Normal Operation

WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, and 2011 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

The operating voltage required to supply the ABS module, hydraulic pump and isolation valves is in a range between 10 and 16 volts. The ABS module uses input from several different sensors (wheel speed sensors, Brake Pedal Position (BPP) switch, sensor cluster, etc.) to determine if an ABS event is necessary. If an ABS event is necessary, the ABS module commands the hydraulic pump motor on and command the Hydraulic Control Unit (HCU) to actuate the appropriate solenoids. During an ABS event, the front and rear end of the vehicle should track true to the direction of travel along the vehicle centerline unless driver input dictates otherwise, there is an internal issue with the HCU or an issue with the base brake system (caliper, tubes, etc.) that allows one or more wheels to lock up.

Fused battery voltage is supplied to the ABS module from Battery Junction Box (BJB) fuse 10 (30A) along circuit SBB10 (YE/RD) and fuse 8 (40A) along circuit SBB08 (VT/RD). Fused ignition voltage is supplied to the ABS module from Smart Junction Box (SJB) fuse 42 (10A) along CBP42 (GN) and ground is provided to the module along circuit GD123 (BK/GY).

This pinpoint test is intended to diagnose the following:

Base brake system
HCU