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 MANUALSHYUNDAI1991SONATA V6-3.0LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTEMISSION CONTROL SYSTEMSEXHAUST GAS RECIRCULATIONEGR CONTROL SOLENOIDDESCRIPTION AND OPERATION
1991 Hyundai Sonata V6-3.0L
EGR Control Solenoid: Description and Operation
1991 Hyundai Sonata V6-3.0LSECTION Description and Operation
The EGR Solenoid Valve is a solenoid operated, computer (ECU) controlled, vacuum switching valve. It functions to limit the operation of the EGR Valve, by interrupting its vacuum source, upon ECU command. The ECU reads the voltage signal from the coolant temperature sensor, to determine the engine's operating temperature, and determines when to allow EGR valve operation.
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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.