HEXA

ELECTRONIC STABILITY PROGRAM (ESP)

19.3 COMPONENTS

NOTE

For all components except ESP ECU, Steering angle sensor, Yaw rate sensor and ESP warning lamp refer

ABS section.

A. ESP ECU AND HYDRAULIC UNIT

The ESP ECU and hydraulic control unit consist of a hydraulic modulator with integrated pressure sensor

and electronic control unit. In addition to the individual wheel valves present for the ABS, the ESP hydraulic

modulator has a pair of internal switching valves on the primary and secondary brake circuits from the

master cylinder. These are used when brake pressure has to be increased at individual wheels.

The HCU of ABS vehicles (ABS only) and ESP vehicles cannot be interchanged. ESP hydraulic unit have

additional 4 valves for Brake pressure increase.