1987 Audi 5000 CS, AutomaticFACTORY OEM SERVICE PROCEDURE

Altitude Sensor

Depending on altitude or barometric pressure, the altitude sensor sends a varying voltage signal to the FICU to correct the air fuel mixture. The ICU also uses this signal to determine proper ignition timing. The altitude sensor is attached to the ignition control unit mounting bracket behind the left kick panel. See Figure .

Fig 1: CIS-E III Electronic Control System
G61283
Factory Service Tools

Use the Manual With the Right Hardware

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.