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

FG3 - Check For DTC 1390

- Replace OCT ADJ shorting bar.

- Key Off.

- Connect Scan Tool.

- Activate Key On Engine Off Self-Test.

- Is DTC 1390 present?

YES -- Go to FG4. FG4 - Check Continuity of Octane Adjust Circuit

NO -- Testing complete. EEC system OK.