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Home >> Kia >> 2012 >> Optima Hybrid >> Repair and Diagnosis >> Brakes >> Mechanical - Hydraulic >> Active Hydraulic Booster (AHB) System Diagnosis - HEV >> DTC C1237: Primary Pressure Sensor-Signal >> General Information >> DTC Detecting Condition

General Information: DTC Detecting Condition

Item Detecting Condition Possible cause
DTC Strategy
  • Voltage Monitoring
  1. Faulty pressure sensor
  2. Air in the hydraulic system
  3. Brake fluid leakage
  4. Foreign material in brake fluid
  5. Faulty pump (or motor)
  6. Faulty Valve
  7. Exceedingly Frequent Braking
  8. Empty Brake Fluid Reservoir
Case 1 Enable Conditions
  • In case of Pressure sensor offset that calculated during driving is over 15bar
  • ECU compare the deviation pressure signal [HPA, BCP, ESC MCP]. If the change of pressure signal is discordant, ECU detect failure.
Fail Safe
  • EBD warning lamp is activated and buzzer is not activated.
  • "Check Brake!" message is displayed on LCD.
Case 2 Enable Conditions
  • In the case of HPA pressure is under specific pressure
  • If HPA charging continues for more than 35sec, ECU detects failure.
  • In case of HPA pressure stick during HPA charing, ECU detects failure
Fail Safe
  • EBD warning lamp and buzzer are activated.
  • "Check Brake!" message is displayed on LCD.