Component Location
General Description
The pressure sensor, installed in the HECU, converts the brake pressure to judge the driver's brake intention when the ESP program is operated. When pressure is applied to the sensor, the resistance of the sensor's strain gauge changes. The change in resistence changes the voltage output from the sensor.
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
Item | Detecting Condition | Possible cause |
DTC Strategy | Voltage Monitoring
| External noise. Faulty pressure sensor |
Enable Conditions | If input signal is noisy, Which the gradient of the sensor signal is larger than predefined value for specific times, ECU detect the failure. Outside an ABS/ESP control, And after normal operation of BLS, If the pressure sensor signal is higher than 20bar and BLS is low for 3sec, ECU detect the failure.
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Fail Safe | Inhibit the ESP/DBC control and allow the ABS/EBD control. The ESP/DBC warning lamp is activated.
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Diagnostic Circuit Diagram