The Bendix Anti-lock 4 Brake System has been designed with the following self diagnostic capabilities. The self diagnostic ABS start up cycle begins when the ignition switch is turned to the on position. At this time an electrical check is completed on the ABS components such as Wheel Speed Sensor Continuity and System and other Relay continuity. During this check the amber anti-lock light is on for approximately 1-to-2 seconds.
Further Anti-lock Brake System functional testing is accomplished once the vehicle is set in motion, knows as drive-off.
- The solenoid valves and the pump/motor are activated briefly to verity function.
- The voltage output from each of the wheel speed sensors is verified to be within the correct operating range. If a vehicle is not set in motion within 3 minutes from the time the ignition switch is turned to the on position. The solenoid valve test is bypassed but the pump/motor is activated briefly to verify that it is operating correctly.