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.
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HOMESERVICE MANUALSMERCURY1991TRACER BASE, 4D SEDAN, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 60 (ENGINE CONTROLS - SYSTEM/COMPONENT TESTS - EEC-IV (3.0L))MODULES, RELAYS & SOLENOIDSSOLENOIDSNOTES
1991 Mercury Tracer Base, 4D Sedan, Automatic
Modules, Relays & Solenoids: Solenoids: Notes
1991 Mercury Tracer Base, 4D Sedan, AutomaticSECTION Notes
WARNING: This page is about a different car, the 1994 Mercury Topaz, 1994 Mercury Sable, 1994 Ford Tempo, and 1994 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.
- Secondary Air Injection By-Pass/Diverter (AIRB/AIRD) Solenoids Faults in secondary air injection solenoids or circuits should set a diagnostic trouble code. See QUICK TEST in appropriate TESTS W/CODES - EEC-IV (3.0L) article in the ENGINE PERFORMANCE section. If diagnostic trouble code has not been set, disconnect solenoid to be tested.
- Measure resistance between sensor terminals. If resistance is not 50-100 ohms, replace solenoid. If resistance is 50-100 ohms, solenoid is okay. Refer to CIRCUIT TEST KC in the appropriate TESTS W/CODES - EEC-IV (3.0L) article in the ENGINE PERFORMANCE section for additional circuit testing.
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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.