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.
1983 Ford Ranger 2.2 PFACTORY OEM SERVICE PROCEDURE
2.8L EEC IV Testing
- Testing & Diagnosis
- Test Equipment
- Preparation
- Quick Tests
- Code/Test Menu (KOEO)
- Code/Test Menu (KOER)
- Code/Test Menu (Continuous)
- Pinpoint Tests
- Test A - No Start
- Test B - Battery Voltage
- Test C - Reference Voltage
- Test D - Air Cleaner Temperature (Act) Sensor Test (Code 24)
- Test E - Throttle Position Sensor (TPS) Test (Code 23)
- Test F - Engine Coolant Temp. (ECT) Sensor Test (Code 21)
- ECT Input High (Code 51)
- Test G - Code 22/Map Sensor
- Test H - EGR Valve Position (EVP) Sensor Test (Code 31)
- EGR Control Valve Solenoid Test (Codes 32, 33, 34)
- Rpm Too Low For EGR Test (Code 35)
- Test J - Code 41/Fuel Mixture
- Vacuum Switch Test (Code 42 & 47)
- Ego Sensor Test (Code 43)
- Test K - Code 25/Knock Sensor
- Test L - Air Management System Test (Code 44)
- Tad System Test (Code 45)
- Tab System Test (Code 46)
- Test M - Insufficient Rpm During Quick Test (Code 77)
- Insufficient Map Sensor Dynamic Response (Code 72)
- Insufficient TP Sensor Dynamic Response (Code 73)
- Test N - Code 12/Rpm Test
- Rpm Not Returning To Normal Test (Code 13)
- Test P - No Codes Displayed
- Invalid Codes Displayed
- Vehicle Stalls During Quick Test
- Output State Not Functioning Test
- Test Q - Spark Timing Check
- Test R - Idle Tracking Switch Test (Its) - (Code 58)
- Idle Tracking Switch Test (Its) - (Code 68)
- Test S - Neutral Drive Switch (Code 67)
- Test U - Wiggle Test
- Test X - Invalid Codes During Continuous Test
- Test Y - Power Input Test (Code 55)
- Test Z - Variable Voltage Choke
- Canister Purge Test
- Temperature Compensated Pump
- Wiring Diagrams
Factory Service Tools
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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.
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