Isuzu 4hl1-1 Ecu Pinout -
The full factory wiring diagram is 20+ pages. If you drop your and ECU part number (starts with 8-971xxxxx-0) in the comments, I may have the exact pin assignment for your chassis.
Pin functions can vary by VIN and market (Japan, US, Australia, Middle East). Always verify with a multimeter before pinning out sensors or cutting wires.