Question regarding a 2008 Touran, 1.4 TSI BMY, won't start, error code P2293

Hello,
I have a 2008 Touran with a 1.4 TSI BMY engine, with approximately 225,000 km on the odometer.
The engine is turning, but it's not starting. Error: P22893 - Fuel Pressure Regulator 2 - Missing Power.

High pressure build-up via OBD at 7-12 Bar in the rail during starting attempts. A minimum pressure of 40 Bar is known. Engine sporadically starts when starting, but doesn't really run.

My first idea was whether the high-pressure pump was faulty. I have exchanged, no change/improvement. (The shift lever is okay according to mileage, easy to operate, the camshaft has no visible signs of wear regarding tracks etc.)

Compression measured: Cylinder 2-4 ~9 Bar (cold engine), Cylinder 1: 15 bar. Fuel puddle in cylinder 1. Continuous Injector.
All injectors replaced. Still the same image, pressure still at 7 bar. But the pressure is now being held in the Rail.

Tax times: So far, the inlet camshaft seems to be in the correct position for OT, but the outlet camshaft is not in the correct position. That would be my next idea, but it doesn't directly relate to not reaching the minimum pressure, does it?

Does the system pressure always increase cyclically only shortly before the injection stroke, or must it be permanently present?

Hello,

The rail pressure should be built up sufficiently and held during the starting process. It is not just cyclically increased to the required value shortly before each injection cycle.

The high-pressure pump is driven mechanically by the camshaft. Pressure regulation is carried out via the fuel control valve and the engine control unit.

Since the high-pressure pump and all injectors have already been replaced, I would first check the following points:

Low-pressure fuel supply: Measure the pressure before the high-pressure pump during cranking. Is sufficient pressure present there?

Fuel control valve N276: Check the electrical activation, voltage supply, and wiring. Even with a new high-pressure pump, correct activation is crucial.

Rail pressure sensor G247: Check the measured value for plausibility, especially when the ignition is switched on and during cranking.

Timing: Check the position of both camshafts using the appropriate locking tools. If the exhaust camshaft is indeed misaligned, this must definitely be clarified.

Compression: The differences between the cylinders are noticeable. After checking the timing, I would measure the compression again and, if necessary, perform a cylinder leak-down test.

It would also be important to check the exact fault code designation. P2289 and P2293 describe different fault patterns.

The low-pressure values during starting, as well as the rail pressure setpoint, actual rail pressure, and activation of N276, would be interesting.

I would not start the engine further until the timing has been clarified, in order to avoid possible valve damage.

Regards,
Mihai

Thank you for the helpful tips! I suspect that the posting was in German, but the topic (and the language) was entered in English... I need to figure something out about that.