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![]() Automotive Technology 4th Edition Free Download For Windows 10338 Chapterhaptehapter 22TestsElectrical After studying this chapter, you will be able to: ❚ Use a systematic approach to fi nd and correct electrical problems. ❚ Explain causes of basic circuit problems given their symptoms. ❚ Use testing devices to check component operation. ❚ Use a multimeter to measure circuit voltage, voltage drop, resistance, and amperage. ❚ Test basic electric and electronic components. Basic circuit testing skills are essential to today’s automotive technicians. Knowing how to analyze circuit problems and use basic test instruments are fundamental skills. This chapter introduces basic circuit problems, explains their causes, and summarizes the tests needed to find and correct malfunctions. Basic Circuit Problems Almost all electrical and electronic problems are caused by something in the circuit that increases or decreases current, resistance, or voltage. For exam- ple, a broken wire could stop or decrease current, or a charging system problem could increase output voltage and current. Unfortunately, when a basic circuit problem occurs in a complex circuit, such as a computer con- trol system, it may not seem so simple. For example, a poor electrical connection in a feed wire to a sensor can cause a false signal to return to the computer. The computer, reacting to this signal, might then alter the operation of the fuel injection system, emis- sion control system, or ignition system. A technician might think that any of these systems or the com- puter itself is at fault. Several systems may appear to have a problem. In reality, all of the problem symp- toms are caused by a poor electrical connection in one wire. As you can see, it is important to keep an open mind when diagnosing electrical problems. If ana- lyzed properly, problems can usually be found and corrected easily. Electrical Diagnosis and Repair Electrical diagnosis involves using a logical sequence of steps to fi nd the source of an electri- cal problem. Before you begin troubleshooting, you should verify the symptoms and problem to be sure that the customer has described the trouble accurately. Frequently, the vehicle owner or service writer may not completely describe what is wrong with the vehicle. Verifying the problem may give you added information when determining what to do next. See Figure 22-1. Basic Figure 22-1. Verify the problem before you begin the troubleshooting process. Comments are closed.
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