General Information

C1604 ECU (Brake System) Hardware error

General Information

Component Location





General Description

The HECU is composed of a ECU (Electronic Control Unit) and a HCU (Hydraulic Control Unit), so the HECU hardware includes all solenoid valves inside the unit as well as the ECU.

DTC Description

The HECU monitors the operation of the IC components such as memory, register, A/D converter and so on.
The HECU 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





Diagnostic Circuit Diagram