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
A/C Signal: Description and Operation
On models equipped with air conditioning, the
A/C signal informs the
Engine Control Module (
ECM) that the A/C switch is turned "ON" and the A/C pressure cycling switch is closed. With this input, the ECM adjusts engine
idle speed as needed to maintain a smooth idle.