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 CONTROLTESTING AND INSPECTIONCOMPONENT TESTS AND GENERAL DIAGNOSTICS
1990 Ford Ranger 4WD L4-140 2.3L SOHC
Component Tests and General Diagnostics
1990 Ford Ranger 4WD L4-140 2.3L SOHCSECTION Component Tests and General Diagnostics
1. Block front wheels securely. Using a suitable lifting device, raise and support rear of vehicle. Never attempt to use the vehicle bumper jack for a test of this type.
2. Start engine and shift transmission to Drive.
3. Turn on the speed control system. If at any time during the following steps the system should appear to go out of control and over speed, be prepared to turn speed control system off at once with the Off switch or ignition switch.
4. Accelerate and hold at 35 mph.
5. Press and release Set button. Hold foot pressure very lightly on accelerator pedal.
6. Press Off button. The engine should decelerate to idle. Stop rear wheel with service brakes.
7. Press On button, accelerate and hold speed at 35 mph.
8. Press and hold Set-Acc button. Slowly remove foot from accelerator. The engine RPM should gradually increase.
9. When the speed reaches 50 mph, release Set-Acc button. The vehicle should maintain 50 mph for a short time before surging begins.
10. Press Coast button and hold. The engine should idle. Slow rear wheels to 35 mph.
11. Release Coast button. Speed should set in and surging should soon start.
12. Apply brake pedal. The system should shutoff, engine should decelerate to idle and wheels should stop turning.
13. Set speed at 50 mph. Decelerate to 35 mph and maintain 35 mph with the accelerator. Depress and release Resume button. The speed should return to 50 mph.
2. Start engine and shift transmission to Drive.
3. Turn on the speed control system. If at any time during the following steps the system should appear to go out of control and over speed, be prepared to turn speed control system off at once with the Off switch or ignition switch.
4. Accelerate and hold at 35 mph.
5. Press and release Set button. Hold foot pressure very lightly on accelerator pedal.
6. Press Off button. The engine should decelerate to idle. Stop rear wheel with service brakes.
7. Press On button, accelerate and hold speed at 35 mph.
8. Press and hold Set-Acc button. Slowly remove foot from accelerator. The engine RPM should gradually increase.
9. When the speed reaches 50 mph, release Set-Acc button. The vehicle should maintain 50 mph for a short time before surging begins.
10. Press Coast button and hold. The engine should idle. Slow rear wheels to 35 mph.
11. Release Coast button. Speed should set in and surging should soon start.
12. Apply brake pedal. The system should shutoff, engine should decelerate to idle and wheels should stop turning.
13. Set speed at 50 mph. Decelerate to 35 mph and maintain 35 mph with the accelerator. Depress and release Resume button. The speed should return to 50 mph.
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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.