Air Fuel Ratio Sensor And Heated Oxygen Sensor Construction; Mass Air Flow Meter - Toyota 1NZ-FE User Manual

2) Construction
D The basic construction of the air fuel ratio sensor and heated oxygen sensor is the same. However, they
are divided into the cup type and the planar type, according to the different types of heater construction
that are used.
D The cup type sensor contains a sensor element that surrounds a heater.
D The planer type sensor uses alumina, which excels in heat conductivity and insulation, to integrate a
sensor element with a heater, thus realizing the excellent warm-up performance of the sensor.
Dilation Layer
Alumina
Platinum
Electrode
Planer Type Air Fuel Ratio Sensor
"
Warm-up Specification
Sensor Type
Warm-up Time

Mass Air Flow Meter

D The compact and lightweight mass air flow meter, which is a plug-in type, allows a portion of the intake
air to flow through the detection area. By directly measuring the mass and the flow rate of the intake air,
the detection precision is ensured and the intake air resistance is reduced.
D This mass air flow meter has a built-in intake air temperature sensor.
Temperature Sensing
Element
Platinum Hot-wire
Element
ENGINE - 1NZ-FE ENGINE
Alumina
Atmosphere
Heater
Sensor Element (Zirconia)
A
Planer
Approx. 10 sec.
Air Flow
Heater
Platinum
Electrode
Sensor Element
(Zirconia)
Cup Type Heated Oxygen Sensor
Cup Type
Approx. 30 sec.
Intake Air
Temperature Sensor
EG-33
Atmosphere
271EG45
204EG54