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 Honda Prelude Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Control Unit Connector
- On all models, turn ignition on and check for voltage at control unit connector Blue wire. Voltage should be present. If voltage is not present, check Blue wire between ignition coil and control unit.
- On all models, turn ignition on and check for voltage at control unit connector Black/Yellow wire. Voltage should be present. If voltage is not present, check wiring and ignition fuse.
- Check Brown/Black (Civic and Prelude models) or Black (Accord models) wire for continuity between control unit and body ground. Continuity should be present.
Factory Service Tools
Use the Manual With the Right Hardware
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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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