General Information

Component Location





General Description

The ABS HECU is composed of a ECU (Electronic Control Unit) and an HCU (Hydraulic Control Unit), so the HECU hardware includes all solenoid valves inside the unit as well as the ECU.
Solenoid valves are switched to ON, OFF by HECU when the ABS is activated. Solenoid valves function is to increase, decrease or maintain the hydraulic pressure supplied to a wheel cylinder.

DTC Description

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 drive voltage is detected.
For example, the HECU sets the DTC if an unexpected high drive voltage is detected when the valve relay is switched to OFF. (or unexpected low voltage is detected when the solenoid valve drive TR is switched to ON)

DTC Detecting Condition





Diagnostic Circuit Diagram