C1604

DTC C1604 ECU HARDWARE ERROR

COMPONENT LOCATION

Refer to DTC C1235. C1235

GENERAL DESCRIPTION

The HECU is composed of a 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 a pump. The HCU function which is composed of an accumulator, return pump, solenoid valve is to increase, decrease or maintain the hydraulic pressure supplied to a wheel cylinder by operating return pump according to HECU control signal while ABS control.

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 written, or when the master/slave processor detects abnormal operation in RAM, Status Register, Interrupt, Timer, A/D converter or cycle time.

DTC DETECTING CONDITION:

COMPONENT INSPECTION

Refer to DTC C1101. C1101

VERIFICATION OF VEHICLE REPAIR

Refer to DTC C1101. C1101