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 MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSAIR FLOW METER/SENSORTESTING AND INSPECTION
1991 Hyundai Sonata V6-3.0L
Air Flow Meter/Sensor: Testing and Inspection
1991 Hyundai Sonata V6-3.0LSECTION Testing and Inspection
Air Flow Sensor Location:
To test the Air Flow Sensor, located inside the air cleaner housing, proceed as follows.
Air Flow Sensor, Test Hook-up:
Air Flow Sensor System:
1. Connect a voltmeter between terminal 6 and 3 of the Air Flow Sensor (AFS) connector.
Terminal 6: Sensor ground
Terminal 3: AFS output
NOTE: To test pins do not remove the connector, instead insert a straight pin or needle from the back side of the connector to access the pin.
2. Warm the engine and bring it to a normal idle.
3. Measure the voltage of terminals 6 and 3 at both RPMs, to determine if it is within the given value.
Standard Values
Engine speed(rpm) Output voltage(V)
Idling to 3,000 RPM......2.7-3.2
NOTE: If the air flow sensor fails, the intake air volume cannot be measured and as a result, normal fuel injection control is no longer available. However, the vehicle will run using the pre-programmed map value.
RENDER: 1.0x
NO RELATED
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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.