The HECU supplies battery power to all soleonid valves with a valve relay which is controlled by the Electronic Control UNIT(ECU).
The valve relay and all solenoid valves are installed inside the HECU ( Hydraulic and Electronic Control Unit ).
The ESP ECU monitors the voltage from the valve relay.
When the valve relay is switched to ON, the HECU will set this code if the solenoid voltage is below a specific range for a period of time.
When the valve relay is switched to OFF, the HECU sets this code if the solenoid voltage is over a specific range for a period of time.
Item | Detecting Condition | Possible cause | |
DTC Strategy |
•
Voltage Monitoring | 1. Open or short of power supply circuit 2. Faulty HECU | |
Case1 (Open) | Enable Conditions |
•
If the valve relay is switched on and the reference voltage of valve relay < 5±0.5V continuously for 56ms, the failure is detected. | |
Case2 (Short or leakage) | Enable Conditions |
•
If the valve relay is switched off and voltage of valve relay > 6±0.5V or < 2.5±0.5V continuously for 56ms, the failure is detected. | |
Fail Safe |
•
The ABS/EBD/ESP/DBC functions are inhibited.
•
The ABS/EBD/ESP/DBC warning lamps are activated. | ||
