The HECU supplies operating voltage with pressure sensor & later G sensor in master cylinder. The HECU monitors supply voltage of each sensor for normal ESP control. If supply voltage is out of specified range ESP warning lamps are turned on and 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
? Voltage monitoring
? Faulty HECU
Detect Mode
? Initial Check
? Outside the ABS control cycle
? Inside the ABS control cycle
? Diagnosis mode
? Failure mode
Enable Conditions
? During sensor power ON, If the voltage of sensor power is out of the range of 5±0.5V for 500ms.
? During sensor power OFF, If the voltage of sensor power is out of the range of 0.5±0.1V for 500ms.
? If the YAW or lateral sensor signal pin has a short circuit to a battery.
Fail Safe
? Inhibit the ESP control and allow the ABS/EBD control.
Meanwhile, stop checking the ESP switch failure under the ESP control.
? The ESP warning lamps are activated.