I'm trying to code in a set of injectors using my DS708, I've programmed in heaps of injectors on various models of cars before and never had a problem, so hopefully this'll be an easy fix.

After I write in the new codes and press start, the DS708 goes to a screen which says 'cannot communicate with module', tells me to make sure IGN is on and stuff like that. When it does this though, it codes in injector one ok, but not two,three or four. I've tried coding them in individually, with the same result, number one will code, but not the others and will still come up with a communication error with the ECM. 

Last week I carried out a DPF Regen on the same vehicle, so I assume communication isn't an issue.

Thanks in advance

James