Diagnosis & Testing: Notes

The EBCM performs system self-diagnostics and can detect and often isolate a system malfunction. When a malfunction is detected, EBCM sets a DTC and illuminate the ABS/TCS warning light and may also disable the ABS/TCS functions as necessary for the duration of the ignition cycle.

The EBCM performs an auto test once per ignition cycle when ignition switch is turned to RUN position. The auto test cycles each solenoid valve and pump motor (and all necessary relays) in order to check the component operation. If an error is detected, the EBCM will set a DTC. The AUTO TEST may be felt and heard while it is in progress.