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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Lock-Up System

From sensor input signals, the TCM determines whether to turn the lock-up "ON" or "OFF" and activates lock-up control solenoid valve A and/or B accordingly.





The combination of driving signals to lock-up control solenoid valves A and B is shown in the table.