Ford Mustang (1999-2004) Service Manual: 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

Mechanical Electrical
  • Deactivator switch
  • Speed control actuator cable not attached to throttle
  • Speed control actuator cable not fully seated to the engine bracket
  • 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

3. If the fault is not visually evident, verify the symptom and GO to the Symptom chart.

    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 inc ...

    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- ...

    Other materials:

    Air Bag Supplemental Restraint System (SRS) (Diagnosis and Testing)
    Refer to Wiring Diagrams Cell 46 , Air Bag for schematic and connector information. Special Tool(s) Diagnostic Tool, Restraint System 418-F088 (105-R0012) Restraint System Diagnostic Tool Warning WARNING: This tool is for restraint system se ...

    Transmission (Assembly)
    Special Tool(s) Dial Indicator with Bracketry 100-002 (TOOL-4201-C) or Equivalent Gauge, Clutch Housing 308-021 (T75L-4201-A) Extension Housing Seal Replacer 308-227 (T94P-7657-A) Holding Fixture 307-0 ...

    Removal
    1. Remove the A/C compressor (19703). For additional information, refer to Air Conditioning (A/C) Compressor-3.8L or Air Conditioning (A/C) Compressor-4.6L in this section. 2. Remove the bolt. 1. Hold the A/C disc and hub assembly (19D786) with the special ...