1E-6 Electronic control fuel injection system (Common rail type) About colors of wirings All harnesses are identified by using different colors of claddings. The harness for the main circuit in a certain electrical system is identified by using a single color, while the harness for the sub circuit uses a color in stripes. Sizes and colors coding in a wiring diagram are as follows. e.g. Red (stripe color) Green (base color) Harness size(0.5mm ) 2 Name 1. Single color 2. Color stripe Symbol Color Symbol Color B Black BR Brown W White LG Light green R Red GR Grey G Green P Pink Y Yellow SB Sky blue L Blue V Violet O Orange