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.
Air Pressure And Air Temperature Sensor 1
The component is a combined sensor and contains two sensors in the same component:
- air pressure sensor
- temperature sensor
The sensor is located on the upper part of the charge air cooler.
air pressure sensor
The air pressure sensor measures the pressure in the intake pipe after the charge air cooler, ahead of the throttle unit. The signal from the sensor is primarily used by the Engine Control Module (ECM) to control turbo regulation, as well as to check other air pressure sensors in certain positions.
The sensor, which is an Piezo resistive resistor, is grounded in the control module and supplied with power (5 V) from the control module.
Depending on the pressure, the silicone membrane in the sensor moves which changes the resistance, and thus varies the voltage level of the analogue signal to the control module.
For information about electrical connection, see wiring diagram. For sensor characteristics and normal values, see signal specification and component specification.
The boost pressure sensor can be diagnosed by the Engine Control Module (ECM) and the sensor signal can be read off.
temperature sensor
The temperature sensor measures the temperature of the intake air after the charge air cooler, ahead of the throttle unit.
The information is used by Engine Control Module (ECM) to calculate boost pressure control, as well as for calculating injection time. The control module also controls certain diagnostic functions using the temperature sensor's signal.
The sensor, which is an NTC resistor, is grounded in the control module and supplied with power (signal) from the control module.
The resistance in the sensor changes according to the temperature of the intake air.
For information about electrical connection, see wiring diagram. For sensor characteristics and normal values, see signal specification and component specification.
The temperature sensor can be diagnosed by the Engine Control Module (ECM) and the sensor signal can be read off.
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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.
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