Hyundai Sonata LF Quiz
Brake System

Troubleshooting

In this manual: Brake System
General Information — 9Engine Mechanical System — 90Engine Electrical System — 58Emission Control System — 24Engine Control System/Fuel System — 114Drive Shaft and Axle — 15Suspension System — 35Steering — 19Restraints — 50Brake System — 54Body (Interior and Exterior) — 213Body Electrical System — 241Heating, Ventilation, and Air Conditioning — 56DCT (Dual Clutch Transmission) System — 52
18steps
~108min
4/5difficulty
Done 0 of 18

Fault Diagnosis

  1. In principle, ESP and TCS control is prohibited when an ABS failure occurs.
  2. If an ESP or TCS failure occurs, only the malfunctioning system control is prohibited.
  3. However, when the solenoid valve relay must be shut off in case of an ESP failure, refer to the ABS fail-safe.
  4. ABS fail-safe information is identical to the fail-safe for systems where ESP is not installed.
  5. It stores the code as long as backup lamp power is connected. (O)
  6. It stores the code as long as HCU power is on. (X)
  7. The initial check is performed immediately after the HECU is powered on.
  8. The valve relay check is performed immediately after IG2 is turned on.
  9. It performs the check at all times while IG2 power is on.
  10. The initial check is performed in the following cases.
    1. When no fault is detected.
    2. When ABS and ESP are not monitored.
    3. The initial check is not performed after the ECU is powered on.
    4. If the vehicle speed exceeds 8 km/h with the stop lamp switch off.
    5. When the vehicle speed exceeds 24.8 mph (40 km/h).
  11. However, the check continues even when the stop lamp switch is on.
  12. When performing ABS or ESP control before the initial check, stop the initial check and wait for the HECU power input again.
  13. The judgment fails in the following cases.
    1. When the power supply is normal.
    2. From the moment the vehicle speed reaches 8 km/h after the HECU is powered on.
  14. Turn off the system, perform the following steps, and wait for the HECU power to turn off.
  15. Turn off the valve relay.
  16. Do not perform any ABS/TCS/ESP functions until normal operating condition is restored.
  17. The ABS warning lamp illuminates when an ABS malfunction occurs.
  18. The ESP function/warning lamp illuminates when an ESP malfunction occurs.
Fail Code Memory, Fault Check, Fail-Safe Action, Warning Lamp Illuminated. When the power supply voltage and valve relay voltage are out of normal range, the input/output-related fault evaluation is not performed.

Test yourself

A quick Hyundai Sonata LF quiz: every answer comes with an explanation and a link to the manual page.