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

Engine COOLANT Temperature Sensor

Check resistance between engine COOLANT temperature sensor terminals 1 and 2.

Fig 1: Testing Procedures To Verify Correct Engine COOLANT Temperature Sensor Resistance
Courtesy of NISSAN MOTOR CO., U.S.A.

Reference data

Fig 2: Engine COOLANT Temperature Sensor Specifications
Courtesy of NISSAN MOTOR CO., U.S.A.

For thermistor specifications in graph format, see Figure .
If NG, replace engine COOLANT temperature sensor.

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:

• 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.