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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Terms and Definitions

TERMS AND DEFINITIONS

Trip.
Starting the engine and then driving in such a way that all components and functions embraced by On Board Diagnostic II have been monitored.
Refer to "Driving a trip".

Driving Cycle.
Starting the engine.

Warm-up Cycle.
Starting the engine and then raising engine temperature by at least 22°C (40°F) to at least 71°C (160°F).

Similar Operating Conditions.
^ engine speed ± 375 rpm
^ engine load ± 10%
^ same warm-up status (above or below 71°C [160°F]).