It's been a while since i used this forum, but now i need some serious help.

The car started producing some hesitation one day, it rapidly became worse, included stopping and now it does not even start. Car is a 850 -96 GLT 20V.

Situation:
-Starter runs fine, engine cranks OK
-No spark, checked with the plug out and also with strobe lamp.
-No gas on the plugs, they seem dry
-Fuel pump produces 3bar (have no idea how many psi, but is OK) when ignition key in II
-No error codes. At least there were none earlier in the troubleshooting stage when i borrowed a diag tool

What i have checked or changed:
-Ignition coil OK
-Fuel pump relay changed
-Pump runs fine if fed with 12V (3 bar)
-Battery changed
-Plugs+cap+rotor changed
-Cam shaft sensor replaced with one from my other car
-Relays with "J" marking changed
-Checked the gray 40A relay above the radiator
-Checked ECU connector visually
-Checked various other connectors in the engine compartment

Questions:
-Crankshaft sensor, is it possible to diagnose this? I measured resistance at still engine to 270ohm, when the starter is running it went up to 295ohm. Is this the correct procedure or behavior?
-Immobilizer, does it only affect the starter or does it cut power to the ECU?
-Is it possible to to check that you have power to the ECU? Lots of pins...
-Is it possible to check the ECU stand-alone, i.e. out of the car?
-Is it possible to check the ignition module and/or feed to the ignition coil?


Any ideas?