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 MANUALSFORD1991RANGER 4WD V6-245 4.0LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSSERVICE AND REPAIR
1991 Ford Ranger 4WD V6-245 4.0L
Computers and Control Systems: Service and Repair
1991 Ford Ranger 4WD V6-245 4.0LSECTION Service and Repair
The processor stores data about vehicle operating conditions and uses this information to compensate for component tolerances. When an emission related component is replaced, Keep Alive Memory (KAM) should be cleared to erase the data stored by the processor from the original component.
1. With the ignition switch OFF, disconnect the negative battery cable for a minimum of five minutes, then reconnect the cable.
2. Operate the vehicle for a minimum of ten miles to allow the Engine Control Assembly (ECA) to relearn values for optimum driveability and performance.
NOTE: Distance varies with vehicle application.
1. With the ignition switch OFF, disconnect the negative battery cable for a minimum of five minutes, then reconnect the cable.
2. Operate the vehicle for a minimum of ten miles to allow the Engine Control Assembly (ECA) to relearn values for optimum driveability and performance.
NOTE: Distance varies with vehicle application.
RENDER: 1.0x
NO RELATED
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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.