Manuals through 2025 now available!
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LEMON is the spiritual successor to CHARM, I recommend you try it!
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Barometric Pressure Sensor: Description and Operation
Sensor--normally used in combination with the
MAP sensor--sends a varying voltage to the ECM representing barometric pressure--typically 3.0 to 4.5 volts.
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Voltage increases as altitude increases--barometric pressure decreases.