DTC No | Condition | Possible Cause |
C1604 | - When the MCU can’t erase or write a data of the EEPROM. - If the master/slave processor detects abnormal operation in RAM, status register, interrupt, timer, A/D converter and cycle time. | - EEPROM Failure of HECU - MCU failure of HECU |
The system stops. the ABS, TCS(ESP) and the EBD functions are inhibited. The ABS, TCS(ESP) and the EBD warning lamps are ON. The valve relay and all solenoids are OFF.
CHECK CIRCUIT FOR CONTINUITY BETWEEN THE HECU AND BODY GROUND.
Measure the resistance between terminals 8(-), 24(-) of the HECU connector and the body ground.
Is the resistance below 1Ω?
▶ Check and readjust the installing of the body groud.
▶ After cleaning the DTC and driving the vehicle at 40 km/h speed or more, if the ABS warning lamp is ON and the same DTC shows again, replace the HECU and recheck.
