TIAGO

BRAKES 16 6.9 ABS COMPONENTS 6.9.1 ABS 9 ELECTRONIC CONTROL UNIT / HYDRAULIC CONTROL UNIT (ECU / HCU): General This is an Electro-hydraulic device for reducing, holding & restoring pressure to one or more wheel brake, independent of the brake pedal effort applied by the driver. It consists of: i. An Electronic Control Unit (ECU) and ii. A Hydraulic Control Unit (HCU). (i) ECU: Solid state electronic device containing computer functions, sensor signal processing circuits, output device drives for the various ABS valves & components and Failure Detection Logic. The ECU is integrated in a single package with the Hydraulic Control Unit (HCU). It has 2 Micro controllers, which utilize the same program for independent data processing and monitoring functions. One of the Micro controllers has an EEPROM to retain memory data in case battery supply is interrupted. The EEPROM is a non- volatile data storage device employed to store error codes, which can be read out for diagnosis. When an error is encountered ABS switches itself off and triggers the ABS warning lamp. An independent module controls the solenoid valve relay and return pump motor.