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Last Modified: 9-16-2014 6.6 C Doc ID: RM000000WC40WGX Model Year: 2015 Model: Tundra Prod Date Range: [08/2014 - ] Title: 1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2195-P2198; Oxygen (A/F) Sensor Signal Stuck Lean (Bank 1 Sensor 1); 2015 MY Tundra [08/2014 - ] DTC P2195 Oxygen (A/F) Sensor Signal Stuck Lean (Bank 1 Sensor 1) DTC P2196 Oxygen (A/F) Sensor Signal Stuck Rich (Bank 1 Sensor 1) DTC P2197 Oxygen (A/F) Sensor Signal Stuck Lean (Bank 2 Sensor 1) DTC P2198 Oxygen (A/F) Sensor Signal Stuck Rich (Bank 2 Sensor 1) DESCRIPTION The A/F sensor generates a voltage* that corresponds to the actual air-fuel ratio. This sensor voltage is used to provide the ECM with feedback so that it can control the air-fuel ratio. The ECM determines the deviation from the stoichiometric air-fuel ratio, and regulates the fuel injection time. If the A/F sensor malfunctions, the ECM is unable to control the air-fuel ratio accurately. The A/F sensor is the planar type and is integrated with the heater, which heats the solid electrolyte (zirconia element). This heater is controlled by the ECM. When the intake air volume is low (the exhaust gas temperature is low), a current flows into the heater to heat the sensor in order to facilitate accurate air-fuel ratio detection. In addition, the sensor and heater portions are the narrow type. The heat generated by the heater is conducted to the solid electrolyte through the alumina, and therefore the sensor activation is accelerated. must be precisely controlled so that it is always close to the stoichiometric level. *: Value changes inside the ECM. Since the A/F sensor is a current output element, a current is converted into a voltage inside the ECM. Any measurements taken at the A/F sensor or ECM connectors will show a constant voltage. 1UR-FE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2195-P2198;... |