DTC C1604 Ecu Hardware Error: DTC Detecting Condition

DTC DETECTING CONDITION CHART

Item		Detecting Condition	Possible cause
DTC strategy		Internal monitoring	Inoperative HECU
Case 1	Monitoring Period	Continuous
Case 1	Enable Conditions	If Internal control unit failures of the master/slave processor or peripheral integrated circuits is detected.
Case 2	Monitoring Period	Directly after ignition on, during reading of EEPROM-values
Case 2	Enable Conditions	Failure is set if checksum not correct or PSW-EEPROM-Handler reported unknown failure during EEPROM-value reading. If EEPROM reading sequence take longer then 3 s, a failure is set.
Fail Safe		The ABS/EBD/ESC functions are inhibited. The ABS/EBD/ESC warning lamps are activated.