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
Faulty HECU
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)
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.
ESP/DBC functions are inhibited, ABS/EBD function is allowed and the ESP/DBC warning lamps are activated.