Cylinder 4 M110 D-Jet engine does not work

Goodnight,I have problems with cylinder 4 of an M110 D-Jet. There's a spark, but I don't know if the injector is injecting. It was in the manual and I came across something strange. According to the sparking sequence 1 5 3 6 2 4 and the corresponding pulses of the ECU ports 3 4 1 6 5 5. How does the ECU circuit pulse the injectors 2 and 4 through the same port? I did not understand! See attachment. Thank you in advance!

Hi Unknown,

please read jetronic.org/en/d-jetronic/pinout#mb6 . ECU injects in 2 groups only.