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 80 Base, AutomaticFACTORY OEM SERVICE PROCEDURE
Hall Sender
- Disconnect coil wire from distributor cap. Using a jumper wire, ground coil wire. Disconnect hall sender-to-ICU harness connector.
- Connect multimeter between terminals No. 1 and No. 3 of connector "D". See Fig 1 . Turn ignition on. Reading should be at least 9 volts. If not to specification, repair break in wiring. Turn ignition off.
- If step 2) tests satisfactory, push back rubber boot on hall sender connector. Connect multimeter between terminals No. 1 and No. 2. Reconnect hall sender-to-ICU harness connector.
- Turn ignition on. Remove ignition distributor cap, rotor and dust cap. DO NOT allow spring clips to fall inward toward trigger wheel.
- Using Wrench (2079), turn crankshaft until trigger wheel is clear of hall sender. Multimeter should read a minimum of 4 volts. Turn crankshaft until trigger window is aligned with hall sender.
- Reading should be between .0-.5 volts. Turn ignition off. If reading was not to specification, replace hall sender. If reading was correct, check wiring between hall sender connector and ICU.
- Remove ICU cover from left side kick panel. Disconnect harness connector from ICU and Connector "D" from distributor. Check for continuity between distributor connector pins and appropriate 25-pin ICU connector pins. For correct pin-to-pin reference, See Fig 2 . Also see WIRING DIAGRAMS - CEC article in this section.
- If hall sender and wiring between connector "D" and ICU connector tested satisfactory, replace ICU. See Fig 1 .
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.