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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Loop Status

The scan tool displays Open, or Closed. This parameter indicates the state of the fuel control system. A CLOSED display indicates that the PCM is using the signals from the heated oxygen sensors to control the fuel system.