Ranger 4WD V6-3.0L VIN U (1997)
Electronic Brake Control Module: Description and Operation
Four Wheel Anti-Lock Brake System (4WABS)
MONITORS SYSTEM
It is an on-board diagnostic, non-repairable unit consisting of two microprocessors and the necessary circuitry for their operation. These
microprocessors are programmed identically. The ABS control module monitors system operation during normal driving as well as during
anti-lock braking. The ABS control module monitors the electromechanical components of the system. Malfunction of the ABS will cause the
ABS control module to shut off or inhibit the system. However, normal power assisted braking remains. Malfunctions are indicated by the ABS
warning light in the instrument cluster.
Preventing Wheel Lockup
The 4-Wheel ABS (4WABS) prevents wheel lockup by automatically modulating the brake pressure during an emergency stop. By not locking the
wheels, the driver can improve steering control during hard braking and stop the vehicle in the shortest possible distance under most conditions.
Brake Force
The 4WABS controls both front and rear brakes separately. The brake pedal force required to engage the 4WABS function may vary with the road
surface conditions. A dry surface requires a higher force, while a slippery surface requires much less force.
Normal ABS Events
During the 4WABS operation, the driver will sense a pulsation in the brake pedal, accompanied by a slight up and down movement in the pedal
height. In addition, a mechanical noise from the engine compartment may be heard. The pedal effort and pedal feel during normal braking are
similar to that of a conventional power.
