Ford 2003 Mustang Workshop Manual page 647

SECTION 206-09A: Anti-Lock Control — Rear
DIAGNOSIS AND TESTING
Anti-Lock Control
Refer to Wiring Diagrams Cell
Special Tool(s)
Worldwide Diagnostic System
(WDS)
418-F224,
New Generation STAR (NGS)
Tester
418-F052, or equivalent scan
tool
73 Digital Multimeter or
equivalent
105-R0051
Principles of Operation
The anti-lock brake control module receives wheel speed readings from each anti-lock brake sensor
and processes this information to determine if an ABS event is necessary. The anti-lock brake sensor
electrically senses each tooth of the anti-lock brake sensor indicators as it passes through the anti-lock
brake sensor's magnetic field.
The anti-lock brake control module continuously monitors and compares the rotational speed of each
wheel, and when it detects an impending wheel lock, modulates hydraulic brake pressure to the
appropriate brake caliper. This is accomplished by the anti-lock brake control module triggering the
hydraulic control unit (HCU) to open and close the appropriate solenoid valves. Once the affected
wheel returns to normal speed, the anti-lock brake control module returns the solenoid valves to their
normal position, and normal (base) braking resumes.
The anti-lock brake control module is self-monitoring. When the ignition switch is turned to the RUN
position, the anti-lock brake control module will do a preliminary electrical check, and at approximately
12 km/h (8 mph) the pump motor is turned on for approximately one half-second. Any malfunction of
the ABS will cause the ABS to shut off and the yellow ABS warning indicator to illuminate, however,
normal power assisted braking remains.
The ABS control module has the ability to store multiple DTCs in memory.
Inspection and Verification
1. Verify the customer concern by operating the system.
2. Visually inspect for obvious signs of mechanical and electrical damage.
42 , Anti-Lock Brake for schematic and connector information.
2003 Mustang Workshop Manual