General Information

Electronic Stability Control
C1237 Primary Pressure Sensor-Signal - General Information

Component Location





General Description

The pressure sensor, installed in the HECU, sense the brake oil pressure to judge driver's brake intention when ESC is operating.
If pressure of master cyclinder is applied to pressure sensor, the strain of the piezo element is changed and then the resistance of brige circuit is chanded according to changed strain.
Therefore this changed resistance changes output voltage of brige 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.

DTC Description

The failure is detected if the pressure sensor signal noise is out of normal range, or the pressure sensor signal is changed abnormally.
In spite of no brake switch signal, master cylinder pressure exceeds 20bar when brake switch is normal.

DTC Detecting Condition





Diagnostic Circuit Diagram