Abstract: A method for identifying a short circuit to the positive terminal of a battery in a circuit of a motor vehicle. An electronic circuit breaker HS (123) is actuated by a control device (120) and has at least one electrical switch which switches on and off loads (110, 111, 112), the switching state of said switches being reported to the control device (120) and determines that operation is fault-free when the connected loads (110, 111, 112) are supplied with voltage when the electronic circuit breaker HS (123) is switched on and a “short circuit” or “load drop” message is produced at the circuit breaker when the electronic circuit breaker HS (123) is switched off, switching off the supply voltage by the electronic circuit breaker HS (123) is detected at the end of a driving cycle of the motor vehicle. A fault is determined when a “short circuit” or “load drop” message is not produced at the electrical switch.

Abstract: A method of metering a fluid, pollutant-reducing medium, in particular an aqueous urea solution, into a motor vehicle exhaust system is proposed, in which the fluid medium is delivered to a nozzle module, in particular a nozzle or a valve, and introduced into the exhaust system by the nozzle module. A transport system arranged upstream of the nozzle module is activated with pulse-width modulation. The method and the associated metering system ensure that, in particular, a reducing agent is arranged or metered precisely and in a robust manner relative to degrees of coldness, with the use of few components.

Abstract: A method for identifying a short circuit to the positive terminal of a battery in a circuit of a motor vehicle. An electronic circuit breaker HS (123) is actuated by a control device (120) and has at least one electrical switch which switches on and off loads (110, 111, 112), the switching state of said switches being reported to the control device (120) and determines that operation is fault-free when the connected loads (110, 111, 112) are supplied with voltage when the electronic circuit breaker HS (123) is switched on and a “short circuit” or “load drop” message is produced at the circuit breaker when the electronic circuit breaker HS (123) is switched off, switching off the supply voltage by the electronic circuit breaker HS (123) is detected at the end of a driving cycle of the motor vehicle. A fault is determined when a “short circuit” or “load drop” message is not produced at the electrical switch.

Abstract: A procedure for checking the functionality of a metering valve (310) of a reducing agent system of a combustion engine, at which the metering device (105) is advanced from a tank (100) to the metering valve (310) with the aid of a controllable pump (12) at a constant pressure, comprising the metering valve (310) is impinged with a control variable that characterizes the causing of a status change of the metering valve (310), a variable is detected that characterized the flow rate of the pump (120), from this variable that characterizes the flow rate the functionality of the metering valve (310) is assumed.

Abstract: A procedure for checking the functionality of a metering valve (310) of a reducing agent system of a combustion engine, at which the metering device (105) is advanced from a tank (100) to the metering valve (310) with the aid of a controllable pump (12) at a constant pressure, comprising the metering valve (310) is impinged with a control variable that characterizes the causing of a status change of the metering valve (310), a variable is detected that characterized the flow rate of the pump (120), from this variable that characterizes the flow rate the functionality of the metering valve (310) is assumed.

Abstract: A method of metering a fluid, pollutant-reducing medium, in particular an aqueous urea solution, into a motor vehicle exhaust system is proposed, in which the fluid medium is delivered to a nozzle module, in particular a nozzle or a valve, and introduced into the exhaust system by the nozzle module. A transport system arranged upstream of the nozzle module is activated with pulse-width modulation. The method and the associated metering system ensure that, in particular, a reducing agent is arranged or metered precisely and in a robust manner relative to degrees of coldness, with the use of few components.