Civic L4-1590cc 1.6L SOHC (VTEC) (1992)
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Atmospheric Pressure (PA) Sensor: Description and Operation
The Atmospheric Pressure (PA) sensor, which is built into the ECU, is a silicon diaphragm strain gauge type of pressure sensor. This signal is
used by the ECU as a reference signal, and compares it to the signal from the MAP sensor to calculate the engine load condition.