General Information

Component Location





General Description

The HECU consists of an ECU (Electronic Control Unit) and a HCU (Hydraulic Control Unit).
The HCU portion of the assembly contains a pump motor, solenoid valves, and accumulator.
Increase and decrease of hydraulic pressure is operated by electronic motor, according to a measured signal by wheel speed sensor.
The function of HCU 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 is active.
The ECU monitors various sensor and switch inputs.
These inputs are used to make decisions regarding HCU component operation.

DTC Description

This trouble code is set when the solenoid valves or operating circuit are malfunctioning as well as the trouble of HECU.The HECU monitors the operation of the valves by checking the drive circuit of the solenoid valves, and then sets this code when the unexpected drain voltage is detected, and also sets this code when the HECU module itself is out of order. For example, when the EEPROM data read by master processor is different from the data sent before or when the master/slave processor detects abnormal operation in RAM, Status Register, Interrupt, Timer, A/D converter, cycle time, the HECU sets this code.

DTC Detecting Condition