Malibu V6-191 3.1L VIN M SFI (1997)
Electronic Brake Control Module: Description and Operation
DESCRIPTION
The controlling element of ABS VI is a microprocessor based Electronic Brake Control Module, or EBCM. Inputs to the system include four
wheel speed sensors, the brake switch, the brake fluid level switch, ignition switch, and unswitched battery voltage. Outputs include three
bi-directional motor controls, two solenoid controls and the Electronic Brake Control Relay. A serial data line is used for service diagnostic tools
(scan tool), assembly plant testing and control of indicators in the Instrument Cluster.
OPERATION
The EBCM monitors the speed of each wheel. If any wheel begins to approach lockup, the EBCM controls the motors and solenoids to reduce
brake pressure to the wheel approaching lockup. Once the wheel regains traction, brake pressure is increased until the wheel again begins to
approach lockup. This cycle repeats until either the vehicle comes to a stop, the brake is released, or no wheels approach lockup. Additionally, the
EBCM monitors itself, each input and each output for proper operation. If a system malfunction is detected, the EBCM will store a DTC in
nonvolatile memory (DTCs will not disappear if the battery is disconnected).
