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 MANUALSSAAB1990900 SPG, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTSAIR INDUCTION SYSTEMS (TURBO)PRESSURE TRANSDUCER
1990 Saab 900 SPG, Standard
Pressure Transducer
1990 Saab 900 SPG, StandardSECTION Pressure Transducer
- Remove panel underneath dashboard (driver side). Unplug electrical connector from pressure transducer. Connect vacuum pump and pressure gauge to pressure transducer hose.
- Connect ohmmeter between Black/White and Green/Red wires of pressure transducer connector. Measure resistance. Resistance should be 8-13 ohms at atmospheric pressure.
- Increase pressure to approximately 14.5 psi (10.2 kg/cm2 ) and then let it drop to 8.7 psi (6.1 kg/cm2 ), while tapping lightly on pressure transducer bracket. Resistance should be 83-93 ohms at 8.7 psi (.61 kg/cm2 ). If readings are not as specified, replace pressure transducer.
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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.