Self-Diagnostics

SYSTEM MALFUNCTIONS
The Electronic Brake/Traction Control Module (EBCM/EBTCM) performs system self-diagnosis, and can detect and often isolate system malfunctions. When a malfunction is detected the EBCM/EBTCM sets a Diagnostic Trouble Code (DTC). The DTC represents the malfunction, turns "ON" the "ABS" and/or "TRACTION OFF" indicator lamps (in almost all instances), and may disable the ABS and/or TCS function as nessary for the duration of the ignition cycle.

INITIALIZATION SEQUENCE
The EBCM/EBTCM performs the Initialization test each time the vehicle is started and the EBCM/EBTCM does not see a brake switch input. The Initialization sequence cycles each valve solenoid and the pump motor for 1.5 seconds (as well as the necessary relays) to check component operation. If any error is detected, the EBCM/EBTCM will set a DTC as described above. The Initialization sequence may be heard and felt while it is taking place, and is considered part of normal operation.