Understanding the Circuit Diagrams

Understanding The Circuit Diagrams

Components





After each component description, a translation code is displayed in brackets, for example: Starter relay (R102), Engine control-module (ECM)(D131). The codes can be ignored.

Note: A dotted outline indicates that the component identified is not shown in its entirety.

Connectors
Connectors and header joints are identified by their corresponding connector number with a numbered suffix to indicate the pin-out detail of the wire, i.e. C0292-1 identifies connector 292, pin number 1. Wire insulation colors are listed in a table at the end of this section. Where wires have a predominant color with a secondary color tracer, the main color is identified first, i.e. WH-BK - white with a black tracer.

Wire length (Power and Ground Distribution only)
The wire length (in millimeters) is displayed after the color and cross sectional area; for example, SR,0.35,480. In this example, the figure, 480 indicates the approximate position of the harness splice is 480mm from connector C2335.

Line Types





Crossed wires as illustrated above show an example of how a twisted pair of wires may be represented on the circuits.





The arrows illustrated above show an example of the page break symbols, identifying that the circuit continues at the corresponding letter on the sheet number indicated.





The cup and ball symbol represents the male and female halves of connector. Most connectors plug directly into a component but some are wired directly to the component using a flylead as with C503 above.

Ground points
Ground points are identified with an eyelet symbol and a connector number, except where components are grounded through its fixings, when only the eyelet is shown.

color Codes