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.
Sensor, Temperature, Intake Manifold: Operation
A Negative Temperature Coefficient (NTC) resistor integrated in the fuel temperature sensor alters its electrical resistance in line with the fuel temperature (the resistance drops as the temperature rises). The Powertrain Control Module (PCM) uses this reading to calculate optimum engine performance under all driving conditions. If the fuel temperature is high, fuel rail pressure in the system is reduced. The controller quantity of the pressure regulating valve is reduced and the fuel temperature is reduced.
The NTC resister located within the intake air temperature sensor alters it's resistance in line with the charge air temperature. If the engine is cold, the value equals ambient temperature.
| Temperature | Resistance Value |
|---|---|
| 32°F (0°C) | 31202.3Ω |
| 140°F (60°C) | 2314.6Ω |
| 194°F (90°C) | 878.4Ω |
| 248°F (120°C) | 389.0Ω |
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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.