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)
Or, hide this message:
temporarily or
permanently
TWC Protection
Scan tool displays ACTIVE or INACTIVE. ACTIVE displayed indicates that the
PCM has detected conditions appropriate to operate in Three-Way Catalytic Converter
(TWC) Protection mode. This is determined based on the engine load and the engine coolant temperature. While in TWC Protection, the PCM will decrease the air-to-fuel to a value that depends on mass air flow. Higher mass air flow equals a lower air-to-fuel ratio.