Manifold Absolute Pressure Sensor Terminal Identification


Voltage Constant Control

Regulated 5 volt reference


Pressure Intake Manifold

Signal voltage representing manifold pressure


Earth Ground

Sensor ground return path

The sensor and ECU are wired as shown in the diagram. As manifold pressure increases (approaches atmospheric pressure) there is a proportionate increase in PIM signal voltage. This analog signal characteristic is depicted in the accompanying graph.

TO check sensor calibration, signal voltage should be checked against the standards shown on the graph, and a voltage drop check should be performed over the entire operating range of the sensor.

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