DTC C1604 Ecu Hardware Error: DTC Detecting Condition

DETECTING CONDITION AND POSSIBLE CAUSE

Item		Detecting Condition	Possible cause
Case 1	DTC Strategy	EEPROM Check	Faulty HECU
	Monitoring Period	Once per loop during EEPROM write access
	Enable Conditions	The MCU checks the specified programming time with every write access to the EEPROM. The EEPROM device has to set a logical signal if a write procedure is completed. A failure is detected if this logical signals fails.
	Fail Safe	The ABS/TCS/ESC functions are deactivated. The ABS/TCS/ESC warning lamps are activated.
Case 2	DTC Strategy	Monitoring the Valve Solenoids
	Monitoring Period	once every 200 to 300 ms
	Enable Conditions	A failure is detected if the valve relay is switched off and the reference voltage of solenoid valve > 1.5V continuously for 56ms. A failure is detected if the voltage drop at the activated low-side driver exceeds 2.0V or the voltage drop at one or more deactivated low-side drivers does not reach 2,0V continuously for 56ms.
	Fail Safe	The ABS/EBD/TCS/ESC functions are deactivated. The ABS/EBD/TCS/ESC warning lamps are activated.
Case 3	DTC Strategy	Temperature Sensor Monitoring
	Monitoring Period	Cyclic every 1sec
	Enable Conditions	A temperature sensor failure is detected if the failure event has occurred 5 times.
	Fail Safe	The temperature value is set to -30 °C. The all warning lamps are not activated.
Case 4	DTC Strategy	Long-Time Monitoring of the ESC Function
	Monitoring Period	once per loop during active ESC
	Enable Conditions	A failure is detected if the ESC function is active for more than 15s without a direction change of the calculated additional yaw torque.
	Fail Safe	The TCS/ESC functions are deactivated. The TCS/ESC warning lamps are activated.