aid of a temperature sensor or the determination of a fuel injection amount and a composition of a fuel air mixture for the internal combustion engine control unit 1 is furthermore configured to carry out one preferred specific embodiment of a method according to the present invention security processor unit 200 here monitors processes 312 313 322 323 331 332 333 carried out by processor unit 100 one preferred specific embodiment of a method according to the present invention is depicted schematically in fig2 as a block diagram 400 and is described below as an example with reference to fig1 and 2 in the following specific example the case is considered that the security processor unit 200 monitors the two processes 322 and 331 in the course of process 322 the cooling water temperature for example is detected in the course of process 331 the fuel injection amount for example is determined in the course of the regular operation of control unit 1 the cooling water temperature is detected at fixed time intervals of 10 ms the fuel injection amount is determined at fixedly predefined angle values of the crankshaft angle of the internal combustion engine for example at a crankshaft angle of 90 u00b0 kw a process criterion for process.