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

AIR FUEL RATIO (A/F) SENSOR, HEATED OXYGEN SENSOR (HO2S) HEATER CONTROL OPERATION [L3 Turbo]SM1934758

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Pre-heater Control

Operation condition

• From the engine start to the threshold time: The PCM supplys voltage of approx. 6 V.

Cycle Estimated Control

Operation condition

• The PCM operates the A/F sensor, HO2S when the following conditions are met.

Item	Activation condition	Drive signal
A/F sensor	• After engine start • After the engine has started and a fixed period of time has elapsed (the elapsed time period after the engine starts is determined by ECT). • Battery positive voltage is 10 V or more and less than 18 V.	• The PCM outputs a duty signal. • The element temperature is measured by the impedance of the A/F sensor and a duty ratio is determined.
HO2S	• Starter is off • After engine start • After the engine has started and a fixed period of time has elapsed (the time period after the engine starts lengthen if the ECT falls below 0 °C {32 °F}. • Charging efficiency is the fixed value or less, or during fuel cut.	• The PCM outputs a duty signal. However the duty signal is either 100 % or 0 %.