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
If it fails: lemon-manuals.org.ua

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Warm Up Cycle

A Warm-up cycle consists of an engine start-up and vehicle operation such that the coolant temperature has risen greater than 4°C (40°F) from the start-up temperature and reached a minimum engine coolant temperature of 160°F (71°C). If this condition is not met during the ignition cycle, the diagnostic may not run.