The KE-III-Jetronic system has taken another step forward in the field of electronics. It makes up together with a fully electronic ignition system "VEZ" complete engine management system. Although each of the systems uses its own control devices, data is exchanged between them. In addition, these systems often receive information from the same sensors. A diagnostic system with memory is used for troubleshooting.
Elements of the KE-III-Jetronic injection system
1 fuel distributor
2 Cork (pressure measuring point)
3 Fuel return hose.
4 Piping from the fuel tank
5 Hollow bolt
6 Adjusting rod
7 Seal
8 Activated charcoal tank valve (magnetic)
9 Grid
10 Crankcase ventilation sludge
11 Air quantity meter
12 Potentiometer
13 Protective plug
14 Seal
15 Adjusting rod stop
16 Pressure sensor
17 Anti-magnetic bolt
18 Ventilation pipe (to air filter)
19 Pressure regulator
A. To injector
B. To cold start valve
B. To the activated charcoal container
D To throttle body
D. To the idle stabilization channel
Distinguishing devices of the KE-III-Jetronic system
Pressure regulator
It replaces the warm-up regulator because it does not change the pressure acting on the control piston, but controls the pressure in the slots (splines) for fuel mixing. As a result, the amount of fuel can vary in a ratio of 1:2.5, depending on the current passing through the coil.
Electronic control unit
Via the multi-pin plug, the control unit receives information from the following parts:
- From the starter about the beginning and end of the engine start cycle.
- From the Hall sensor in the ignition distributor about engine speed.
- From the lambda probe in the exhaust manifold about the amount of oxygen in the exhaust gases.
- From the potentiometer on the air flow meter about the position of the measuring plate.
- From the temperature sensor about the coolant temperature. In accordance with the operating conditions, the signals are processed into a current of the appropriate magnitude and transmitted further to the regulator coil.
- Even more extensive is the information for the control unit of the KE-III-Jetronic system. This unit receives additional data from the ignition system from the height sensor (atmospheric pressure) and from an automatic transmission. As a rule, it is located together with the height sensor on the right in the front passenger's footwell.
Diaphragm pressure regulator
It is located next to the mixture regulator and performs the same task as the pressure regulator of the K-Jetronic system. The operating pressure of the KE-III-Jetronic system is 6.1-6.5 bar.
Potentiometer
It determines the position of the measuring plate of the air mass meter and transmits this information in the form of a voltage signal further to the control unit.
Fuel cut-off valve
Coasting fuel cut-off valve (2) located on the air filter housing (1) near the mixture regulator (3). The diagram shows the principle of operation of the fuel cut-off valve.
1 to engine
2 Air mass meter
3 Fuel cut-off valve
4 Incoming air
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