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 CONTROLCRUISE CONTROL SERVOTESTING AND INSPECTION
1990 Ford Ranger 4WD L4-140 2.3L SOHC
Cruise Control Servo: Testing and Inspection
1990 Ford Ranger 4WD L4-140 2.3L SOHCSECTION Testing and Inspection
1. Disconnect 8 way connector from amplifier.
2. On 1988 models, connect an ohmmeter between orange wire w/yellow hash and gray wire w/black hash at the connector. A resistance of 40-125 ohms should be obtained.
3. On 1989-92 models, connect an ohmmeter between orange wire w/yellow hash and gray wire w/black hash at the connector. A resistance of 40-70 ohms should be obtained.
4. On 1988 models, connect an ohmmeter between the leads of orange wire w/yellow hash and white wire w/pink hash and check for a reading of 60-90 ohms.
5. On 1989-92 models, connect an ohmmeter between the leads of orange wire w/yellow hash and white wire w/pink hash and check for a reading of 100-150 ohms.
6. On all models, disconnect servo from amplifier, then start engine. Connect orange wire w/yellow hash of servo to battery positive post, then connect white wire w/pink hash to ground and momentarily touch gray wire w/black hash to ground. Servo throttle actuator should pull in and engine RPM should increase. Throttle should hold in position or slowly release. When white wire w/pink hash is removed from ground, servo should release.
7. Replace servo if servo fails to function as described. Amplifier may need replacement if orange wire w/yellow hash is shorted to either white-pink hash lead or gray-black hash lead.
2. On 1988 models, connect an ohmmeter between orange wire w/yellow hash and gray wire w/black hash at the connector. A resistance of 40-125 ohms should be obtained.
3. On 1989-92 models, connect an ohmmeter between orange wire w/yellow hash and gray wire w/black hash at the connector. A resistance of 40-70 ohms should be obtained.
4. On 1988 models, connect an ohmmeter between the leads of orange wire w/yellow hash and white wire w/pink hash and check for a reading of 60-90 ohms.
5. On 1989-92 models, connect an ohmmeter between the leads of orange wire w/yellow hash and white wire w/pink hash and check for a reading of 100-150 ohms.
6. On all models, disconnect servo from amplifier, then start engine. Connect orange wire w/yellow hash of servo to battery positive post, then connect white wire w/pink hash to ground and momentarily touch gray wire w/black hash to ground. Servo throttle actuator should pull in and engine RPM should increase. Throttle should hold in position or slowly release. When white wire w/pink hash is removed from ground, servo should release.
7. Replace servo if servo fails to function as described. Amplifier may need replacement if orange wire w/yellow hash is shorted to either white-pink hash lead or gray-black hash lead.
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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.