Ford 2003 Mustang Workshop Manual page 3012

speed control actuator switches.
brake pedal position (BPP) switch.
clutch pedal position (CPP) switch.
deactivator switch.
The output of the speed control servo is the:
speed control actuator cable controlling the throttle position.
Inspection and Verification
NOTE: If any concerns are noted with the speedometer, stoplamps, or horn, address those concerns
by referring to their associated sections before continuing speed control diagnosis.
1. Verify the customer concern by operating the speed control system.
2. Visually inspect for obvious signs of mechanical and electrical damage.
Visual Inspection Chart
Deactivator switch
Speed control actuator cable not attached to throttle
Speed control actuator cable not fully seated to the
engine bracket
3. If the fault is not visually evident, verify the symptom and GO to the Symptom chart.
Symptom Chart
NOTE: New speed control diagnostic software is available in Version 12 or higher for the diagnostic
tool. When using this software, it is necessary to use Next Generation Speed Control Adapter 007-
00586 with the diagnostic tool.
NOTE: Refer to the Wiring Diagrams for connector numbers stated in the Pinpoint Test.
Symptom Chart
Condition
The speed control is
Mechanical
Possible Sources
Central junction
Electrical
Central junction box (CJB)
Fuse:
15 (15A)
33 (15A)
35 (15A)
Battery junction box (BJB)
fuse:
HORN (20A)
Wiring harness
Loose or corroded
connections
Speed control actuator
switches
Action
Go To Pinpoint Test A .