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Home >> Mercury >> 1992 >> Topaz L4-140 2.3L HSC >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> EGR Valve Position Sensor >> Description and Operation
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EGR Valve Position Sensor: Description and Operation

EGR valve position sensor:





The EGR Valve Position (EVP) sensor, mounted on top of the EGR valve, is a linear potentiometer that monitors the position of the EGR valve.
The operating output values for the EVP sensor are approximately 0.8 volts (EGR valve closed) to approximately 4.5 volts (EGR valve fully open). The Electronic Control Assembly (ECA) receives the output value from the EVP sensor and converts it into EGR valve position. This information is used to optimize the air/fuel ratio, ignition timing, and EGR flow for the best possible performance under all operating conditions.
The EVP sensor will also set a fault code when it sends a signal to the ECA that is out of the normal operating range.
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