Isuzu 727 N SERIES (4HK1 Engine) — Precautions on Service

Engine Control System 1A-3 Wire Color All wiring harnesses are identified using colored jacket. The wiring harness used for the main circuit in an electrical system is identified with single color while the wiring harness used for the sub-circuit is identified with color stripe. The following rule is used in each wiring diagram to indicate size and color of a wiring harness. Legend 1. Red (stripe color) 2. Green (base color) 3.

Harness size (0.5 mm 2 ) Abbreviation Original form Meaning in this manual EGR Exhaust Gas Recirculation Exhaust gas recirculation ISM Intake Step Motor Intake throttle valve drive motor ITP Intake Throttle Position Intake throttle valve opening MIL Malfunction Indicator Lamp CHECK ENGINE Lamp SPV Spill Control Valve Valve for high pressure circuit in the fuel pump SW Switch TCV Timing Control Valve Injection timing control valve in the fuel pump Key SW Key switch Starter switch eg. : 0.5 GRN / RED 1 2 3 LNW21ASH000101-X Symbol Color Symbol Color B Black BR Brown W White LG Light green R Red GR Gray G Green P Pink Y Yellow LB Light blue L Blue V Violet O Orange