The culprit is… Coolant Temperature Sensor (known as “Electronic Plug”). When it malfunctions, it sends an incorrect reading to the ECU (Control Unit).
- The Problem of the Game: If the sensor malfunctions, sending information that the engine is… 80°C (when in fact he is) 20°C On a cold morning, the control unit does not inject the extra amount of fuel needed for a cold engine. The result is the car either refusing to start or starting and then stalling immediately.
- Safe Mode: If the sensor short-circuits, the control unit, as a precaution, assumes that the car may be overheating. As a protective measure, it activates the fan at maximum speed It can immediately cause the “STOP” light to come on on the dashboard, even with the engine cold.
- Butterfly Body (TBI): Often, mechanics clean the throttle body thinking it’s dirt, but the sensor reading error continues to prevent a perfect start.
Location of Protection (Fuses): Although the sensor is a signal component, it is powered by BSM (under the hood) through the engine management circuit.
- Correct Fuse: Usually shared with F10 or F15 (15A) from BSM. If this fuse blows, the car will not have a temperature reading and will not start.
Technical Tip: There is a piece called Thermostat Valve Housing In newer models, the sensor connector is made of plastic and often leaks water directly onto the connector, causing oxidation (verdigris). Always check for any remaining additive (pink or green) around the sensor.
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