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 MANUALSSAAB1994900 S, 2D CONVERTIBLE, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC TESTINGIGNITION CHECKSTRIONIC IGNITION SYSTEM (900 SERIES)
1994 Saab 900 S, 2D Convertible, Standard
TRIONIC Ignition System (900 Series)
1994 Saab 900 S, 2D Convertible, StandardSECTION TRIONIC Ignition System (900 Series)
- Connect ISAT scan tester, following manufacturer's instructions. Turn ignition on. Select each individual coil from ISAT scan tool ACTIVATE menu and IGNITION COILS submenu. If all coils operate properly, go to step 3). If no coils operate, go to next step.
- Turn ignition off. Unplug 10-pin connector from Ignition Discharge Module (IDM), located atop engine. Turn ignition on. Connect test light between terminals No. 6 and 10 at IDM. Activate any coil with scan tool. If test light glows, temporarily substitute known good IDM and retest. If test light does not glow, repair power or ground wires to IDM.CAUTION: When performing the following step, position IDM with coils and spark plugs downward.
- Insert test spark plug into each spark plug receptacle. Ground spark plugs with Cable (86 10 867 ). Activate each coil. If no sparks occur, replace IDM. If sparks occur, replace appropriate spark plug.
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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.