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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Operation

OPERATION
When the exhaust gas temperature is cold, the sensor resistance is high, the Engine Control Module (ECM) will sense the resistance and sense the exhaust temperature as cold.
When the exhaust gas temperature is high, the sensor resistance is low, the ECM will sense the resistance and sense the exhaust temperature as high.