Engine Intake Air Temperature Sensor Circuit
Issues with the engine intake air temperature sensor circuit.
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What it means (plain English)
The engine has a sensor that measures how hot the air entering the engine is. If this sensor isn't working, the engine computer can't get the right data to adjust fuel and air mix properly.
What the computer is actually seeing
The engine control unit (ECU) checks the intake air temperature through a sensor. If the voltage from the sensor falls outside the expected range, it triggers this fault code. The normal operating voltage is typically between 0.5 to 4.5 volts, depending on temperature.
What a healthy reading looks like
Intake air temperature should be between -40°C to 125°C (-40°F to 257°F). Voltage output from the sensor should be around 0.5V at -40°C and increase to around 4.5V at 125°C.
Guided diagnostic — the DiagCoach way
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.
- 11. Check the wiring and connector for the intake air temperature sensor. Look for frays, corrosion, or loose connections. Decision: If wiring is damaged, repair it. If wiring is good, proceed to step 2.
- 22. Use a multimeter to measure the voltage output from the intake air temperature sensor with the ignition on but engine off. It should be close to the expected values. Decision: If voltage is out of range, replace the sensor. If voltage is within range, proceed to step 3.
- 33. Start the engine and monitor the intake air temperature with a scan tool. Compare the reading to ambient temperature. Decision: If readings are significantly off, the sensor may be faulty. If readings are correct, check the ECU for potential issues.
Common causes
- Faulty intake air temperature sensor
- Damaged wiring or connectors
- ECU issues
- Contaminated sensor
- Air leaks in intake system
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's generally drivable, but performance may be affected and fuel efficiency could decrease.
Will this error code come back after clearing it?
If the underlying issue isn't fixed, yes, the code will likely return.
Why do I see this code with other faults?
Multiple faults can indicate a larger issue with the intake air system or the ECU itself.
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