Toyota
Nissan Versa
 Sedan Service Manual
Engine » Engine control system (EC) » Engine control system
Heated Oxygen Sensor 2

The heated oxygen sensor 2, after three way catalyst (manifold), monitors the oxygen level in the exhaust gas.

Even if switching characteristics of the air fuel ratio (A/F) sensor 1 are shifted, the airfuel ratio is controlled to stoichiometric, by the signal from the heated oxygen sensor 2.

This sensor is made of ceramic zirconia. The zirconia generates voltage from approximately 1 V in richer conditions to 0 V in leaner conditions.

Under normal conditions the heated oxygen sensor 2 is not used for engine control operation.

Heated Oxygen Sensor 2

Heated Oxygen Sensor 2 Heater

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

Ignition Coil With Power Transistor

The ignition signal from the ECM is sent to and amplified by the power transistor. The power transistor turns ON and OFF the ignition coil primary circuit. This ON/OFF operation induces the proper high voltage in the coil secondary circuit.

    More about «Engine control system»:

    Accelerator Pedal Position Sensor

    Air Fuel Ratio Sensor 1

    Air Fuel Ratio Sensor 1 Heater

    Battery Current Sensor

    Camshaft Position Sensor

    Crankshaft Position Sensor

    Engine Oil Temperature Sensor

    EVAP Canister Vent Control Valve

    Exhaust Valve Timing Control Solenoid Valve

    Fuel Injector

    Fuel Pump

    Heated Oxygen Sensor 2

    Intake Air Temperature Sensor

    Intake Valve Timing Control Solenoid Valve

    Malfunction Indicator Lamp (MIL)

    Mass Air Flow Sensor

    Oil Pressure Warning Lamp

    Throttle Position Sensor

    Nissan Versa Sedan Service Manual / Engine / Engine control system (EC) / Engine control system / Heated Oxygen Sensor 2

    Nissan Versa Sedan Service Manual

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