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Home >> Lincoln >> 2011 >> MKS Base, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1883 (Anti-Lock Brake System - Vehicle Dynamic Systems) >> Diagnosis And Testing >> Anti-Lock Control >> Pinpoint Tests >> Pinpoint Test L: Poor Vehicle Tracking During Anti-lock Function >> Normal Operation

Normal Operation

WARNING: This page is about a different car, the 2011 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.

The ABS module uses input from several different sensors (wheel speed sensors, Brake Pedal Position (BPP) switch, Restraints Control Module (RCM), etc.) to determine if an ABS event is necessary. If an ABS event is necessary, the ABS module will command 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.

The operating voltage required to supply the ABS module, hydraulic pump and isolation valves is in a range between 10 and 16 volts. Fused battery voltage is supplied to the ABS module by Battery Junction Box (BJB) fuse 9 (40A) along circuit SBB09 (RD) and by BJB fuse 12 (20A) along circuit SBB12 (GN/RD). Fused ignition voltage is supplied to the ABS module by Smart Junction Box (SJB) fuse 34 (5A) along circuit CBP34 (VT/BN). Ground is provided along circuit GD120 (BK/GN).

This pinpoint test is intended to diagnose the following: 

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