The HECU supplies operating voltage to the Steering Angle Senor (12V), Yaw rate & Lateral G sensor (12V), and the G sensor (5V).
The HECU monitors the supply voltage to each sensor.
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 voltage supplied to each sensor is outside the specified range for more than the specified minimum 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. | ||
