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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Air Conditioning Clutch Relay

Air Conditioning Clutch Relay

This monitor checks to confirm that the A/C control relay is responding to a request from the ECM to switch it on or off. When the entry conditions have been met the ECM compares the state of the A/C compressor clutch relay to the commanded state. If they do not agree then a timer is started. If at the end of the period the commanded and actual relay states do not agree then the DTC is flagged.