Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Basic Knowledge Required

A basic knowledge of the following items is required for use of this section:
(Use of the diagnostic procedures will be difficult without this basic knowledge.)


Basic Electrical Circuits
An understanding of the following concepts is required:
^ The basic theory of electricity
^ The meaning of the following terms:
- The voltage
- The current (amperes)
- The resistance (ohms)
^ The result of an open or shorted wire in a circuit
^ How to read and understand a wiring diagram


Use Of Circuit Testing Tools
An understanding of the following concepts is required:
^ The use of a Digital Multimeter (DMM)
Knowledge of the controls and their correct use is required.

Important: Use a solid, unpainted chassis ground or the negative battery cable when measuring the resistance to ground.

^ How to measure the value of the following items:
- The voltage
- The resistance
- The current
^ The correct use of jumper wires for the following purposes:
- Bypassing components
- Testing circuits