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We use wiring diagrams in quite a few diagnostics, but when we are really not careful, they can bring us for making decisions which are not accurate, trigger wasted diagnostic time, unnecessary parts costs for that replacing parts that aren't defective, and even missing a basic repair.
Today, the wiring diagram required to support confirmed repair procedure is roofed within it or a keyword rich link is supplied to the appropriate SYSTEM WIRING DIAGRAM article. One example is, the wiring diagram for any Ford EEC-IV system may very well be found in ENGINE PERFORMANCE and WIRING DIAGRAMS articles for Ford Motor Co. The wiring diagram for your cruise control system can be a part of ACCESSORIES & EQUIPMENT section for the actual vehicle manufacturer, and also the wiring diagram for the anti-lock brake system can be built into BRAKES and WIRING DIAGRAMS for the unique manufacturer.
Within my recent multi-part series on automotive electrical systems (which included primers on how electricity works and how to utilize a multimeter), I gave this quick troubleshooting example in which I often went a multimeter to make sure that that voltage was present. When a device—say, a power motor—isn't working, first determine whether voltage is reaching it when the switch that powers the system is turned on. If voltage is present at the device's positive terminal, test for continuity between the wire towards the device's negative terminal and ground (first the body of the car, and so the negative battery terminal). Whether or not it passes those tests, conduct a voltage drop test to check out a superior resistance failure. In case the voltage drop test shows no trouble, the set up is toast.