Intake air temperature sensor - IAT
How the intake air temperature sensor works:
The intake air temperature sensor determines the temperature in the intake duct and transmits voltage signals from the temperature to the control unit. This evaluates the signals and influences the mixture formation and draft angle.
The resistance of the temperature sensor changes according to the inlet air temperature. As the temperature increases, the resistance decreases, which reduces the voltage at the sensor. The control unit evaluates these voltage values because they are directly related to the temperature of the intake air (low temperatures result in high voltage values at the sensor and high temperatures result in low voltage values).
Symptoms of faulty intake air temperature sensor:
A faulty intake air temperature sensor can manifest itself in different ways through fault detection by the control unit and the resulting emergency program strategy.
Common error symptoms are:
- Error code is stored, engine control lamp may light up
- Startup problems
- Reduced engine power
- Increased fuel consumption
Causes of a faulty IAT sensor:
- Internal short circuits
- Break in wiring
- Wiring short circuit
- Mechanical damage
- Dirty sensor tip
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