RENR5042-02 13 Troubleshooting Section C15 and C18 Engines g01099949 Illustration 4 (1) Coolant temperature sensor (2) Secondary engine speed/timing sensor (3) Boost pressure sensor Locations of the sensors on C15 and C18 engines (4) Fuel pressure sensor (5) Fuel temperature sensor (6) Intake manifold air temperature sensor (7) Engine oil pressure sensor (8) Atmospheric pressure sensor (9) Primary engine speed/timing sensor i02285382 Engine Wiring Information Table 5 SMCS Code: 1408 The wiring schematics are revised periodically. The wiring schematics will change as updates are made to the machine harness. For the most current information, always check the revision number of the schematic.
Use the schematic with the latest revision number. Harness Wire Identification For example, a wire identification of A701-GY on the schematic would signify a gray wire with the circuit number A701. A701-GY identifies the power circuit for the No. 1 Injector solenoid. Caterpillar identifies all wires with eleven solid colors. The circuit number is stamped on the wire at a 25 mm (1 inch) spacing. Table 5 lists the wire colors and the color codes. Another wire identification on the schematic is the size of the wire. The size of the wire will follow the wire color. Wire size or gauge is referred to as AWG (Americal Wire Gauge). AWG is a description of the diameter of the wire.
Color Codes for the Harness Wire Color Code Color Color Code Color BK Black GN Green BR Brown BU Blue RD Red PU Purple OR Orange GY Gray YL Yellow WH White PK Pink