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 colours are listed in a table at the end of this section. Where wires have a predominant colour with a secondary colour tracer, the main colour is identified first, i.e. LGS - light green with a slate tracer.

Splices







The splices (and where appropriate, the header) circuit pages show the full interconnectivity of components and systems.

NOTE: The splice information shown on individual system circuits is not complete. Always refer to the splices circuit pages for complete information for each splice.

Wire length (Splices, Power and Ground Distribution only)
The wire length (in millimetres) is displayed after the colour 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 480 mm from connector C2335.

Wire Types







Multicore wires are identified by the prefix M suffixed by three or four other letters, for example MCGA, MAPN. The suffix precisely defines the parameters that comprise the specification of the wire type. The specification is defined during the design process of an electrical system, therefore it is imperative that the correct specification is maintained to ensure the correct operating characteristics and continued functionality for a given system.

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.

Colour Codes