General Information

Active Hydraulic Booster

C1237 Primary Pressure Sensor-Signal - General Information

Component Location





General Description

There are three pressure sensors in HPU (Hydraulic Power Unit). They each measure high pressure accumulator pressure, booster pressure, pedal simulator pressure. AHB ECU (Electronic Control Unit) uses these measured values to monitor AHB operatoring status and control AHB.
After replacing AHB ECU, pressure sensor calibration is essential.

DTC Description

The failure is detected if the pressure sensor offset is out of normal range, or the pressure sensor signal is changed abnormally or HPA pressure is stick during HPA charing or abnormal charging continues.

DTC Detecting Condition





Diagnostic Circuit Diagram