Where is the Speed Control Amplifier located?

Behind the center of the instrument panel, near the radio (connector face on page 150-18).

Where is the Speed Control Servo located?

At the LH rear of the engine compartment, near the brake fluid reservoir; the Vacuum Dump Valve is mounted on the speed control servo.

What is the minimum speed for the cruise control to operate?

The engine must be running and vehicle speed must be greater than 30 mph. RESUME also will not work below 30 mph or after OFF has been pressed.

What turns the speed control system off?

Pressing OFF (grounds the LB/BK wire), depressing the brake pedal (power through the R/LG wire), turning the Ignition Switch off, or depressing the clutch pedal on manual-transaxle vehicles.

What does the Vacuum Dump Valve do?

It operates when the brake pedal is depressed and acts as a backup device to release the servo.

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1990 Ford Speed Control 31-4 – Cruise Control Component Locations & Operation

Speed Control 31-4 component location and circuit operation page for Ford cruise control system

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Ford speed control service page 31-4 listing component locations (clutch interlock switch, EEC module, servo amplifier, dump valve, speed sensor) and describing how the cruise control circuit works above 30 mph.

AI caption October 2015 · Photo 1749 of 1799

This scanned page (Section 31-4, Speed Control) is from a Ford electrical/vacuum troubleshooting manual and covers the speed control (cruise control) system. The top of the page is a component location table listing each speed control component, its physical location on the vehicle, the component location view page/zone, and the connector face page. Components include the Clutch Interlock Switch and Jumper (on clutch pedal support), EEC Module (lower LH safety wall), Fuse Panel, Hazard Flasher, Speed Control Amplifier (behind center of instrument panel near radio), Speed Control Servo (LH rear of engine compartment near brake fluid reservoir), Stoplamp Switch, TECA module, Vacuum Dump Valve, and Vehicle Speed Sensor. The lower portion, 'How the Circuit Works,' explains system operation: the amplifier controls vacuum to the servo motor, the system requires engine running and speed above 30 mph, and it describes SET/ACCEL, COAST, OFF, and RESUME functions, including wire colors LB/BK (ground for OFF) and R/LG (brake power). It notes the Vacuum Dump Valve as a backup servo release and the clutch switch cutout on manual-transaxle vehicles. A footnote directs readers to page 152-1 for connector/splice locations and to section 37-01 of the shop manual for diagnostics.

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Frequently asked questions

Where is the Speed Control Amplifier located?: Behind the center of the instrument panel, near the radio (connector face on page 150-18).
Where is the Speed Control Servo located?: At the LH rear of the engine compartment, near the brake fluid reservoir; the Vacuum Dump Valve is mounted on the speed control servo.
What is the minimum speed for the cruise control to operate?: The engine must be running and vehicle speed must be greater than 30 mph. RESUME also will not work below 30 mph or after OFF has been pressed.
What turns the speed control system off?: Pressing OFF (grounds the LB/BK wire), depressing the brake pedal (power through the R/LG wire), turning the Ignition Switch off, or depressing the clutch pedal on manual-transaxle vehicles.
What does the Vacuum Dump Valve do?: It operates when the brake pedal is depressed and acts as a backup device to release the servo.