Objectives 623 Electrical Circuit Diagnosis 623 Electrical Circuit Diagnosis At the completion of this course the Technician will be able to:
• Identify the various types of automotive electrical circuits • Use a DVOM and the GR-8 Battery Diagnostic Station • Predict normal circuit characteristics and apply Ohm’s Law to an electrical problem • Demonstrate the methods to check continuity, and measure voltage, current, and resistance in any electrical circuit • Perform tests to determine the integrity of the battery, starting and charging systems in an automobile Electrical Principals • Define voltage, current, resistance and power • Apply correct units for voltage, current, resistance, and power • Define Ohm’s Law and explain the relationship between voltage, current, and resistance Measuring Electricity • Demonstrate the proper DVOM setup to measure voltage, current, and resistance using a DVOM and an inductive clamp • Explain meter value ranges and be able to convert voltage, amperage, and resistance values • Demonstrate the use of the DVOM to check diode operation • Distinguish between source voltage, available voltage and voltage drop • Calculate power from voltage and current values Electrical Circuits • Identify the elements of a basic circuit • Identify common electrical symbols used in automotive electrical wiring diagrams • Distinguish between the different types of circuits • Identify series, parallel and series-parallel circuits and circuit segments • Explain the rules for the electrical operation of series and parallel circuits • Demonstrate how to measure voltage, check continuity, and make resistance measurements in series and parallel circuits • Apply Ohm’s Law to each type of circuit and use it to predict circuit behavior and anticipate test results • Identify and isolate an open circuit and a short to ground in a circuit • Recognize standard electrical symbols and know where in the electrical wiring diagram to reference unfamiliar symbols • Use a wiring diagram to predict available voltage and voltage drops in a circuit Demonstrate how to use voltage drop testing as part of electrical circuit diagnosis • Determine if a control device is located on the source side or the ground side of a circuit • Trace current flow through a circuit • Demonstrate the “split-half” method to isolate a circuit fault • Develop a strategy and diagnostic approach to deduce a circuit fault Technical Training c