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The Isuzu 4HL1 wiring harness usually interfaces with the ECU through two or more large connectors:
Interfaces with the ignition switch, battery power, and diagnostic ports. Common ECU Pin Functions
While exact pin numbering can vary by production year (e.g., 4HL1-1 vs 4HL1-2), the following table outlines the critical pins found in a typical Isuzu 4HL1 manual :
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