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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Accessories and Optional Equipment: Testing and Inspection

The SKREEM has been programmed to transmit and monitor many different coded messages as well as CAN Bus messages. This monitoring is called On-Board Diagnostics. Certain criteria must be met for a DTC to be entered into SKREEM memory. The criteria may be a range of; input voltage, CAN Bus message or coded messages to the SKREEM. If all the criteria for monitoring a circuit or function are met and a fault is detected, a DTC will be stored in the SKREEM memory and the START ERROR indicator will be turned on in the instrument cluster.