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The connectors can only be used to connect the reader. Two 2-pin connectors in the passenger footwell niche under the dashboard or in the fuse box in the engine compartment next to the partition. The connectors can be used both for extracting “flashing” codes, and for the reader. Bosch Motronic 2.4įour 2-pin connectors in the passenger footwell niche under the dashboard. Two 2-pin connectors under the cover above the pedals in the driver’s leg niche, or three 2-pin connectors under the cover above the pedals in the driver’s footwell or in the fuse box in the engine compartment next to the partition. Two 2-pin connectors under the cover above the pedals in the driver’s leg niche.

The BEU is usually located in the footwell on the driver’s or passenger’s side, or in the engine compartment behind the partition. Two 2-pin connectors in the passenger footwell for the passenger under the dashboard or in the fuse box on the left in the engine compartment next to the bulkhead. Two 2-pin connectors in the passenger footwell for flashing codes and for the reader. Mono-Jetronic (Audi 80 and 100 1.8i release since August 1988) Mono-Jetronic (Audi 80 and 100 1.8i release until July 1988)Ībove the fuel pump relay for “flashing” codes only. After troubleshooting, the system returns to normal operation. This mode allows the car to reach the garage or service station for inspection and repair, albeit with less efficiency. This means that if some malfunctions occur (not all malfunctions cause this mode to be activated), the engine control system is guided not by the sensor readings, but by its reference value. The described Audi systems have a mode of limited controllability (a function known as “limp home” or “crash home”). Such systems include: Bosch Motronic versions 2.9, 3.2 and 3.8.2, Mono-Motronic MA1.2.2 (with a new 45-pin BEU connector), Simos, VAG Digifant (with 68-pin connector) and VAG MPi and MPFi. Even later systems generate only 5-digit fault codes, which can only be retrieved using a reader.Among these systems are: Bosch Motronic versions 2.3, 2.4 and 2.7, KE-3 Jetronic, KE-Matronic and Mono-Motronic (with the old 45-pin connector BEU). A reader is required to extract 5-digit codes. 4-digit codes are read using the warning light (if any) or by means of an LED.

Later systems can generate both 4- and 5-digit codes.

Such systems include Mono-Jetronic and Mono-Motronic MA 1.2.1.

Some early release systems can only generate 4-character codes that can be retrieved using a warning light on the instrument panel (if one is provided), using an LED or code reader.

Cars that are currently in operation can be divided into three groups (the point of separation is not always obvious even for the same model). In the process of improving Audi cars, the codes and ways of reading them changed. Fault codes will not appear in cases where the defective item is not under the control of the ACM and when a faulty situation is not provided for by its software.Ĭontrol systems installed on Audi vehicles can generate fault codes of two types – 4-digit (“ flashing“) and 5-digit. If the diagnostic program detects a mismatch, one or more corresponding fault codes are recorded in the electronic control unit (ECU) memory. The exception is Mono-Jetronic and KE-3 Jetronic, which control the fuel supply and idling separately.Įngine control systems have a self-diagnostic function that continuously analyzes the signals of the sensors and actuators of the engine and compares them with the reference values.

All systems control the primary circuit of the ignition system, the fuel injectors and the idling system from one control module. Audi cars are equipped mainly with Bosch control systems, including: Bosch Motronic versions 2.3.2, 2.4, 3.2 and 3.8.2, Mono-Jetronic, Mono-Motronic 1.1 and 1.2, KE-Motronic 1.1 and 1.2, KE- 3 Jetronic, Simos, VAG Digifant, VAG MPi and VAG MPFi.