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 MANUALSSAAB19919000 CD, 2.3 M, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTSIDLE CONTROL SYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTSAUTOMATIC IDLE CONTROL (AIC)
1991 Saab 9000 CD, 2.3 M, Standard
Automatic Idle Control (AIC)
1991 Saab 9000 CD, 2.3 M, StandardSECTION Automatic Idle Control (AIC)
- Connect ISAT Scan tester according to manufacturer's instructions. Diagnostic connector is under right front seat, protected by a plastic cover. Turn ignition on. Enter command code 553. Listen for sound from AIC valve, located on intake manifold.
- If no sound, leave ignition on. Check that battery voltage is available at pin No. 2 (Blue/Red wire) on AIC valve. If no voltage, repair Blue/Red and Green/White wires to pin No. 87 of main relay.
- Turn ignition off. Unplug connector from AIC valve. Measure resistance between pins No. 1 and No. 2 (Blue/Red and Blue/White wires on mating connector).
- Measure resistance between pins No. 2 and No. 3 (Gray/Red wire on 900 Series; Green/Gray wire on 9000 Series) and Blue/Red wires on mating connector. Replace AIC valve if resistance is not 10-15 ohms for each measurement.
- With ignition off, check Blue/White wire between AIC valve connector and pin No. 33 on fuel injection ECU for open or short circuit. Repair wire if defective.
- With ignition off, check Gray/Red (900 Series) or Green/Gray (9000 Series) wire between AIC valve connector and pin No. 15 on fuel injection ECU. Repair wire if it is shorted or open.
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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.