Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD1990RANGER 4WD L4-140 2.3L SOHCREPAIR AND DIAGNOSISCRUISE CONTROLTECHNICAL SERVICE BULLETINSALL TECHNICAL SERVICE BULLETINSSPEED CONTROL - DIAGNOSTIC TIPSOVERVIEW
1990 Ford Ranger 4WD L4-140 2.3L SOHC
Speed Control - Diagnostic Tips: Overview
1990 Ford Ranger 4WD L4-140 2.3L SOHCSECTION Overview
90ford40 SPEED CONTROL - "TRICKS OF THE TRADE"
Article No. 90-25-12
FORD: 1986-91 CROWN VICTORIA, ESCORT, MUSTANG, TAURUS, TEMPO, THUNDERBIRD 1990-92 PROBE
LINCOLN-MERCURY: 1986-87 LYNX
1986-91 CONTINENTAL, COUGAR, GRAND MARQUIS, MARK VII, SABLE, TOPAZ, TOWN CAR
LIGHT TRUCK: 1986-90 BRONCO II
1986-91 AEROSTAR, BRONCO, ECONOLINE, EXPLORER, F-150, F-250, F-350, RANGER 1988-91 F SUPER DUTY
ISSUE: Integrated Vehicle Speed Control (IVSC) was introduced on some 1986 units. The IVSC system uses the EEC IV processor as the control module. Before IVSC a Stand Alone Speed Control System was used on all applications. The Stand Alone Speed Control System uses a separate control amplifier.
ACTION: Refer to the following diagnostic information when servicing speed control concerns. Refer to the Speed Control System Application chart to determine which type of system is used for a specific model.
NOTE: THE DIAGNOSTIC INFORMATION ON THE FOLLOWING PAGES WILL APPLY TO THE STAND ALONE AND INTEGRATED VEHICLE SPEED CONTROL SYSTEMS UNLESS A SPECIFIC VEHICLE TYPE IS REFERENCED.
"TRICKS OF THE TRADE"
Many speed control concerns can be easily resolved by using the following "Tricks of the Trade" diagnostics. If a concern cannot be resolved, refer to the shop manual, Section 37-05 for additional component testing.
Article No. 90-25-12
FORD: 1986-91 CROWN VICTORIA, ESCORT, MUSTANG, TAURUS, TEMPO, THUNDERBIRD 1990-92 PROBE
LINCOLN-MERCURY: 1986-87 LYNX
1986-91 CONTINENTAL, COUGAR, GRAND MARQUIS, MARK VII, SABLE, TOPAZ, TOWN CAR
LIGHT TRUCK: 1986-90 BRONCO II
1986-91 AEROSTAR, BRONCO, ECONOLINE, EXPLORER, F-150, F-250, F-350, RANGER 1988-91 F SUPER DUTY
ISSUE: Integrated Vehicle Speed Control (IVSC) was introduced on some 1986 units. The IVSC system uses the EEC IV processor as the control module. Before IVSC a Stand Alone Speed Control System was used on all applications. The Stand Alone Speed Control System uses a separate control amplifier.
ACTION: Refer to the following diagnostic information when servicing speed control concerns. Refer to the Speed Control System Application chart to determine which type of system is used for a specific model.
NOTE: THE DIAGNOSTIC INFORMATION ON THE FOLLOWING PAGES WILL APPLY TO THE STAND ALONE AND INTEGRATED VEHICLE SPEED CONTROL SYSTEMS UNLESS A SPECIFIC VEHICLE TYPE IS REFERENCED.
"TRICKS OF THE TRADE"
Many speed control concerns can be easily resolved by using the following "Tricks of the Trade" diagnostics. If a concern cannot be resolved, refer to the shop manual, Section 37-05 for additional component testing.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.