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
Code 17, Vehicle Speed Sensor
- Block rear wheels and set parking brake. Raise front of vehicle and support with stands. Connect system checker harness between ECU and connector. Turn ignition on.
- Slowly rotate left front wheel and measure voltage between terminals B16 (pos.) and A18 (neg.). If voltage pulses from 0-5 volts, proceed to step 5). If voltage does not pulse, turn ignition off.
- Disconnect connectors from ECU only, not from main harness. Turn ignition on. Slowly rotate left front wheel and measure voltage between terminals B16 (pos.) and A18 (neg.). If voltage pulses from 0-5 volts, substitute a known good ECU. If condition is rectified,replace original ECU.
- If voltage does not pulse from 0-5 volts, repair open or short in White/Blue wire between ECU terminal B16 and speed sensor or replace faulty speed sensor.
- Substitute a known good ECU. If condition is rectified, replace original ECU.
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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