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
in Wiring Systems. Additionally, electrical/electronic
courses are offered through General Motors Service Training.
Basic Electrical Circuits
| • | You should understand what happens in a circuit with an open or
shorted wire. |
| • | You should understand what happens in a voltage circuit with an
open or shorted wire. Refer to
Measuring Voltage
in Wiring Systems. |
Use of Circuit Testing Tools
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.
| • | You should be able to use and understand how to work with a scan
tool. Refer to scan tool manual for complete information or
Scan Tool Diagnostics
in this ABS section for more
information. |
| • | You should be able to measure voltage, resistance and current. |
| • | You should know how to use jumper wires to bypass components for
testing circuits. Refer to
Using Fused Jumper Wires
in Wiring Systems. |
