What a coincidence that you should mention the EHA. I neglected to state that when the car first started having these problems, the EHA had started to leak and I had to replace it.(new one) I forgot to mention that....
So I will go unplug the valve and see if it makes any difference. But what will I be looking for? How do I test to see if the signal is wrong or not? Does that show up as a fault code?

Thanks,
Nathan