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 DIAGNOSISPOWERTRAIN MANAGEMENTTECHNICAL SERVICE BULLETINSALL TECHNICAL SERVICE BULLETINSEEC SYSTEM ELECTRICAL SCHEMATIC - MANUAL REVISION
1990 Ford Ranger 4WD L4-140 2.3L SOHC
EEC System Electrical Schematic - Manual Revision
1990 Ford Ranger 4WD L4-140 2.3L SOHCSECTION EEC System Electrical Schematic - Manual Revision
90ford15
ENGINE/EMISSIONS DIAGNOSIS SHOP MANUAL - 1990 - PAGE 16-7 - ELECTRICAL SCHEMATIC FOR EEC SYSTEM REVISED
Article No. 90-6B-40
LIGHT TRUCK: 1990 BRONCO II, RANGER
ISSUE: The illustration of the Ranger/Bronco II (49 States) EEC-IV Engine Supplement Electrical Schematic shown on page 16-7 in the Engine Emissions Diagnosis Shop Manual is incorrect.
ACTION: Refer to the pages following this TSB article for the correct schematic.
OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: INFORMATION ONLY
OASIS CODES: 2800
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.