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 MANUALSLEXUS1994SC 300 L6-3.0L (2JZ-GE)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSBAROMETRIC PRESSURE SENSORDESCRIPTION AND OPERATION
1994 Lexus SC 300 L6-3.0L (2JZ-GE)
Barometric Pressure Sensor: Description and Operation
1994 Lexus SC 300 L6-3.0L (2JZ-GE)SECTION Description and Operation
PURPOSE / OPERATION
The Barometric Pressure Sensor sensor is built into the Engine Control Module. This is a semiconductor pressure sensor with properties which cause its electrical resistance to change when stress is applied to the crystal within the sensor. The resulting piezoelectric effect creates a resistance which alters a reference signal from the Engine Control Module in response to changes in atmospheric pressure. Fluctuations in the air pressure cause changes in the intake air density, which can cause deviations in the air-fuel ratio. The signals from Barometric Pressure Sensor sensor are used to make corrections for these fluctuations. If the Engine Control Module records Diagnostic Trouble Code "35", the fail safe function operates and the atmospheric pressure is set at a constant 101.3 kPa (760 mmHg, 29.92 in.Hg).
The Barometric Pressure Sensor sensor is built into the Engine Control Module. This is a semiconductor pressure sensor with properties which cause its electrical resistance to change when stress is applied to the crystal within the sensor. The resulting piezoelectric effect creates a resistance which alters a reference signal from the Engine Control Module in response to changes in atmospheric pressure. Fluctuations in the air pressure cause changes in the intake air density, which can cause deviations in the air-fuel ratio. The signals from Barometric Pressure Sensor sensor are used to make corrections for these fluctuations. If the Engine Control Module records Diagnostic Trouble Code "35", the fail safe function operates and the atmospheric pressure is set at a constant 101.3 kPa (760 mmHg, 29.92 in.Hg).
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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.