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

Barometric Pressure Sensor: Description and Operation

Barometric Pressure (BP) Sensor:

The Barometric Pressure (BP) sensor is a frequency generating device produces varying signals depending on the amount of barometric (atmospheric) pressure. The Engine Control Assembly (ECA) monitors the frequency emitted from the BP sensor. The ECA calculates input from the BP sensor to optimize the air/fuel ratio, idle speed, purge flow and A/C cutoff.