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.
1987 Ford Cab & Chassis 5.8 H, 4WD, AutomaticFACTORY OEM SERVICE PROCEDURE
Code 2 - Open Isolate Circuit
- Unplug computer module connector. Check resistance between terminal No. 13 and ground. If resistance is 3-6 ohms, replace computer module. If resistance is greater than 6 ohms, unplug electro-hydraulic valve connector. Check resistance between terminal No. 3 and ground.
- If resistance is one ohm or more, repair open circuit. If resistance is less than one ohm, check resistance between terminals No. 2 and 3. If resistance is 3-6 ohms, repair open in wire between terminal No. 2 and computer module. If resistance is over 6 ohms, replace electro-hydraulic valve.
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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