Anti-Lock Brake System: Description

Anti-Lock Brake System (ABS) prevents wheel lock-up, allowing driver to maintain steering control during heavy braking. ABS consists of an Electronic Control Unit (ECU) with an LED that displays self-diagnostic codes, actuator (electro-hydraulic unit), warning light, wheel speed sensors, wiring and hydraulic lines. See ELECTRICAL COMPONENT LOCATIONS table. See Fig 1.

Actuator (electro-hydraulic unit) consists of a pump motor, accumulator, solenoid valves for each channel, actuator relay, pump motor relay, check valves and reservoirs.

ELECTRICAL COMPONENT LOCATIONS

Component

Location

Actuator

In Engine Compartment

ECU

In Trunk, At Right End Of Rear Shelf

Relays

⁽¹⁾ On Actuator

Wheel Speed Sensor

Front

At Wheel Hub

Rear

At Wheel Hub

⁽¹⁾	Actuator relay is Black; motor relay is Blue or Green.

NOTE: For more brake system information, see BRAKE SYSTEM article in the BRAKES section.

Fig 1: Locating ABS Components

Courtesy of NISSAN MOTOR CO., U.S.A.