Manifold Pressure/Vacuum Sensor: Testing and Inspection

INSPECTION




Manifold Absolute Pressure Sensor (MAPS) is speed-density type sensor and is installed on the surge tank. This MAPS senses absolute pressure in surge tank and transfers this analog signal proportional to the pressure to the PCM. The PCM calculates the intake air quantity and engine speed based on this signal. This MAPS consists of piezo-electric element and hybrid IC that amplifies the element output signal. The element is silicon diaphragm type and adapts pressure sensitive variable resistor effect of semi-conductor. 100% vacuum and the manifold pressure applies to both sides of it respectively. That is, this sensor outputs the silicon variation proportional to pressure change by voltage.
SPECIFICATION






CIRCUIT DIAGRAM





COMPONENT INSPECTION
1. Connect a scan tool to the Diagnosis Link Connector (DLC).
2. Check MAPS output voltage at idle and IG ON.