolboard coming from the dealer in Melbourne and hopefully it will be here on Friday. (I am right at the other end of the country!).