ABS with AdvanceTrac® Stability Enhancement System: Notes

The ABS with AdvanceTrac® system consists of the following components:

• ABS module - attached to the Hydraulic Control Unit (HCU), but can be serviced separately from the HCU.
• Front wheel speed sensors - one sensor is located in each front wheel knuckle. The sensors are serviced separately from the knuckle.
• Front wheel speed sensor tone rings - one tone ring is located on the outer CV joint of each halfshaft and is serviced with the halfshaft.
• HCU - which contains several valves (inlet, outlet, isolation and dump) and the hydraulic pump motor. On hybrid vehicles, the HCU is mounted in the rear, RH side of the engine compartment near the RH shock tower. On all other vehicles, the HCU is mounted in the front, RH side of the engine compartment near the degas bottle.
• Rear wheel speed sensors - one sensor is located in each rear wheel knuckle, the sensors are serviced separately from the knuckle).
• Rear wheel speed sensor tone rings - on All-Wheel Drive (AWD) vehicles, one tone ring is located on the outer CV joint of each halfshaft and is serviced with the halfshaft. On Front Wheel Drive (FWD) vehicles, one tone ring is located on each rear wheel hub and is serviced with the wheel hub.
• Stability control sensors - located inside the Restraints Control Module (RCM) and consist of the following sensors: yaw rate, lateral accelerometer and longitudinal accelerometer. The sensors are integral to the RCM and cannot be serviced separately.
• Steering wheel rotation sensor - only on vehicles equipped with a 3.5L engine, the rotation sensor is located on the RH side of the clockspring and is serviced separately from the clockspring assembly. On all other vehicles, steering wheel rotation position information is sent from the Power Steering Control Module (PSCM) over the High Speed Controller Area Network (HS-CAN).
• Steering wheel rotation sensor ring - only on vehicles equipped with a 3.5L engine, the rotation sensor ring is located on the clockspring and is serviced with the clockspring assembly.
• Traction control switch - on Fusion and Milan vehicles, the switch is part of a 2 or 3 switch package (depending on vehicle options) located in the instrument panel center finish panel and is serviced separately from the finish panel. On MKZ vehicles, the switch is part of the Front Controls Interface Module (FCIM) and is serviced with the module.
• Vacuum sensor (3.0L AWD, 3.5L and hybrid) - located on the front of the brake booster in the 12 o'clock position on non-hybrid vehicles, and in the 10 o'clock position on hybrid vehicles. The sensor can be serviced separately from the booster, refer to POWER BRAKE ACTUATION -- BRAKE BOOSTER article.