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 S, 2D HATCHBACK, AUTOMATICREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC TESTINGIGNITION CHECKSECU ADAPTATION
1990 Saab 900 S, 2D Hatchback, Automatic
Ecu Adaptation
1990 Saab 900 S, 2D Hatchback, AutomaticSECTION Ecu Adaptation
NOTE:
If power supply to the ECU has been disrupted, new data must be entered to refamiliarize the system with driveability patterns.
- Expose Throttle Position Sensor (TPS) terminals by pulling back rubber boot. Connect jumper wire between terminals No. 1 and 2.
- To reprogram the system, vehicle must accelerate at full throttle from 2000-3500 RPM. Because programming occurs at 2750-3250 and requires 3 seconds to complete, the procedure should be performed in highest gear possible.NOTE: For other distributorless (direct) ignition system tests, see TESTS W/CODES article.
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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.