In order to avoid injury to people and malfunction of the fuel injection and pre-glow system, it must be taken into account that the wire terminals of the pre-glow and fuel injection system, as well as instrumentation, are connected and disconnected only with the ignition off. If you want to crank the engine at the starting speed, but do not start it, for example, when checking compression, then the plug connector of the unit injector on the cylinder head must be disconnected.
Before disconnecting the battery terminals, it is necessary to find out the codes of radio devices that are coded in case of theft. Disconnecting and connecting the battery terminals should only be done with the ignition off, otherwise the control unit of the diesel direct injection system can be damaged. When performing some checks, the control unit may recognize the error and store it in memory. Therefore, at the end of all checks and repair work, it is necessary to interrogate the fault memory and delete any error data that may have been stored in it.
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