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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NGO Signal Command

Display shows GASOLINE or ALT. FUEL. This display monitors the AF ECU NGO Enable circuit output driver. Alternative fuel operation is requested when the AF ECU grounds the NGO Enable circuit to the gasoline control module.