The baby refuses to start...

#1
Hi everyone. New here.
I hope to get some advise from you on my case. I parked my Corolla one evening and the next morning she refused to start. Here is what are the symptoms and what I have checked:
- there was "check engine" on - checked: P0171 code - cancelled
- starter runs but the engine does not start
- fuel tank is full
- got down to the fuel pump - checked - runs ok
- fuel gets out of the fuel line behind fuel filter with good pressure (finger tested)
- checked spark plugs - spark OK
- checked EFI relay - ok
- disconnected injectors, cranked the engine - fuel comes out

I am running out of ideas. Help, please!
The model is 2001 Corolla 1.4 VVTi hatchback 3 doors.
 
#2
An update: after everything above has been done, I have connected a computer to OBD port for further diagnosis. No faults were found, but surprisingly the engine stated. I have no idea what has happened but am happy anyway.
 
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