Section 10-03: Speed Control System, Electronic
1996 F-150, F-250, F-350, F-Super Duty and Bronco Workshop Manual
DIAGNOSIS AND TESTING

Symptom Chart — Speed Control Diagnostics, Gasoline Engines

NOTE: For 7.3L DI diesel speed control diagnosis, refer to the Powertrain Control/Emissions Diagnosis Manual OBDI or OBDII.

NOTE: Use Rotunda 73 Digital Multimeter 105-R0051 or equivalent to perform electrical pinpoint tests.

SPEED CONTROL DIAGNOSTICS, GASOLINE ENGINES
ConditionPossible SourceAction
  • Speed Control Inoperative
  • Blown fuse.
  • Circuitry.
  • Stoplight switch/bulbs.
  • Speed control actuator switch assembly.
  • Deactivator switch.
  • Speed control servo.
  • Set Speed Fluctuates
  • Programmable Speedometer/Odometer.
 
 
  • Speed control servo.
  • Speed control actuator switch assembly.
  • Circuitry.
  • Loose fit or binding between speed control actuator cable and throttle body.
 
  • Engine.
  • REFER to Powertrain Control/Emissions Diagnosis Manual OBDI or OBDII. SERVICE engine as required.
  • Speed Control Does Not Disengage When Brakes Are Applied
  • Stoplight switch.
  • Speed control servo.
  • Circuitry.
  • Deactivator switch.
  • Binding actuator cable.
  • Speed Control Does Not Disengage When Clutch Is Applied
  • Circuitry.
  • Clutch Switch.
  • COAST Switch Inoperative
  • Speed control actuator switch.
  • Speed control servo.
  • Circuitry.
  • SET/ACCEL Switch Inoperative
  • Speed control actuator switches.
  • Speed control servo.
  • Circuitry.
  • RESUME Switch Inoperative
  • Speed control actuator switch.
  • Speed control servo.
  • Circuitry.
  • OFF Switch Inoperative
  • Speed control actuator switch.
  • Speed control servo.
  • Circuitry.