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
Manifold Pressure/Vacuum Sensor: Description and Operation
This sensor is a dual purpose sensor providing both barometric pressure (BARO) and manifold pressure (
MAP) readings. With the key on before the engine is started the ECM uses this information for altitude and weather compensation. Once the engine is started the ECM uses the MAP information to determine engine load and is used for spark advance and fuel calculations.