Before using this section, it is important that you have
a basic knowledge of the following items. Without this basic knowledge, it
will be difficult to use the diagnostic procedures contained in this section.
If you need a review of basic electrical troubleshooting knowledge,
Refer to General Electrical Diagnosis Procedures in Wiring Systems. Additionally,
electrical/electronic courses are offered through General Motors Service Training.
Basic Electrical Circuits
| • | You should understand the basic theory of electricity and know
the meaning of voltage, current (amperes) and resistance (ohms). |
| • | You should understand what happens in a circuit with an open or
shorted wire. |
| • | You should be able to read and understand a wiring diagram. |
Use of Circuit Testing Tools
| • | You should be familiar with the Digital Multimeter (DMM) J 39200
, and be familiar with
the meter controls and how to use them correctly. |
| • | You should be able to measure voltage, resistance and current. |
| • | You should know how to use jumper wires to bypass components for
testing circuits. |
| | Important: When measuring the resistance to ground of circuit or component, make
sure to use a solid, unpainted chassis ground or the negative battery terminal.
|
