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 TCS/ESP warning lamps are turned on and TCS/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 TCS/ESP control and allow the ABS/EBD control. Meanwhile, stop checking the TCS/ESP switch failure under the TCS/ESP control. ● The TCS/ESP warning lamps are activated. |
