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Home >> Audi >> 1987 >> 5000 CS, Standard >> Repair and Diagnosis >> Engine Performance >> Ignition System >> Testing (AUDI 5000CS QUATTRO & 5000CS Turbo) >> Cis-E Control Unit Fault Diagnosis >> Input Codes

Input Codes

  1. Turn ignition on. Engine warning light (on instrument panel) should come on. Start engine. Engine warning light should go off. Drive vehicle for at least 5 minutes to store necessary information in control unit memory. During test drive, accelerate engine above 3000 RPM and briefly accelerate using full throttle.
  2. DO NOT turn ignition off as this will erase control unit memory. Install a fuse in test terminal of fuel pump relay (in fuse/relay panel) for a minimum of 4 seconds and then remove.
    NOTE: Careful attention must be paid to flashing light, since there are no discernible break points between 4-digit number groups.
  3. Engine warning light will flash on for 2 1/2 seconds and then off for 2 1/2 seconds. Trouble codes will then be flashed as 4 digit numbers. After each flash there will be a 1/2 second pause before the next flash occurs. Adding flashes together will obtain each code digit.
  4. After each digit code is flashed, there will be a 2 1/2 second pause before the next digit is flashed. After fourth digit of number is flashed, a 2 1/2 second pause will follow before the next number is flashed.
  5. Code 4444 indicates no faults are stored in memory. For a complete list of input codes and their interpretation see BOSCH CIS-E (ELECTRONIC CONTROL) SYSTEM article in COMPUTERIZED ENGINE CONTROLS section.
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