The basic K-Jetronic system consists of: an air flow meter to monitor the amount of air entering the engine; a fuel distributor integral with an air flow meter; cold start valve and auxiliary air device for starting a cold engine; heating controller. The cold start switch activates the cold start valve during the initial cold start for a period dependent on engine temperature.
The KE-Jetronic system uses the same basic system, but in addition, there are sensors that monitor engine speed, load and temperature. The signals from the sensors are processed by the electronic control unit (ECU), which includes a fuel pressure control unit in the fuel distributor. It maintains the pressure of the fuel pumped by the injectors. If the electronic system fails with a warm engine, the system will operate as K-Jetronic, thus allowing the vehicle to drive home.
MPI multi-point injection system) - a fully electronic engine management system that uses sensors that monitor engine speed, load and temperature.
The Mono-Jetronic system consists of a single injector unit mounted on the intake manifold like a carburetor. Electronic sensors monitor engine speed, load and temperature, and the signals are processed by an electronic control unit, as in the KE-Jetronic system.
Due to the complex electronic circuitry in many of these systems, some precautions must be taken to prevent damage.
- (A) Do not disconnect the battery while the engine is running
- (b) Do not use charger to start
- (V) Do not disconnect wiring with ignition on
- (G) Remove the control unit if the temperature exceeds 80°C, for example during hot painting
- (d) Before checking the compression in the engine cylinders, turn off the fuel pump control relay
The work given in the following chapters is recommended to be carried out by home mechanics, and in case of significant damage, contact an Audi dealer.
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