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
Diagnostic Methods provides detailed instructions on how to access or perform routine diagnostic tasks. Diagnostic Methods can be referenced for step-by-step instructions for routine procedures.

When performing alternative fuel diagnostics, the system may be checked by an off board tester referred to as a diagnostic tool. Diagnostic Methods contains instructions for performing diagnostics with the diagnostic tool. Specific diagnostic functions may be selected from a displayed menu, otherwise refer to the manufacturer's information.

Customer Information Worksheet:





Bi-Fuel Driveability Diagnostic Form:






Utilize the Customer Information Worksheet and the Bi-Fuel Driveability Diagnostic Form, to record customer and test data during diagnosis, or before contacting Hotline for technical assistance.