Civic Sedan L4-1493cc 1.5L SOHC (D15B2) TBI (1989)
Manifold Pressure/Vacuum Sensor: Description and Operation
Fig. 32 MAP Sensor And Voltage Output Characteristics
The Manifold Absolute Pressure Sensor is a silicon diaphragm strain gauge type of sensor. It converts a pressure differential to a voltage signal
which is then sent to the ECU as an input. At idle with a manifold pressure of 500 mmHg (20 in.Hg) the sensor output is approx. 1.0-1.25 volts, at
wide open throttle manifold pressure of 0 mmHg (0 in.Hg) the output is approx. 2.75-3.0 volts.