Component Tests and General Diagnostics

Most intermittent faults are caused by faulty electrical connections or wiring. When an intermittent fault is encountered, inspect ABS circuits for the following:

1. Poor mating of electrical connector halves, or electrical terminals not fully seated in the connector body.
2. Improperly formed or damaged terminals. Inspect all electrical connector terminal condition.
3. Poor wire to terminal connection.
^ If a visual inspection does not find the cause of the problem, operate the vehicle to attempt to duplicate the condition. The following conditions may result in intermittent illumination of the red brake lamp and/or the amber anti-lock brake warning lamp. All other failures will cause the lamp(s) to remain on until the ignition switch is placed in Off position.
4. Low system voltage. If low system voltage is detected by the CAB, the CAB will turn On the amber anti-lock brake warning lamp until system voltage is restored.
5. Low brake fluid. A low brake fluid condition will cause the red warning lamp to illuminate until the fluid sensor indicates a normal fluid level.
6. Low accumulator pressure. Low accumulator pressure will cause both the red and amber warning lamps to illuminate until normal accumulator pressure is restored.
7. Any condition that results in intermittent power to the CAB or hydraulic assembly may cause the red and/or amber warning lamps to come on.