Jetta 2001 Automatic starts and stops.

The vehicle arrived on the other day, the fault began, it is scanned and does not throw codes the crankshaft sensor and that's fine, the immobilizer system works well.

Look do not give much information the mechanics we are technical, not apprentices or less sorcerers, but something else is needed, as if you have a spark in the cylinders, if the benzine pump effectively works after the start etc, you will understand that sometimes we are complicated in our work having the car there, so that it is difficult to see if there is a spark, then the fuel pressure One of those is ok