Mono-Jetronic injection system

• 1 - control unit
• 2 - plug connector

For actuator motor and throttle angle sensor.

• 3 - end damper

For throttle valve.

• 4 - plug connector

For valve injector and intake air temperature sensor.

• 5 - actuator and throttle angle sensor
• 6 - temperature controller

For intake air heater.

• 7 - valve injector with intake air temperature sensor
• 8 - fuel pressure regulator
• 9 — a plug socket of an inlet air heater
• 10 - control valve

For vacuum ignition timing controller.

• 11 - central injection system
• 12 - throttle potentiometer
• 13 - water separator

For throttle potentiometer.

• 14 - control lamp for electronic engine control devices

The plug connector for vehicle diagnostics is located next to the gear lever.

• 15 - plug connector

For oxygen sensor.

• 16 - solenoid valve I

For activated carbon system, grey.

• 17 - solenoid valve II

For activated carbon system, black.

• 18 - preliminary resistance

For valve injector.

• 19 - temperature sensor

For injection system, blue.

• 20 - thermal switch

For intake air heater, red.

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Mono-Jetronic is an electronic petrol injection system that injects fuel intermittently, i.e. cyclically. Unlike the Digifant and K-Jetronic systems, injection is carried out by one central valve nozzle for all cylinders. The distribution of fuel to individual cylinders occurs, as in the presence of a carburetor, through the intake manifold.


Air is drawn in by the engine through the air filter and fed into the central injection system. In the body of the central injection system, as in the presence of a carburetor, there is a throttle valve associated with gas draft. The throttle opening angle is determined by a potentiometer. This angle, along with the speed of the crankshaft, serves for the control unit as a measure of the amount of air that has entered the engine.

The control unit, in accordance with the measured amount of air and the instantaneous speed of the crankshaft, which is determined by the ignition system, regulates the duration of injection and thus the amount of injected fuehp a longer opening of the valve injector, more fuel is injected. Additional sensors and converters ensure that the amount of injected fuel is measured correctly in any driving situation.

The throttle angle sensor sends a signal to the control unit that the throttle has reached the idle position. The control unit opens or closes the throttle valve via the actuator motor and regulates the idle speed according to the prescribed value.

The temperature sensor on the coolant pipe measures the temperature of the engine.

The intake duct temperature sensor measures the air temperature.

Oxygen sensor (Lambda probe) measures the oxygen content in the exhaust gas stream. In accordance with its signal, the control unit maintains the content of harmful substances in the exhaust gases at the lowest level. In vehicles with catalysts, the composition of the exhaust gases is maintained optimal for the operation of the catalysts.

Mopo-Motronic injection system

The Mono-Motronic system is identical in design to the Mono-Jetronic system down to the integrated ignition system. By integrating the ignition system with the injection system, the ignition is better adapted to the respective operating conditions. Most of the following operations and data for the Mono-Jetronic system also apply to the Mono-Motronic system.