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.
1992 Acura Legend Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Air Suction Control System
- Air suction valve is located at top rear of engine. Check all vacuum hose routing. Start and warm engine until cooling fan comes on. Disconnect vacuum hose No. 7 from air suction valve. See Fig 1 . Connect vacuum gauge to hose.
- If no vacuum is present, go to next step. If vacuum is present, disconnect 6-wire connector at air suction control solenoid, located at right front of engine compartment. See Fig 2 . If vacuum is still present, replace air suction control solenoid. If vacuum goes away, check for short in Gray wire between 6-pin connector and ECU terminal A17. If wire is okay, substitute a known good ECU and retest. If problem goes away, replace 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.