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.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSFORD1991RANGER 2WD L4-140 2.3L SOHCREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSENGINE CONTROL MODULEDESCRIPTION AND OPERATIONFAILURE MODE EFFECTS MANAGEMENT
1991 Ford Ranger 2WD L4-140 2.3L SOHC
Failure Mode Effects Management
1991 Ford Ranger 2WD L4-140 2.3L SOHCSECTION Failure Mode Effects Management
During some Distributorless Ignition System (DIS) faults, the Failure Mode Effects Management (FMEM) portion of the DIS module will maintain vehicle operation. If the ignition module does not receive the Spark Output (SPOUT) input signal, it will turn the coils ON and OFF using the Profile Ignition Pick-up (PIP) signal. In doing so, the timing and dwell are fixed at 10 degrees BTDC. If the module does not receive the Cylinder Identification (CID) input signal, random coil synchronization will be attempted. Several start attempts may be required before the engine will start.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.