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HOMESERVICE MANUALSHYUNDAI2009SONATA SE, 3.3 FREPAIR AND DIAGNOSIS (SINGLE PAGE)BRAKESANTI-LOCK BRAKESESC (ELECTRONIC STABILITY CONTROL) SYSTEMTROUBLESHOOTING FOR DTCC1202 WHEEL SPEED SENSOR FRONT-LH INVALID/NO SIGNALDTC DETECTING CONDITION
2009 Hyundai Sonata SE, 3.3 F

C1202 Wheel Speed Sensor Front-LH Invalid/no Signal: DTC Detecting Condition

2009 Hyundai Sonata SE, 3.3 FSECTION DTC Detecting Condition
DTC DETECTING CONDITION AND POSSIBLE CAUSE

Item Detecting Condition Possible cause
DTC Strategy
  • Signal monitoring
  • Improper installation of wheel speed sensor
  • Abnormal Rotor and wheel bearing
  • Faulty Wheel speed sensor (FL)
  • Faulty HECU
Case 1 Monitoring Period
  • Continuous (only no under voltage is not detected)
Enable Conditions
  • If one (or two) wheel are at 2.75km/h and the other wheels are above 12 km/h for longer than 1s.
  • During driving, when the vehicle accelerates 18km/h after a particular wheel speed gets to 2.75km/h and stays there. At that time, If one (or two) wheel are at 2.75km/h.
    • This monitoring is performed at the following condition
    1. At the time the vehicle is accelerated to 12km/h
    2. Once after energizing the system.
    3. If the vehicle was stationary for approx. 2s.
  • If one (or two) wheels are under 5km/h and the two fastest wheels have a velocity above 12km/h for more than 20s.
Case2 Monitoring Period
  • Continuous (If vehicle speed > 12 m/s)
    • but this monitoring is disabled in the following event
    1. aquaplaning.
    2. interference.
    3. supply voltage below 7.1 or above 18 Volts.
Enable Conditions
  • No wheel speed signals within 10 ms to 20 ms at a vehicle speed > 12 m/s (43,2 km/h).
    • If the dynamic sensor monitor responses, the failures will be stored into failure memory immediately after a waiting period of 60ms.
    • If occurs low voltage active sensors during the waiting period of 60 ms no failure is stored in the EEPROM.
Case 3 Monitoring Period
  • Main Monitoring
    • The main monitor needs additional information of the ESP-sensors and is active for a velocity > 20 km/h and no under voltage is detected.
  • Backup Monitoring
    • Continuous
Enable Conditions
  • Main Monitoring
    1. If the maximum difference of wheel speeds related to maximum wheel speed exceeds 5%.
    2. detection filter time :
      • the above conditions apply for 20s for 1 defective wheel speed sensor.
      • the above conditions apply for 40s for 2 defective wheel speed sensor.
  • Backup Monitoring
    1. If the deviation between the fastest and the slowest wheel is below 6% related to the fastest wheel when the velocity is higher than 100 km/h.
    2. When the velocity is below 100 km/h, if the deviation is an absolute value of 6km/h.
    3. detection filter time : normally 20s
      • In case of a detected curve, the threshold is increased with an additional value of 4 km/h.
Case 4 Monitoring Period
  • Continuous
Enable Conditions
  • The pulse width of wheel speed sensor is below 2ms when vehicle speed is > 0km/h and < 20 km/h.
Fail Safe
  • Sensor failure outside of the ABS control cycle
    1. Only one wheel failure : Only the ABS/ESC functions are inhibited. The ABS/ESC warning lamps are activated and the EBD warning lamp is not activated.
    2. Two wheels failure : Only the ABS/ESC functions are inhibited. The ABS/ESC warning lamps are activated and the EBD warning lamp is not activated.
    3. More than 3 wheels failure :System down. The ABS/EBD/ESC functions are inhibited. The ABS/EBD/ESC warning lamps are activated.
  • Sensor failure inside the ABS control cycle
    1. One front wheel failure : Inhibit the ABS/ESC control. Pressure is increased on a front wheel, Pressure is decreased on a rear wheel. After the ABS/ESC control, t-he ABS/ESC functions are inhibited. The ABS/ESC warning lamps are activated and the EBD warning lamp is not activated.
    2. Two wheels failure : Inhibit the ABS/ESC control. Pressure is increased on a front wheel, Pressure is decreased on a rear wheel. After the ABS/ESC control, the ABS/ESC functions are inhibited. The ABS/ESC warning lamps are activated and the EBD warning lamp is not activated.
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