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 SYSTEMSBAROMETRIC PRESSURE SENSORTESTING AND INSPECTION
1991 Hyundai Sonata V6-3.0L
Barometric Pressure Sensor: Testing and Inspection
1991 Hyundai Sonata V6-3.0LSECTION Testing and Inspection
To test the Barometric Pressure Sensor, located on the air flow sensor, in the air cleaner housing. Remove the air flow sensor (AFS) connector and proceed as follows.
Barometric Pressure Sensor, Test Hook-up:
1. Connect a voltmeter between terminals 5 and 6 of the AFS Sensor connector.
Terminal 5: Barometric sensor output
Terminal 6: sensor ground
2. Warm the engine and bring it to a normal idle.
Barometric Pressure Sensor Test:
3. Slowly cover about half of the air cleaner air intake, observing the change in voltage. As pressure falls (vacuum increases), you should observe a drop in voltage. This should be sufficient to determine if the sensor is functional.
As a reference, with the use of a vacuum gauge, under sea level conditions:
Ambient pressure ...Approx. 4.00v
Vacuum 16in.Hg......Approx. 1.84v
Vacuum 24in.Hg......Approx. 0.79v
4. Replace the air flow sensor if necessary.
RENDER: 1.0x
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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.