The ZMZ-4062 engine does not have the usual idling system, like in a carburetor
The function of the channels and the idle jet is performed by a microprocessor control unit using fuel injectors and an additional air regulator.
The regulator (РХХ-60 or 0280 140 545) is installed on the air intake system receiver.
It is an electric valve that regulates the air supply to the intake system bypassing the throttle valve, which ensures that the set idle speed is maintained at various engine operating modes (starting, warming up, engine braking, additional load from attachments).
In essence, this is an idle speed regulator.
If the regulator fails or there is a malfunction in its circuit, the control unit will turn on the KMSUD indicator lamp, and write the corresponding fault code into memory.
With a faulty regulator, the engine may stall at idle after starting and run at higher speeds.
If, due to mechanical damage or contamination, the butterfly valve becomes stuck, the engine will be unstable at idle.
Checking the secondary air regulator
Turn off the ignition and remove the negative terminal from the battery.
Using an awl or a thin screwdriver, unclip the block clamp and disconnect the regulator connector.
Using an ohmmeter, we measure the resistance of the two windings of the regulator, for which we connect one probe of the device to the central terminal, and the other, alternately to the outer terminals.
In a working regulator, the resistance of each winding should be in the range of 10–14 Ohms.
Having removed the regulator from the engine, we put a piece of PVC tube onto the central terminal and insert the end of the bare wire into it.
Connect the central terminal with the positive of the battery, the negative - alternately with the outer ones.
In one case the damper should open completely, in the other it should close
If this does not happen, lightly shake the regulator to ensure that the valve is not stuck.
We replace the faulty regulator.
Removing the secondary air regulator
We loosen the clamp with a screwdriver
Remove the air supply hose.
Use a screwdriver to loosen the lower hose clamp.
Using a 10mm wrench, unscrew the two bolts securing the regulator to the intake system receiver.
Remove the regulator assembly with the bracket by removing the lower pipe of the regulator from the hose.
Remove the steel clamp and rubber tube from the regulator.
Install the regulator in reverse order
During installation, we are guided by the diameter of the regulator pipes - the supply pipe is larger and should be located on top