AIR FUEL RATIO (A/F) SENSOR, HEATED OXYGEN SENSOR (HO2S) HEATER CONTROL OUTLINE [L3 Turbo]

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• Stabilized oxygen concentrations, even when the exhaust gas temperature is low, are detected by controlling of the A/F sensor and HO2S, enabling feedback control of the fuel injection control even during cold-engine starting, improving emission performance when cold.
• When the exhaust gas temperature is high, the A/F sensor and HO2S is protected from sharp rises in its temperature by stopping energization to the A/F sensor and HO2S heater.
• Emission performance improvement and protection of the A/F sensor and HO2S have both been achieved by the duty control of the A/F sensor and HO2S according to the engine operation conditions (exhaust gas temperature).
• The water in the exhaust system at the engine start damages the A/F sensor and HO2S. The pre-heater control has bee adpted to prevent a damage.