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.
1989 Audi 90 Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Primary Resistance
- On version one, disconnect ignition coil power stage connector and ignition coil wire. See Figure . On version 2, disconnect ignition coil power stage connector and remove screw from top of assembly. See Fig 1 .
- Connect Multimeter (US 1119) between terminals No. 1 and No. 15. See Fig 2 and Fig 3 . Reading should be between .5-1.5 ohms. If not within specification, replace ignition coil.
- If secondary and primary resistance values are within specification and there is still no ignition, replace ignition coil with power stage as an assembly.
Factory Service Tools
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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.