SYSTEM DESCRIPTION

Sensor | Input signal to ECM | ECM function | Actuator
Camshaft position sensor (PHASE) Crankshaft position sensor (POS) | Engine speed | Heated oxygen sensor 2 heater control | Heated oxygen sensor 2 heater
Engine coolant temperature sensor | Engine coolant temperature
Mass air flow sensor | Amount of intake air

The ECM performs ON/OFF control of the heated oxygen sensor 2 heater corresponding to the engine speed, amount of intake air and engine coolant temperature.
OPERATION

Engine speed | Heated oxygen sensor 2 heater
Above 3,600 rpm | OFF
Below 3,600 rpm after the following conditions are met.

- Engine: After warming up
- Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute and at idle for 1 minute under no load

ON