Ford 2003 Mustang Workshop Manual page 678

SECTION 206-09B: Anti-Lock Control — Traction Control
DIAGNOSIS AND TESTING
Anti-Lock Control —Traction 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 brake pressure to the appropriate
brake caliper. This is accomplished by 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. Also during all
phases of operation the anti-lock brake control module (after the vehicle is in motion) checks for
correct operation of the anti-lock brake sensors. Any malfunction of the ABS will cause the ABS to shut
off and ABS warning indicator to illuminate; normal power assisted braking, however, remains.
The ABS control module has the ability to store multiple DTCs in memory.
The traction control system controls wheelspin by modulating the engine torque by communicating to
the powertrain control module (PCM) and by applying, then releasing, the appropriate brake to restore
traction when one or both drive wheels lose traction and begin to spin during acceleration.
The traction control system can be disabled by depressing the traction control switch. The traction
control system will reset and return to normal traction assist when the ignition switch is cycled or when
the traction control switch is depressed again.
42 , Anti-Lock Brake System for schematic and connector information.
2003 Mustang Workshop Manual