Component Tests and General Diagnostics

The Bendix Antilock 4 Braking System has self diagnosis capability. The self diagnosis cycle begins when the ignition switch is in the ON position. An electrical check is completed on the Antilock Brake System (ABS) components such as wheel speed sensors continuity, system continuity and other relay continuity. During this check the Antilock Light will be on for approximately one to two seconds.

Once the vehicle is set into motion the solenoid valves and pump motor are activated briefly to verify proper operation. The voltage output of the speed sensors is verified to be within the correct operating range.

If the vehicle is not set into motion within three minutes from the time the ignition is set to the ON position. The solenoid test is bypassed but the pump motor will be activated briefly to verify proper operation.

This Antilock Brake System (ABS) has a self-diagnosis connector located under the fuse panel access cover. The access cover is located on the lower section of the instrument panel to the left of the steering column. The ABS diagnostic connector is a blue 6-way connector which can be connected to a DRB II diagnostic readout box.

Any fault codes present in the CAB memory will be displayed on the DRB II. There are 16 fault codes which may be stored and displayed. These fault codes will remain in the CAB memory even after the ignition is turned off.

Some fault codes detected by the CAB are latching, and ABS is disabled until the ignition switch is reset, even if the original fault has disappeared.

Other faults are non-latching, any warning lights that are illuminated are only illuminated as long as the fault exists. As soon as the fault goes away, the light(s) are extinguished, although a fault code will be set in most cases.