S15/T15 4WD Jimmy V6-262 4.3L VIN Z (1992)
Manifold Pressure/Vacuum Sensor: Testing and Inspection
Manifold Absolute Pressure Output Check
Circuit Description:
The Manifold Absolute Pressure (MAP) sensor measures the changes in the intake manifold pressure which result from engine load (intake
manifold vacuum) and rpm changes; and converts these into a voltage output. The control module sends a 5 volt reference voltage to the MAP
sensor. As the manifold pressure changes, the output voltage of the sensor also changes. By monitoring the sensor output voltage, the control
module knows the manifold pressure. At lower pressure output voltage will be about 1 to 2 volts. While at higher pressure or at Wide Open
Throttle (WOT) output voltage will be about 4 to 4.8 volts.The MAP sensor is also used, under certain conditions, to measure barometric pressure,
