If abnormal vehicle speed change rate or speed difference between each wheel is abnormally large during driving vehicle with steady speed, HECU sets DTC C1210.
Item | Detecting Condition | Possible cause | |
DTC Strategy |
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Current Monitoring | 1. Defected Tone Wheel 2. Defected Rear-RH Wheel Speed Sensor 3. Defected HECU | |
Threshold Value | Case 1 (Speed jump) |
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This monitoring is performed when vehicle speed reaches over 2 km/h(Approx. 1mph) and detects speed change that difficult to occur physically 1) Wheel acceleration of ± 100g occurs over 56 times on one wheel and over 5 times on more than 2 wheels 2) Wheel acceleration of 70g occurs over 126 times on one wheel and over 20 times on more than two wheels 3) Wheel velocity does not recover to vehicle speed for 140 msec after wheel deceleration of -100g is detected 4) Speed jump counter resets every 30 minutes ※ 100g : Approx. 99.2 m/s2 , 70g : Approx. 67.5 m/s2 | |
Case 2 (Wrong exciter / Missing teeth) |
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Front-LH wheel speed sensor velocity is 40% of fastest wheel velocity for over 2 minutes when fastest wheel velocity is at between over 20 km/h(Approx. 12 mph) and below 40 km/h (Approx.25 mph)
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Front-LH wheel speed sensor velocity is 60% of fastest wheel velocity for over 2 minutes when fastest wheel velocity is over 40 km/h (Approx.25 mph)
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Abnormal wheel speed sensor signal is detected for more than 6 times, caused by defected Tone wheel teeth during vehicle speed at 10 km/h (Approx. 6 mph) ~ 80 km/h (Approx. 50 mph) upon non-ABS control condition | ||
Case 3 (Wheel Sensor type mis-installation) |
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If the signal is detected as a smart wheel sensor signal 50 times consecutively on the wheel that is set as active wheel sensor
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If the signal is detected as an invalid signal 50 times consecutively on the wheel that is set as smart wheel sensor
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This monitoring is only performed when vehicle speed is at between 10 km/h (Approx. 6 mph) and 30 km/h (Approx. 19 mph) and once normal condition is detected, monitoring is not performed | ||
Fail Safe |
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In case of failure on one wheel - ABS inhibited (ABS Only) - ABS/CBC/TCS/ESC(ESP)/HAC/VSM/AVH inhibited (ESC[ESP] Only)
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In case of failure on more than two wheels - EBD/ABS inhibited (ABS Only) - EBD/ABS/CBC/TCS/ESC(ESP)/HAC/VSM/AVH inhibited (ESC[ESP] Only) | ||
Warning Indicator Lamp Status |
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In case of failure on one wheel - ABS/ESC(ESP) Warning Indicator Lamp "ON"
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In case of failure on more than two wheels - EBD/ABS/ESC(ESP) Warning Indicator Lamp "ON" | ||
Clear Condition |
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Ignition "OFF" and then "ON" and Vehicle speed over 10 km/h (Approx. 6 mph) | ||
