Component Description

MASS AIR FLOW SENSOR 

Mass air flow sensor is installed to the intake air path upstream of throttle and measures air flow rate.

Courtesy of NISSAN

This mass air flow sensor is a backflow-detecting film and silicon element type sensor that can detects air flow rate of both direct flow and backflow. This mass air flow sensor outputs an air flow rate by using frequency signals. The element part of this mass air flow sensor consists of a heater and temperature sensors installed to both top and bottom of the heater, one to each position. When air flows, the heat distribution around the heater changes and this produces a temperature difference between upstream and downstream. This temperature difference is detected as air flow rate.

Courtesy of NISSAN

INTAKE AIR TEMPERATURE SENSOR 

The intake air temperature sensor is built-into mass air flow sensor. The sensor detects intake air temperature and transmits a signal to the ECM. The temperature sensing unit uses a thermistor which is sensitive to the change in temperature. <Reference data>

*: These data are reference values on the diagnosis tool.