Audi 90 & 5000S Fault Code Memory Input
- When a fault exists while driving the vehicle the fault warning light will come on. DO NOT turn ignition off as this will erase fault memory (except on California models). To set fault codes, drive vehicle for a minimum of 5 minutes. During test drive, accelerate engine to 3000 RPM and depress accelerator fully at least one time. If light remains off, test is over. No fault has been detected.
- Always use fault memory system when diagnosing ignition system problems. Ensure the following conditions exist:
- Fault warning light okay.
- Fuses 13, 24 and 28 okay.
- Fuse 19 okay (California vehicles).
- A/C is turned OFF.
- Ground circuit connections in engine compartment are okay.
- Insert any spare fuse into the test terminal of fuel pump relay (in fuse relay panel) for a minimum of 4 seconds and then remove. Engine warning light will start blinking.
- Trouble code digits will flash in groups of 4. Each group of flashes is one digit of the fault code. After each group is flashed, there will be a 1/2 second pause before the next digit is flashed. After each 4-digit code group is flashed, there will be a 2 1/2 second pause before the code is repeated. Code 4444 indicates no faults are presently stored in memory.
- When you are ready to receive the next code, insert the fuse into the relay terminal again. Repeat this process until you receive a signal that is repeatedly ON and OFF for 2 1/2 second intervals. This indicates the end of the ignition fault codes. If you reinsert the fuse at this time you will begin to receive fuel injection system fault codes. For a complete list of input codes and their interpretation see BOSCH CIS-E III (ELECTRONIC CONTROL) SYSTEM or DIGITAL CONTROL SYSTEM article in COMPUTERIZED ENGINE CONTROLS section.
Courtesy of AUDI OF AMERICA, INC.