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DTC CODE DTC DETECTION CONDITION TROUBLE AREA While fuel-cut operation performed (during vehicle deceleration), A/F sensor current less than 0.7 mA for 3 seconds (2 trip detection logic) A/F sensor ECM HINT: Sensor voltage detection monitor Under air-fuel ratio feedback control, If the air fuel ratio sensor output voltage is below 2.8 V (very rich condition) for 5 seconds despite the rear heated oxygen sensor output voltage being below 0.59 V, the ECM stores DTC P2196 or P2198. Alternatively, if the air fuel ratio sensor output voltage is higher than 3.8 V (very lean condition) for 5 seconds despite the rear heated oxygen sensor output voltage being 0.21 V or higher, DTC P2195 or P2197 is stored. Sensor current detection monitor A rich air-fuel mixture causes a low air fuel ratio sensor current, and a lean air-fuel mixture causes a high air fuel ratio sensor current. Therefore, the sensor output becomes low during acceleration, and it becomes high during deceleration with the throttle valve fully closed. The ECM monitors the air fuel ratio sensor current during fuel-cut and detects any abnormal current values. 3UR-FBE ENGINE CONTROL SYSTEM: SFI SYSTEM: P2195-P219... |