Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2004 Infiniti FX45FACTORY OEM SERVICE PROCEDURE
Intake Air Temperature Sensor
- Check resistance between intake air temperature sensor terminals 5 and 6. Intake air temperature 77° F (25° C) Specified resistance is 1.9-2.1 Kohm.
- If NG, replace mass air flow sensor (with intake air temperature sensor).
For mass air flow sensor & intake air temperature sensor location, see Figure and Figure .
For thermistor specifications in graph format, see Figure .
Factory Service Tools
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.