| DTC Strategy |
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- Improper installation of wheel speed sensor
- Abnormal Rotor and wheel bearing
- Faulty Wheel speed sensor (FL)
- Faulty HECU
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| Case1 |
Monitoring Period |
- The monitoring is active from 10 km/h to 60km/h and if no ABS-control is active at a front wheel and a rear wheel.
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| Enable Conditions |
- Every time, if a gap in the wheel speed sensor signal occurs cyclically with one wheel rotation, a fault counter is increased by one. If the fault counter exceeds its limit of 10, a wheel specific fault is stored in the EEPROM.
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| Case2 |
Monitoring Period |
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| Enable Conditions |
- If following interference and signal disturbance is detected, a failure is set after 10s.
- non-plausible high frequency received.
- non-plausible high wheel acceleration.
- non-plausible high wheel jerk.
- non-plausible delta T and edges at low speed.
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| Fail Safe |
- Sensor failure outside of the ABS control cycle
- 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.
- 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.
- 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
- 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, the ABS/ESC functions are inhibited. The ABS/ESC warning lamps are activated and the EBD warning lamp is not activated.
- 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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