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Home >> Hyundai >> 2020 >> Sonata SEL >> Repair and Diagnosis >> Brakes >> Anti-Lock Brakes >> Abs Diagnosis (Except HEV) (1 Of 2) >> DTC C1201-02: Wheel Speed Sensor Front-LH Range/Performance/Intermittent >> DTC Information And Inspection >> DTC Detecting Condition

DTC Information And Inspection: DTC Detecting Condition

Trouble Shooting Condition Possible Cause
Main Action
  • Monitor the wheel speed sensor signal
  1. Improper installation of wheel speed sensor (poor air gap)
  2. Failure to engage with the wheel speed sensor knuckle mounting bolt
  3. Deformation/contamination of tone wheel and poor performance (new magnet specification)
  4. Excessive mechanical force intrusion
  5. Abnormal Rotor and wheel bearing
  6. Faulty Wheel speed sensor
  7. Open or short circuit of Wheel speed sensor circuit
  8. Faulty ESP (ESC)
Case 1 Threshold value
  • When wheel sensor speed pulse is not detected while the vehicle speed is above 40 km/h (24.9 MPH) for more than 300 milliseconds.
Diagnosis time
  • 300 milliseconds
Case 2 Threshold value
  • A failure is detected when the ECU recognizes wheel speed change of ±100g from one wheel.
    • When a brake pedal is stepped on, and wheel speed is rapidly changed for more than 20 seconds.
    • When a brake pedal is not stepped on, and wheel speed is rapidly changed for more than 5 seconds.
    • In case that more than three wheel speed change are rapidly for more than 1 second.
Diagnosis time
  • 20 seconds/5 seconds/1 second
MIL
  • Only one wheel failure

    : ABS/ESP (ESC) warning lamps are activated. EBD/EPB warning lamp is not activated.

  • Two or more wheels failure

    : ABS/EBD/ESP (ESC)/EPB warning lamps are activated.
Reset condition
  • After ignition switch turned OFF and back ON, when all wheel speed is normal after driving more than 12 km/h (7.45 MPH).
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