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Home >> Kia >> 2008 >> Rio Base, Automatic >> Repair and Diagnosis (Single Page) >> Brakes >> Anti-Lock Brakes >> Abs (Anti-Lock Brake System) >> Diagnostic Trouble Codes >> DTC C1202 Wheel Speed Sensor Front-LH Invalid/No Signal; DTC C1205 Wheel Speed Sensor Front-RH Invalid/No Signal; DTC C1208 Wheel Speed Sensor Rear-LH Invalid/No Signal; DTC C1211 Wheel Speed Sensor Rear-RH Invalid/No Signal >> DTC Detecting Condition

DTC C1202 Wheel Speed Sensor Front-LH Invalid/No Signal; DTC C1205 Wheel Speed Sensor Front-RH Invalid/No Signal; DTC C1208 Wheel Speed Sensor Rear-LH Invalid/No Signal; DTC C1211 Wheel Speed Sensor Rear-RH Invalid/No Signal: DTC Detecting Condition

DETECTING CONDITION AND POSSIBLE CAUSE REFERENCE

Item Detecting Condition Possible cause
DTC Strategy
  • Signal monitoring
  • Improper installation of wheel speed sensor
  • Abnormal Rotor and wheel bearing
  • Faulty Wheel speed sensor
  • Faulty HECU
Case 1 (Large Air-gap) Detect Mode
  • Outside the ABS control cycle
  • Diagnosis mode
  • Failure mode
Enable Conditions
  • When the minimum wheel velocity is 1.24 mph and the velocity of other wheels exceed 6.21 mph with the acceleration of < 0.4g, the controller start comparing the velocity of other wheels except the min. wheel, if their difference below 2.49 mph is continued for 140 msec, Otherwise, if their difference beyond 2.49 mph or > 0.4 g is continued for 2 minutes.
  • In < 0.4 g, when the velocity of more two wheels is 1.24 mph and the max. wheel velocity exceeds 6.21 mph, the condition is continued for 20 sec. Otherwise, In > 0.4 g, the condition is 2 minutes.
  • After velocity of 4 wheel exceeds 6.21 mph, when velocity of 1 wheel or 2 wheel is 1.24 mph and difference of other 2 wheel velocity is less than 2.49 mph under that those velocity is more than 6.21 mph, if that conditions are continued for 12 seconds.
    • - This monitoring is performed for the period that the minimum velocity rises from 1.24 mph to 6.21 mph.
Case 2 (long term ABS mode) Detect Mode
  • Inside the ABS control cycle
Enable Conditions
  • During the ABS control cycle, if the wheel velocity of 1.24 mph is lasted for more than 12 sec.
  • If the ABS control cycle is continued for more than 36 sec.
Fail Safe
  • Sensor failure outside of the ABS control cycle
    1. Only one wheel failure: Only the ABS functions are inhibited. The ABS warning lamps are activated and the EBD warning lamp is not activated
    2. More than two wheels failure: System down. The ABS/EBD functions are inhibited. The valve relay and all solenoids are prevented from being switched on. The ABS/EBD warning lamps are activated.
  • Sensor failure inside the ABS control cycle
    1. One front wheel failure: Inhibit the ABS control of the failed-wheel and maintain the ABS control of normal wheel. After the ABS control, the ABS functions are inhibited. The ABS warning lamps are activated and the EBD warning lamp is not activated.
    2. Failure at one rear wheel: ABS control of both front wheels are inhibited and the pressure of both rear wheels are decreased. After the controller completes the ABS control, the ABS functions are inhibited. The ABS warning lamps are activated and the EBD warning lamp is not activated.
    3. More than 2 wheels failure: System down. The ABS/EBD functions are inhibited. The valve relay and all solenoids are prevented from being switched on. The ABS/EBD warning lamps are activated.
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