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
This signal is sent from the A/C amplifier. When the A/C clutch is energized the A/C amplifier will pull a signal line low that is in series with the A/C vacuum switching valve
solenoid. The ECM uses this signal to adjust
air/fuel mixture for the lean condition that the A/C VSV solenoid creates. The vehicles engine speed will be increased slightly to prevent stalling.