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)

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Diagnostic Methods Overview

OVERVIEW

The Diagnostic Methods provide information on routine diagnostic tasks.

When following powertrain diagnostics on OBD II vehicles, the system may be checked by an off-board tester referred to as a scan tool. This contains information for performing diagnostics with the New Generation Star Tester and a generic scan tool. A generic scan tool has a capability that is standard across the automotive industry in the United States. If a New Generation Star Tester is used, functions are selected from a menu.