Magneti Marelli S.p.a.

Marco Ceroni

Piero Maria Carbonaro

A method performs a diagnosis of a lambda sensor of a 'UEGO' type of an exhaust system for an internal-combustion engine. The lambda sensor includes a series of pins. The diagnosis method comprises steps of: heating the lambda sensor to cause the lambda sensor to reach an inner temperature that is higher than about 600&#xb0; C.; polarizing a first one of the pins by connecting the first pin to a supply voltage through a first limiting resistance; measuring a voltage of all of the pins while the first pin is connected to the supply voltage; and diagnosing a presence of a short circuit to an electrical ground if the voltage of at least one of the pins is lower than a predetermined threshold. A control unit performs the diagnosis.

Diagnosis method and control unit for performing a diagnosis of a lambda sensor of the UEGO type of an exhaust system for an internal combustion engine

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Turin, Italy

Marco Ceroni