Operation CHARM: Car repair manuals for everyone.
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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Barometric Pressure (BARO)

The scan tool displays a range of 10-105 kPa and 0.00-5.00 volts. The barometric pressure reading is determined from the Manifold Absolute Pressure (MAP) sensor signal. The PCM monitors the MAP signal during key up or Wide-open Throttle (WOT) conditions. The barometric pressure compensates for altitude differences.