The HECU supplies operating voltage with Steering angle senor (12V), Yaw rate & lateral G sensor (12V), G sensor (5V).
The HECU monitors supply voltage of each sensor for normal ESP control.
If supply voltage is out of specified range ABS/ESP warning lamps are turned on and ABS/ESP controls are inhibited.
A failure is detected if the external sensor supply voltage is out of the specified range for more than the specified min. fault duration.
Item | Detecting Condition | Possible cause | |
DTC Strategy |
•
Battery Voltage Monitoring | 1. Faulty HECU 2. Poor connection in power supply circuit to sensor | |
Case1 (5V sensor supply) | Enable Conditions |
•
During sensor power ON, If the voltage of sensor power is out of the specified range for 0.1s.
•
During sensor power OFF, If the voltage of sensor power is out of the specified range for 0.1s. | |
Fail Safe |
•
ABS/ESP/DBC functions are inhibited, EBD function is allowed and the ABS/ESP/DBC warning lamps are activated | ||
Case2 (12V sensor supply) | Enable Conditions |
•
During sensor power ON, If the voltage of sensor power is out of the specified range for 0.1ms.
•
During sensor power OFF, If the voltage of sensor power is out of the specified range for 56ms. | |
Fail Safe |
•
ESP/DBC functions are inhibited, ABS/EBD function is allowed and the ESP/DBC warning lamps are activated | ||
