Nissan and Datsun Workshop Service and Repair Manuals

Oxygen Sensor: Description and Operation

HO2S1 HEATER

System Description

Operation

Description

The ECM performs ON/OFF duty control of the heated oxygen sensor 1 heater corresponding to the engine speed and engine coolant temperature. The
duty percent varies with engine coolant temperature when engine is started.

HO2S2 HEATER

System Description

Operation

Description

HO2S1