What is the cause of the Audi p223700 pump current open circuit fault?
1 Answers
Audi p223700 pump current open circuit fault is caused by the oxygen sensor positive current circuit/open circuit. The following is an introduction about the sensor: 1. Introduction: In engines using a three-way catalytic converter to reduce exhaust pollution, the oxygen sensor is an essential component. Since the purification ability of the three-way catalyst for CO, HC, and NOx drops sharply once the air-fuel ratio of the mixture deviates from the theoretical air-fuel ratio, an oxygen sensor is installed in the exhaust pipe to detect the oxygen concentration in the exhaust and send a feedback signal to the ECU. The ECU then controls the increase or decrease of the fuel injector's fuel injection volume, thereby keeping the air-fuel ratio of the mixture near the theoretical value. 2. Function: The sensor's role is to determine whether there is excess oxygen in the engine's exhaust after combustion, i.e., the oxygen content, and convert the oxygen content into a voltage signal transmitted to the engine computer, enabling the engine to achieve closed-loop control targeting the excess air factor; ensuring that the three-way catalytic converter has the maximum conversion efficiency for the three pollutants in the exhaust: hydrocarbons (HC), carbon monoxide (CO), and nitrogen oxides (NOX), maximizing the conversion and purification of emission pollutants.
