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Home >> Ford >> 2004 >> Mustang Mach 1, Automatic >> Repair and Diagnosis >> Accessories & Equipment >> Cruise Control Systems >> Speed Control System >> Diagnosis And Testing >> Speed Control >> Symptom Chart
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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 SYSTEM WIRING DIAGRAMS for connector numbers stated in the Pinpoint Test.
SYMPTOM CHART

Condition Possible Sources Action
  • The speed control is inoperative
  • Central junction box (CJB) fuse 17 (15A), 33 (15A).
  • Battery junction box (BJB) fuse HORN (20A).
  • Circuitry.
  • Deactivator switch.
  • Clutch pedal position (CPP) switch.
  • Speed control actuator switch.
  • Speed control servo.
  • Powertrain control module (PCM).
  • The set speed fluctuates
  • Circuitry.
  • Speed control servo.
  • Powertrain control module (PCM).
  • Engine.
  • The speed control does not disengage when the brakes are applied
  • Central junction box (CJB) fuse 33 (15A).
  • Circuitry.
  • Brake pedal position (BPP) switch.
  • Speed control servo.
  • The speed control does not disengage when the clutch is applied
  • Clutch pedal position (CPP) switch.
  • Speed control servo.
  • The speed control switch is inoperative - COAST
  • Speed control actuator switch.
  • Speed control servo.
  • The speed control switch is inoperative-SET/ACCEL
  • Speed control actuator switch.
  • Speed control servo.
  • The speed control switch is inoperative-RESUME
  • Speed control actuator switch.
  • Speed control servo.
  • The speed control switch is inoperative-OFF
  • Speed control actuator switch.