C1604

DTC C1604 ECU HARDWARE ERROR
COMPONENT LOCATION
Refer to DTC C1235. C1235

GENERAL DESCRIPTION
The HECU is composed of an ECU (Electronic Control Unit ) and a HCU( Hydraulic Control Unit), HCU is composed of a source of hydraulic pressure and modulator valve block. Increase and decrease of hydraulic pressure is operated by electronic motor, According to a detected signal by wheel speed sensor, The hydraulic pressure which is needed for control is supplied by pump. The HCU' function which is composed of a accumulator, return pump, solenoid valve is to increase, decrease or maintain the hydraulic pressure supplied to a brake caliper by operating return pump according to HECU control signal while ABS control is active.

DTC DESCRIPTION
The HECU monitors the operation of the IC components such as memory, register, A/D converter and so on. The ECU sets this code when the EEPROM data read by the master processor is different than prior data writed, or when the master/slave processor detects abnormal operation in RAM, Status Register, Interrupt, Timer, A/D converter or cycle time.

DTC DETECTING CONDITION





TERMINAL AND CONNECTOR INSPECTION
Refer to DTC C1260. C1260

COMPONENT INSPECTION
Refer to DTC C1235. C1235

VERIFICATION OF VEHICLE REPAIR
Refer to DTC C1101. C1101