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.
1991 Acura Legend Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Idle Control System: EACV
- Turn engine off, and disconnect 2-wire connector on EACV. Measure resistance between both terminals on EACV. Replace EACV if resistance is not 8-15 ohms. If resistance is okay, check each terminal for continuity to ground. If continuity is present, replace EACV.
- If continuity is not present, turn ignition on. Measure voltage between Black/Yellow and Blue/Red wire terminals of EACV connector. If battery voltage is not present, go to next step.
- If battery voltage is not present, repair open in Black/Yellow wire between EACV connector and main relay located on left side of firewall. If battery voltage is present, connect PGM-FI test harness connector "A" to main wire harness only; DO NOT connect to ECU.
- Connect and disconnect jumper wire between terminals A9 and A26. If EACV does not click, replace EACV. If EACV clicks, substitute a known good EACV, and recheck symptom.
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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