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.
Secondary Air Injection By-Pass/Diverter (AIRB/AIRD)
Solenoids
Disconnect solenoid harness connector, and measure resistance across terminals. Resistance should be 50-100 ohms. If resistance is not as specified, replace solenoid. Faults in solenoid or circuit should set a diagnostic trouble code. See QUICK TEST procedures in the TESTS W/CODES - 5.8L EEC-IV article. If no diagnostic trouble code has been set, see CIRCUIT TEST KC in TESTS W/CODES - 5.8L EEC-IV article for additional solenoid and 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.