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:

    Exhaust Gas Recirculation (EGR) Valve - Mach I
    Removal and Installation 1. Remove the air intake scoop. For additional information, refer to Section. 2. Remove the exhaust gas recirculation (EGR) valve. 1. Disconnect the EGR tube upper fitting. 2. Disconnect the vacuum hose. 3. Remove the tw ...

    Cleaning the windows and wiper blades
    The windows and wiper blades should be cleaned regularly. If the wipers do not wipe properly, substances on the vehicle’s glass or the wiper blades may be the cause. These may include hot wax treatments used by commercial car washes, water repellent coatings ...

    Anti-Theft - Passive Anti-Theft System (PATS) (Description and Operation)
    The passive anti-theft system (PATS) contains the following components: theft indicator encoded ignition key transceiver module instrument cluster powertrain control module (PCM) standard corporate protocol (SCP) communication network The PATS uses rad ...