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 MANUALSSAAB19909000 S, 4D HATCHBACK, 2.0 L, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTSIDLE CONTROL SYSTEMAUTOMATIC IDLE CONTROL (AIC)
1990 Saab 9000 S, 4D Hatchback, 2.0 L, Standard
Automatic Idle Control (AIC)
1990 Saab 9000 S, 4D Hatchback, 2.0 L, StandardSECTION Automatic Idle Control (AIC)
- Remove glove box compartment. Pull out relay panel. Remove relay "E" (delay relay) for the A/C system. Start engine. Connect jumper lead between pins No. 16 and No. 30 on relay holder. Engine speed should increase. If not, go to next step.
- Check for voltage at pin No. 30 on relay holder. Check for continuity between Red/White wire and pin No. 16 on relay holder and pin No. 16 on ECU. If voltage is present at pin No. 30 and circuit to ECU is good, check operation of A/C delay relay. If relay is okay, substitute a known good ECU. If problem is corrected, replace original ECU.
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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.