AIR FUEL RATIO (A/F) SENSOR CONSTRUCTION/OPERATION [MZI-3.7]

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Construction

• Installed on the WU-TWC.

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• 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 all range A/F sensor is a limited current type sensor, 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.
• The all 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.

A/F sensor characteristic

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• (λ (lambda)) = (actual air/fuel ratio)/14.7