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What are the symptoms of a faulty motorcycle water temperature sensor?

1 Answers

OJameson

07/30/25 9:23am

Motorcycle water temperature sensor failure can cause the ECU to stop controlling the fuel injector, preventing the vehicle from starting when overheated. Below are the relevant details: 1. Resistance value of the water temperature sensor: For fuel-injected motorcycles, the water temperature sensor or engine temperature sensor typically has a resistance value of 2-3kΩ when the engine is cold and the ambient temperature is around 20℃. When the engine reaches 80℃, the sensor's resistance value should be between 200-400Ω. 2. Function of the temperature sensor: It continuously monitors the engine temperature and transmits this information to the ECU as an electrical signal. The ECU adjusts the fuel injection quantity (injection pulse width) based on changes in this signal. If the connection between the temperature sensor and the ECU is broken or short-circuited during signal transmission, most vehicle models' ECUs will automatically use a temperature map of either 80℃ or 100℃ to control fuel injection quantity and ignition timing. Air-cooled engines generally use 80℃, while water-cooled engines typically use 100℃.

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