Objectives 652 Body Electrical Diagnosis Final Student Performances Terminal Objective (Terminal FSP) Given a vehicle with any of the conditions listed below, the appropriate tools & equipment, and access to the vehicle’s EWD, the technician will be able to use the six-step diagnostic process to identify the type of fault and its location, and explain/demonstrate the correct repair procedure. • Short-to-ground • Open in a non-MPX circuit • High resistance in a non-MPX circuit • Feedback Problem Technician Objectives (FSPs) Course 652 Body Electrical Diagnosis 1.
Given a 2010 Camry "Back-up Light System Circuit" the technician will be able to predict voltage, amperage, and resistance values at various locations on the diagram under a variety of conditions (both normal and abnormal operation) and based upon the principals outlined below: Series Circuits • When there is only one load in the circuit, all the voltage is used up in that load • When there are multiple loads in the circuit, voltage is divided according to the resistance of the loads.
The load with the most resistance will use the most voltage; the load with the least resistance will use the least voltage; The voltage used is directly proportional to the resistance • Amperage is the same throughout the circuit. This means that an ammeter can be connected anywhere in the circuit and measure the amperage • Total resistance is the sum of all the resistance in the circuit. Adding a resistance in series will increase the total resistance and decrease current (amperage) Parallel Circuits • The voltage applied to each branch of a parallel circuit is the same. • The current in a branch is determined by the branch's resistance.
The branch with the least resistance will have the most current. • Total resistance decreases as branches are added. Adding a branch lowers the total resistance and increases current. The total circuit resistance is always lower than the lowest branch resistance Series-Parallel Circuits • Problems in the series portion of a series-parallel circuit affect the entire circuit. Problems in a parallel branch of a series parallel circuit affect only the branch where the problem is located Technical Training c