Electric diagram of the integrated microprocessor engine control system (KMSUD)
The ZMZ-406 engine is equipped with a microprocessor ignition system, which consists of a control unit for fuel injection and ignition systems, two ignition coils types 30.3705 or 301.3705, spark plugs, high and low voltage wires.
The control unit is installed in the passenger compartment on the right side under the instrument panel, behind the upholstery of the sidewall of the body.
The ignition coils are mounted on the cylinder head cover.
The control unit receives signals from sensors installed on the engine and, based on this, corrects the ignition timing, which allows obtaining optimal power, economic and toxicity indicators.
The electrical circuit of the engine control system is shown in Figure 1.
ZMZ-402 and ZMZ-4021 engines are equipped with a non-contact ignition system, consisting of a transistor switch, ignition distributor type 19.3706, ignition coil type B116 or B116-01, candles and high-voltage and low-voltage wires.
Ignition distributor (1908.3706) - non-contact, with a sensor (generator) of control pulses and built-in vacuum and centrifugal ignition timing controllers.
The distributor sensor performs two functions: it sets the moment of sparking and distributes high voltage pulses to the cylinders in accordance with the order of their operation.
For this purpose, a slider is used, put on the shaft of the distribution sensor. An interference suppression resistor* is installed in the slider.
The switch (1313734) opens the power circuit of the primary winding of the ignition coil, converting the control pulses of the sensor into current pulses in the ignition coil.
* A cover with a central carbon contact is installed on the part of the sensors instead of a resistor.
The ignition installation with the ZMZ-402 engine can be found in the article: GAZ-3110 ignition installation