Peugeot Boxer 2.8 Hdi - It did not start, the pump did not work, it does not cha

I warmly welcome. I hope you will help. I am looking for, looking for, combining, maybe smarter people with experience will lead me to something

Patient: Boxer 2.8hdi, 2005.

So far it has worked perfectly. Around December, after a week's stoppage, it did not start. He shook healthily, but did not fire.
The mechanic invented stupid things, and he did nothing with the car, so I fight at home.

1. The computer showed errors: Fuel Pressure Regulator and immobilizer error (u1600)
2. I have replaced the fuel filter and regulator with a new one.
3. The car still turned healthy but did not start. There was no minus in the fuel pump power cube.
4. I pulled the minus ankle out of the tank mass. I vented, fired.

And now interesting facts:
-Battery control is on, there is no charging. I measured 12.3V
-When I turned on the lights, the engine stopped. After restarting, the lights can be turned on normally, the engine will not go out.
-I put in 1st gear, the engine stopped. After restarting, the gears can be engaged as normal, the engine remains on.

-Other electrical equipment works without a problem.
-I haven't gone on the street yet (I'll try tomorrow), so I don't know yet if some emergency mode is hitting him. (turns well)
"It feels a bit louder than it was before it was immobilized." It may seem to me that I haven't listened to it for 2 months.
- There is a non-original alarm in the car, apparently unplugged. Pear with a key under the hood and a box by the fuses in the cabin. I have never used it.

And so I am trying to ... put on the immobilizer or this alarm ... maybe look somewhere else. Unless it is a mega coincidence and during a long stop, the alternator collapsed. But I worry about it going out after shifting the gear and the lights.

Help wise heads

Greetings Marcin.

marcin33morawiec wrote:

1. The computer showed errors: Fuel Pressure Regulator and immobilizer error (u1600)
2. I have replaced the fuel filter and regulator with a new one.
3. The car still turned healthy but did not start. There was no minus in the fuel pump power cube.
4. I pulled the minus ankle out of the tank mass.

Hello, a little from the back and you are not doing it professionally, you see you did diagnostics and immediately replaced the parts, but you have already convinced yourself that this is not it. You added mass from the tank and why did you not look for it, why is it not there? The fact that it goes out in various circumstances is also a trail, you only need to check what is lost then (power, mass, any of the signals). The car is fully diagnosable, so there is a preview if, as you write, maybe immo is blocking, or maybe this additional alarm cuts something off. Find this alarm, check if it is and what the protection is on.