Isuzu 4hl1-1 Ecu Pinout

Isuzu 4HL1 Workshop Manual (Engine Control System) : Contains full-circuit diagrams for the ECM and VIM.

The 4HL1-1 utilizes a (often ECU part numbers starting with 8-97360 or 8-98143). Unlike older mechanical diesels, this ECU controls: isuzu 4hl1-1 ecu pinout

| Pin | Protocol | Function | Location | | :--- | :--- | :--- | :--- | | | K-Line (ISO 9141) | Diagnostic request/response | Usually goes to DLC Pin 7 | | B-43 | CAN High (CAN H) | 2.5V nominal, 3.5V dominant | Chassis communication | | B-44 | CAN Low (CAN L) | 2.5V nominal, 1.5V dominant | Chassis communication | | B-49 | Tachometer Output | Engine speed signal | 12V square wave (to dash) | | B-56 | Check Engine Light (MIL) | Ground trigger | 0V when light is ON | Isuzu 4HL1 Workshop Manual (Engine Control System) :