Failure with an A4 jetta

My car does not start, it is an A4 jetta, I already changed the relay and in the scanner marks. P0685 Open Sirchite. Helpmen. I notice anything or spark or pulses or gasoline pump.

Do you have a spark? Do you have injection is fuel in the injectors? Do you only stop or give any fault?

Icanso first of all thanks for participating in the forum and I put myself to your orders look I do not have enough data I would like to know that you changed because apparently according to the one that should be changed is the one that feeds the computer of your vehicle because apparently you have no feeding signal because you are not sending any signal to the actuating elements such as the gasoline pump the injectors and the coil Not being sending the signal to activate these

Friend a question which is the relay that feeds the computer I have an A4 2005 jetta and the fault is that in the morning when scouring as it lacks power and sometimes it goes out. Sometimes also when the revolutions starts to 0.5 and after walking a while the erros that marked the scanner was the P 1601 something like lack of power that you think

In Volkswagen, the P1601 failure is a feeding failure, usually the relay burns. It is in the area of ​​the left side engine of the vehicle takes one by one and you check it out by 85+ and 86-.
Among the others must give you continuity.

It is a typical failure if you do not want to spend money because you are not sure you change one for another that is the same and if the fault changes you already know what the rel.