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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temporarily or
permanently
Barometric Pressure Sensor: Description and Operation
PURPOSE AND OPERATION The Barometric Pressure Sensor measures atmospheric pressure and converts the measurement into a Voltage signal which is sent to the ECM.
The ECM uses the Voltage signal to adjust the air-fuel ratio and ignition timing for the altitude at which the vehicle is running, thus improving driveability at high altitude.
