Intake Air Temperature Sensor 1

The intake air temperature sensor measures how hot the air entering the engine is, which helps the computer adjust engine performance for fuel and air mixture based on that temperature.

The engine control module (ECM) expects a voltage signal from the intake air temperature sensor typically between 0.5V to 4.5V, corresponding to temperature readings from -40°C to +125°C (-40°F to +257°F).

Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.

1. 11. Inspect the wiring and connector at the intake air temperature sensor. Look for frays, corrosion, or loose connections. If damaged, repair or replace as necessary. Decision: If wiring is damaged, fix it. If wiring is good, go to step 2.
2. 22. Using a multimeter, check the voltage signal from the sensor while the engine is running. It should be between 0.5V and 4.5V, varying with temperature. Decision: If voltage is outside this range, replace the sensor. If voltage is correct, go to step 3.
3. 33. Clear the fault code and run the engine to see if the code returns. Monitor the intake air temperature sensor readings on a scan tool. Decision: If code comes back, replace the intake air temperature sensor; if not, further diagnosis may be needed for other issues.

• Faulty intake air temperature sensor
• Wiring issues or shorts to ground
• Connector corrosion or loose connection
• Intake air duct leaks or obstructions
• ECM software issue

$$ – $150-$400