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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Neutralizing of ECM/ICM





Neutralising Of ECM/ICM
The ECM/ICM can be set to the "neutral" status by a tester.
A valid ignition key is inserted and after ignition on is recorded, the ECM/ICM requests the vehicle specific data from the tester. The communication messages are described at "Neutral Mode". After successfully receiving the data, the ECM/ICM is neutralized.
The ECM/ICM remains locked. Neither the limp home mode nor the "twice ignition on" function, is accepted by the ECM/ICM.
The teaching of keys follows the procedure described for the virgin ECM/ICM. The vehicle specific data have to be unchanged due to the unique programming of the transponder. If data should be changed, new keys with a virgin transponder are requested.