PR25DD engine
FUNCTIONS WITHIN THE SYSTEM
ECM judges the state of air fuel ratio with this signal, and precisely controls air fuel ratio to match the stoichiometric ratio. Also, the sensor is equipped with heater for maintaining the activated state.
INDIVIDUAL FUNCTION WITHIN THE SYSTEM
A/F Sensor 1
The A/F sensor 1 transmits the signal of detected oxygen concentration in the exhaust gas to ECM.
A/F Sensor 1 Heater
The A/F sensor 1 heater activates A/F sensor 1.
INDIVIDUAL OPERATION
A/F Sensor 1
While O2 sensor changes output voltage by ON/OFF (rich/lean) mode within a narrow range of the stoichiometric ratio, the A/F sensor changes output voltage between 0 - 4 V for a wide range of air fuel ratio.
A/F Sensor 1 Heater
The ECM performs ON/OFF duty control of the A/F sensor 1 heater corresponding to condition to keep the temperature of A/F sensor 1 element within the specified range.
Component Location