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

Overdrive Cancel Switch Test

On vehicles equipped with Overdrive Cancel Switch (OCS), the switch must be cycled after the ID code has been displayed. This tests the ability of the EEC-IV system to detect a change of state in the Overdrive Cancel Switch.