Do not start the engine with a loose battery.
Never disconnect the battery while the engine is running.
When charging the battery with a quick charger, disconnect the battery from the electrical system. Do not use a quick charger to start the engine.
Before checking the injection system, make sure that the ignition system is working properly, that is, the ignition and spark plugs correspond to the specified parameters.
At temperatures above +80°С (drying after painting) remove the electronic control unit.
Make sure all connectors are securely connected.
Do not disconnect or connect the ECM connector with the ignition on.
When checking compression, turn off the power to the fuel pump relay by pulling out the main relay of the injection system.
The system is under pressure. Therefore, before replacing parts, depressurize the system. To do this, carefully disconnect the fuel supply line and place a cloth around the line.
If the engine has stood for several hours, the pressure is released during this time by itself.