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DTC Information: DTC Detecting Condition

DTC DETECTING CONDITIONS AND POSSIBLE CAUSES

Item Detecting Condition Possible cause
DTC Strategy
  • Signal monitoring
  1. Improper installation of wheel speed sensor
  2. Abnormal Rotor and wheel bearing
  3. Faulty Wheel speed sensor
Enable Conditions Case1 (wrong exciter)
  • Max. wheel velocity exceeds 20km/h and the wheel velocity is 40% of max. wheel velocity. if this condition is lasted for 2 minutes.
  • Max. wheel velocity exceeds 40km/h and the wheel velocity is 60% of max. wheel velocity. if this condition is lasted for 2 minutes.
Case2 (Speed jump)
  • Controller counts the number of the wheel acceleration of 100g [(25km/h) for 7ms]. When the numbers at one wheel exceed 56 times, or When the numbers at more two wheels exceed 5 times, controller recognize the failure
  • Controller counts the number of the wheel acceleration of 70g [(17.5km/h) for 7ms]. When the numbers at one wheel exceed 126 times, or When the numbers at more two wheels exceed 20 times, controller recognize the failure
  • Controller counts the number of the wheel deceleration of -100g [(-25km/h) for 7ms]. When the numbers at each wheel exceed 56 times, controller recognize the failure
  • The wheel deceleration of -100g[(-25km/h) for 7ms] causes the controller to start monitoring this failure and to compare the wheel velocity with the vehicle velocity from next cycle. When its difference of -100g is continued for more than 140msec, controller recognize the failure
  • In case that any sensor failure at other wheel was already detected, When the numbers of 100g at each wheel exceed 5 times, or When the numbers of 70g at each wheel exceed 20 times, controller recognize the failure
    • The counter of speed jump is cleared every 30min.
    • This monitoring is performed for the period that the velocity of each wheel exceeds 2km/h.
Fail Safe
  1. Only one wheel failure: Inhibit the ABS/ESP/DBC control, allow the EBD control. The ABS/ESP/DBC warning lamps are activated, the EBD warning lamp is not activated
  2. More than two wheels failure: The ABS/EBD/ESP/DBC functions are inhibited. The ABS/EBD/ESP/DBC warning lamps are activated
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