2014 Infiniti Q50 Base, AWDFACTORY OEM SERVICE PROCEDURE

Intake Air Temperature Sensor

The intake air temperature sensor is built-into the mass air flow sensor (1). 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. Electrical resistance of the thermistor decreases in response to the rise in temperature.

Fig 1: Identifying Intake Air Temperature Sensor
G09159935Courtesy of NISSAN NORTH AMERICA, INC.
TEMPERATURE RESISTANCE REFERENCE DATA

Intake air temperature [Β°C (Β°F)] Voltage(1) (V) Resistance (kΞ©)
25 (77) 3.3 1.800 - 2.200
80 (176) 1.2 0.283 - 0.359
(1) These data are reference values and are measured between ECM terminals 67 (Intake air temperature sensor) and 68 (Sensor ground).
Fig 2: Intake Air Temperature Sensor Resistance Graph
G09159936Courtesy of NISSAN NORTH AMERICA, INC.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.

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