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 MANUALSFORD1987F 250 4WD PICKUP V8-460 7.5LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSRELAYS AND MODULES - COMPUTERS AND CONTROL SYSTEMSENGINE CONTROL MODULEDESCRIPTION AND OPERATIONFAILURE MODE EFFECTS MANAGEMENT
1987 Ford F 250 4WD Pickup V8-460 7.5L
Failure Mode Effects Management
1987 Ford F 250 4WD Pickup V8-460 7.5LSECTION Failure Mode Effects Management
FMEM is an alternate system strategy in the ECA designed to allow improved vehicle drive should one or more sensor inputs fail.
When a sensor input is perceived to be out-of-limits by the ECA, an alternative strategy will be initiated. The ECA will substitute a fixed in-limit sensor value and will continue to monitor the faulty sensor input. If the faulty sensor operates within limits, the ECA will return to the normal Engine Running mode (strategy).
Code 98 will be displayed when FMEM is in effect.
The MIL ``Check Engine'' light will remain ON when the FMEM is in effect.
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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.