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.
Cooler Temperature Sensor
The cooler has an integrated temperature sensor with logic. Engine control module (ECM) communicates continuously with the sensor via LIN.
The purpose of the sensor is to ensure that the cooler is of the correct type for the vehicle. This means that the cooler has a coating done according to the Premair-technology and thus has a reducing effect on ground-level ozone. The technology means, in short, that some of the ozone that passes through the cooler is converted to oxygen.
If communication with the sensor cannot take place correctly, the diagnostic system signals in the Engine control module (ECM) for emission control, since the cooler's function no longer can be ensured.
Also, the control module evaluates temperature changes on the cooler in relation to other temperature sensors' signals during specific conditions. For example, during engine warm-up/cooling. This check is also done to ensure the cooler's type and function.
The cooler temperature sensor can be diagnosed by Engine control module (ECM).
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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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