Pinout Link ((install)) | Isuzu 4hl1 Ecu

Report: Isuzu 4HL1 ECU Pinout

  • Crankshaft position sensor: ECU pin 3 (CKP) to sensor pin 1
  • Camshaft position sensor: ECU pin 4 (CMP) to sensor pin 1
  • Oxygen sensor: ECU pin 5 (O2) to sensor pin 1
  • Injector 1 (Pin 12): Fuel injector 1 control
  • Injector 2 (Pin 13): Fuel injector 2 control
  • Injector 3 (Pin 14): Fuel injector 3 control
  • Injector 4 (Pin 15): Fuel injector 4 control

Elias had already checked the mechanicals. The compression was perfect. The fuel lines were clean. He knew the problem was electrical, buried deep in the wiring harness or the ECU itself.

ECU Pinout:

“For the 4HL1 Hitachi ECU, see attached. Saved my Elf.” isuzu 4hl1 ecu pinout link