ABS CM FUNCTION [YF (2.0L Zetec), AJ (3.0L Duratec)]

• The ABS CM is mounted on the ABS HU.

• It is an on-board diagnostic, non-repairable unit consisting of two microprocessors and the necessary circuitry for their operation. The ABS CM monitors system operation during normal driving as well as during anti-lock braking.

• ABS CM operation is as follows:

- Under normal driving conditions, the microprocessor produces short test pulses to the solenoid valves that check the electrical system without any mechanical reaction.

- Impending wheel lock conditions trigger signals from the ABS CM that open and close the appropriate solenoid valves. This results in moderate pulsations in the brake pedal.

- The ABS CM used in 4WD application includes a G-sensor.

• During normal braking, the brake pedal feel is identical to a standard brake system.

• Most faults that occur in the ABS will be stored as a diagnostic trouble code (DTC) in the ABS CM non-volatile memory. DTCs can be retried by following the on-board diagnostic procedures.