Important: When measuring the resistance to ground of a circuit or component, use
a solid, unpainted chassis ground or the negative battery cable terminal.
A basic knowledge of the following items is important for the use of
this section. (Without this basic knowledge, it will be difficult to use the
diagnostic procedures contained in this section).
Basic Electrical Circuits
| • | The basic theory of electricity |
| • | The meaning of the following terms: |
| • | Understanding of what happens in a circuit with an open or shorted
wire |
| • | How to read and understand a wiring diagram |
Use of Circuit Testing Tools
| • | How to use jumper wires to bypass components in order to test
circuits |
| • | How to use the High Impedance Multimeter (DMM) J 39200 |
| • | How to measure the following quantities: |
| • | How to use the meter controls |
Refer to
General Electrical Diagnosis
in Wiring Systems
for a review of the following items:
| • | Basic electrical troubleshooting knowledge |
| • | Basic use of circuit testing tools |
Additionally, General Motors Service Training offers electrical/electronic
courses.
