Attention! Do not touch the computer terminals with your hands - the engine control system is microprocessor-based, the electronic components of the computer can be damaged by electrostatic discharge.
Getting Started with Car Repair (especially if the operations are related to the dismantling of elements of the engine control system), remove the cable from the negative battery terminal.
Warning! When the battery is disconnected from the vehicle's mains, fault codes will be deleted from the ECU's RAM. Therefore, before checking the engine management system using diagnostic equipment (for example, DST-2M) do not remove the wires from the battery terminals.
In many cases, to check the elements of the engine control system, it is necessary to have a supply voltage in the electrical circuit of the system. At the same time, it is allowed to disconnect the wire blocks from the sensors and actuating elements of the engine control system only after the ignition is turned off.
Attention! Disconnect the wiring harness block from the computer only after removing the wire from the negative terminal of the battery.
If it is necessary to connect the battery to the car's electrical network during repairs, first make sure that the disconnected wires (terminal blocks, wire ends) do not close on "mass" and that the ignition is off. Connect the wire first to the positive battery terminal and then to the negative. Switch on the ignition only for the duration of the measurements.
Attention! The engine management system uses electronic components, the supply voltage of which is 5 V. Supplying voltage to them from the vehicle's electrical network (voltage in which more than 12 V) will damage the engine control system.