Electronic Brake Control Module: Description and Operation

Component Location View:

PURPOSE
The Electronic Brake/Traction Control Module (EBCM/EBTCM) is a computer, mounted in the engine compartment, which monitors the speed of each wheel, brake pressure modulator valve's electrical status and brake switch status.

PRIMARY FUNCTIONS
The EBCM/EBTCM's primary functions are to detect wheel slipping (with traction control) tendencies, control the brake system while in the antilock/traction mode, and monitor the system for proper electrical operation. The EBCM/EBTCM also controls displaying diagnostic trouble codes while in diagnostic mode. The EBCM/EBTCM continuously checks each wheel speed to determine when any wheel is beginning to slip.

OPERATION
When a wheel slipping tendency is detected, the EBCM/EBTCM commands appropriate BPMV solenoid valve positions to modulate brake fluid pressure in the corresponding hydraulic circuits. This prevents wheel slip and provides optimum braking/traction. The EBCM/EBTCM continues to control pressure in the individual hydraulic circuits until a slipping tendency is no longer present. Additionally, when traction control mode is entered, the EBTCM requests that the PCM bring engine torque to a specific range to control wheel slip. The EBCM/EBTCM electrically monitors the system for proper operations. When the EBCM/EBTCM detects an error, it disables the antilock and/or traction system and turns ON the ANTILOCK indicator and/or the TRACTION OFF indicator in the IPC.