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 MANUALSSAAB20009-3 CONVERTIBLE (9400) L4-2.0L TURBO (B205)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSFUEL TANK PRESSURE SENSORDESCRIPTION AND OPERATION
2000 Saab 9-3 Convertible (9400) L4-2.0L Turbo (B205)
Fuel Tank Pressure Sensor: Description and Operation
2000 Saab 9-3 Convertible (9400) L4-2.0L Turbo (B205)SECTION Description and Operation
A differential pressure sensor is mounted on the tank. It compares the pressure in the tank with barometric pressure.
The pressure sensor is powered with 5V from the electronic control module.
Depending on the pressure difference between the tank and atmosphere, a proportional voltage is sent from the pressure sensor to the control module.
When there is no pressure difference, the voltage from the pressure sensor is approx. 2.5 V.
The pressure sensor is used by the OBD II diagnostics.
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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.