AIR FUEL RATIO (A/F) SENSOR CONSTRUCTION/OPERATION [MZR‐CD (RF Turbo)]

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• Installed to the rear of the oxidation catalytic converter.

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• The wide-range air/fuel ratio sensor is a pump cell type sensor, using both oxygen concentration cell action and oxygen pump cell action, and can detect the oxygen concentration (air/fuel ratio of the air-fuel mixture) in the exhaust gas in all ranges, from lean to rich.
• A heater is built into the sensor to facilitate the activation of the A/F sensor at engine startup (when the exhaust gas temperature is low).

Operation

• The wide-range air/fuel ratio sensor converts the oxygen concentration in the exhaust gas into a current value, and sends the value to the PCM.
• The PCM calculates the λ (lambda) value of the air-fuel mixture based on the received current value.
• (λ (lambda)) = (actual air/fuel ratio)/14.7

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1 | Current (mA)
2 | λ (lambda)
3 | A/F