Ford 2003 Mustang Workshop Manual page 3011

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SECTION 310-03: Speed Control

DIAGNOSIS AND TESTING

Speed Control

Refer to Wiring Diagrams Cell

Special Tool(s)

Worldwide Diagnostic System

New Generation STAR (NGS)

418-F052, or equivalent

diagnostic tool

73 Digital Multimeter or

Breakout Box, EEC-V Control

System 418-049, or equivalent

Principles of Operation

The speed control system is designed to maintain vehicle speed above 48 km/h (30 mph). After the

ON switch is depressed, depressing the SET/ACCEL switch will activate the speed control servo. To

increase a set speed, either depress and hold for continuous acceleration, or momentarily tap the

SET/ACCEL switch for 1.6 km/h (1 mph) acceleration increments. To decrease a set speed, depress

and hold the COAST switch until the target speed is reached, or momentarily tap the COAST switch

for 1.6 km/h (1 mph) deceleration increments. When the speed control system has been disabled by

tapping the brake pedal, the RESUME switch can be depressed and the vehicle will return to the

original set speed if the vehicle is traveling over 48 km/h (30 mph) and the OFF switch has not been

NOTE: The deactivator switch is provided as an additional safety feature. Normally, when the brake

pedal is depressed, an electrical signal from the brake lamp circuit to the speed control servo will

deactivate the system. Under increased brake pedal effort, the deactivator switch will open and

remove power to the speed control servo, releasing the throttle independent of the speed control

NOTE: The air bag sliding contract provides the electrical interface between the steering column wiring

and the speed control actuator switches in the steering wheel.

The inputs to the speed control servo are the:

vehicle speed signal.

, Speed Control for schematic and connector information.

2003 Mustang Workshop Manual

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