HOSE AS 4179067 - Caterpillar

Harness Wire Identification
Caterpillar identifies all wires with 11 solid colors. The circuit number is stamped on the wire at a 25 mm (1 inch) spacing. Table 1 lists the wire colors and the color codes.
Table 1
Color Codes for the Harness Wire    
Color Code     Color     Color Code     Color    
BK     Black     BU     Blue    
BR     Brown     PU     Purple    
RD     Red     GY     Gray    
OR     Orange     WH     White    
YL     Yellow     PK     Pink    
GN     Green            For example, a wire identification of X925-PK on the schematic would signify a pink wire with the circuit number X925. X925-PK identifies the power supply for the No. 1 injector.Note: Always replace a harness wire with the same gauge of wire and with the same color code.Note: In the following diagrams, "Pxxx" signifies a plug and "Jxxx" signifies a jack.Schematic Diagrams
Illustration 1 g02362076
Schematic diagram of the engine connections to the J2 connector on the ECM
Illustration 2 g02362277
Schematic diagram of the NRS equipment
Illustration 3 g02362256
Schematic diagram of the Clean Emissions Module (CEM) Sheet 1 of 2
Illustration 4 g02362216
Schematic diagram of the Clean Emissions Module (CEM) Sheet 2 of 2
Illustration 5 g03888259
Schematic Diagram for a Typical Application