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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KP9 - Remove Octane Adjust Shorting Bar



- Remove Octane Adjust (OCT ADJ) shorting bar only if there is a Technical Service Bulletin (TSB) authorization.

- Drive vehicle to verify spark knock.

- Is spark knock present?

Yes -- Go to KP10. KP10 - Check Octane Adjust Circuit For A Short to Ground

No -- Testing complete. Electronic Engine Controls (EEC) system OK.