DTC C1604: HECU Hardware Failure: Condition
WARNING: This page is about a different car, the 2002 Hyundai XG350. However, it is still accessible from the selected car via links, so may be relevant.
EEPROM failure is recognized if when after master processor writes a pre-determined data to EEPROM the data is read and compared. DTC sets if data differs. ECU failure is recognized and DTC sets, when master/slave processor detects abnormal operation in RAM, status register, interrupter, A/D convertor or cycle time. Possible causes are:
- ABS hydraulic unit malfunction.
- Wiring harness or harness connector malfunction.
- Hydraulic and Electronic Control Unit (HECU) malfunction.