Warning! Do not touch the ECU terminals with your hands. The engine management system is microprocessor-based, and the ECU electronic components may be damaged by electrostatic discharge.
Getting Started with Car Repairs (especially if the operations involve dismantling elements of the engine management system), remove the cable from the negative terminal of the battery.
Warning! When disconnecting the battery from the vehicle's network, the 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 engine management system components, it is necessary to have power supply voltage in the electrical circuit of the system. In this case, disconnecting the wire blocks from the sensors and actuators of the engine management system is allowed only after the ignition is turned off.
Attention! You can disconnect the wiring harness connector from the ECU only after removing the wire from the negative terminal of the battery.
If it is necessary to connect the battery to the vehicle's electrical system during repairs, first make sure that the disconnected wires (terminals of the pads, ends of the wires) do not short to ground and that the ignition is off. First connect the wire to the positive terminal of the battery, then to the negative. Turn on the ignition only for the duration of the measurements.
Attention! The engine management system uses electronic components with a supply voltage of 5 V. They are supplied with voltage from the vehicle's electrical network (voltage in which is more than 12 V) will result in failure of the engine management system.