System Diagnostics: Notes
CAUTION:
For safety reasons it is recommended that vehicle not be driven with test equipment connected. Exception: for testing of wheel speeds provided test regulations are met.
The EBCM performs system self-diagnostics and can detect and often isolate system malfunctions. When it detects a malfunction, EBCM sets a DTC that represents a malfunction, turns ON ABS and/or EBD indicators in most instances, and may disable ABS and/or EBD functions as necessary for duration of ignition cycle.
Once each ignition cycle, EBCM performs an automatic test when vehicle speed is greater than 6 kph and brake pedal is not actuated or when vehicle speed is greater than15 kph and brake pedal is actuated. In course of this test, system cycles each solenoid valve solenoid and pump motor, along with necessary relays, to check component operation. If EBCM detects any malfunctions, it will set a DTC as described above.
NOTE:
The Electronic Brake Control Module (EBCM) turns valve relay off when a diagnostic trouble code (DTC) is set. The scan tool will indicate valve relay is off when it is used to monitor data list. This is normal and should not be considered a malfunction.