SYSTEM DESCRIPTION

Sensor
Input signal to ECM
ECM function
Actuator
Camshaft position sensor (PHASE)
Crankshaft position sensor (POS)
Engine speed
Air fuel ratio (A/F) sensor 1 heater control
Air fuel ratio (A/F) sensor 1 heater
Mass air flow sensor
Amount of intake air

The ECM performs ON/OFF duty control of the A/F sensor 1 heater corresponding to the engine operating condition to keep the temperature of A/F sensor 1 element within the specified range.