What are the symptoms of a faulty motorcycle coolant temperature sensor?
2 Answers
When the coolant temperature sensor malfunctions (usually due to poor contact, short circuit, or open circuit, with poor contact being the most common), the symptoms include: the engine warning light staying on when in the ON position, and the temperature gauge constantly displaying the maximum value of 120 degrees Celsius. A faulty coolant temperature sensor can also cause difficulties in cold starting, abnormal fuel delivery, lack of power during acceleration, and backfiring during sudden acceleration. Below is additional information: Function of the temperature sensor: It continuously monitors the engine temperature and transmits the data to the ECU in the form of an electrical signal. The ECU adjusts the fuel injection quantity (injection pulse width) based on changes in the electrical signal. Issues such as open or short circuits in the wiring between the temperature sensor and the ECU can disrupt this signal transmission. Installation location: Generally, the engine temperature sensor is installed on the cylinder or cylinder head. For water-cooled engines, it is installed in the cooling system.
That day I was riding my motorcycle home when the temperature gauge suddenly got stuck. At first, I thought it was a minor issue and didn't pay much attention, but then the engine started emitting white smoke halfway, and the fan made no sound at all. Later, when I went to get it repaired, I learned that a faulty temperature sensor can cause all sorts of trouble: the gauge displays false readings, making you think the temperature is normal while the engine is secretly overheating; the fan control malfunctions, potentially not turning on when it should, leading to overheating, or running constantly and draining the battery. Long-term neglect can even damage the cylinders—I almost blew the cylinder head that time. I recommend fellow riders regularly check the coolant and wiring connections. These small components may seem insignificant, but they can save you a lot of money when it matters most.