AIR FUEL RATIO (A/F) SENSOR, HEATED OXYGEN SENSOR (HO2S) HEATER CONTROL OPERATION [MZR 1.6]

id0140j7782200

A/F sensor

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

Activation condition

Engine operation conditions

•  After the engine has started and a fixed period of time has elapsed (the elapsed time period after the engine starts is determined by exhaust gas temperature)

•  Battery positive voltage is 9 V or more and less than 16 V

•  The PCM outputs a duty signal

•  The element temperature is measured by the impedance of the A/F sensor heater and a duty ratio is determined

Activation condition	Engine operation conditions
• After the engine has started and a fixed period of time has elapsed (the elapsed time period after the engine starts is determined by exhaust gas temperature) • Battery positive voltage is 9 V or more and less than 16 V	• The PCM outputs a duty signal • The element temperature is measured by the impedance of the A/F sensor heater and a duty ratio is determined

HO2S heater

• The PCM operates the HO2S heater based on the following control conditions.

Output duty ratio

Control condition

0%

•  Engine stopped

•  Fuel cut injection control is in engine start zone

•  Engine coolant temperature is −10 °C {14 °F} or less

•  Other than battery voltage of 9—16 V

•  Within a fixed period of time after engine start (varies according to engine coolant temperature)

14.4―32.4%

•  HO2S not activated

0―100%

(Determined by engine speed and charging efficiency)

•  Other than the above

Output duty ratio	Control condition
0%	• Engine stopped • Fuel cut injection control is in engine start zone • Engine coolant temperature is −10 °C {14 °F} or less • Other than battery voltage of 9—16 V • Within a fixed period of time after engine start (varies according to engine coolant temperature)
14.4―32.4%	• HO2S not activated
0―100% (Determined by engine speed and charging efficiency)	• Other than the above