DTC Description

If MCU can't erase or write a data of the EEPROM or master/slave processor detects abnormal operation in RAM, ROM, Interrupt, Timer, A/D Converter and Cycle time, HECU sets DTC 1604. DTC Detecting Condition

Item	Detecting Condition	Possible cause
DTC Strategy	Signal Monitoring	Defective HECU
Threshold Value	MCU can't erase or write a data of the EEPROM Master/Slave processor detects abnormal operation in RAM, ROM, Interrupt, Timer, A/D converter, Cycle time
Warning Indicator Lamp Status	EBD/ABS/ESC (ESP) Warning Indicator Lamp "ON"
Clear Condition	Ignition "OFF" and then "ON"