C1237 Primary Pressure Sensor-Signal: General Description

The pressure sensor installed in the HECU, sense the brake oil pressure to judge driver's brake intention when ESP is operating. If pressure of master cylinder is applied to pressure sensor, the strain of the piezo element is changed and then the resistance of bridge circuit is changed according to changed strain. Therefore this changed resistance changes output voltage of bridge circuit and output voltage changes linearly. The sensor output is a analog signal in proportion to supply voltage, and the HECU recognizes a pressure value according to signal ratio about supply voltage.