What is the reason for the odometer not turning?

[Percy]

The reason for the odometer not turning is a damaged speed sensor and possible breakage of the transmission contact wire. Below is relevant information about automotive sensors: 1. Introduction: It is the input device of the automotive computer system, converting various operational conditions of the vehicle into electrical signals for the computer, ensuring the engine operates in the optimal state. There are many sensors in vehicles. When diagnosing sensor faults, one should not only consider the sensor itself but also the entire circuit where the fault occurs. Therefore, when troubleshooting, in addition to checking the sensor, it is also necessary to inspect the wiring harness, connectors, and related circuits between the sensor and the electronic control unit. 2. Types: Commonly used sensors in vehicles include wheel speed sensors, crankshaft/camshaft position sensors, temperature sensors, etc. With the continuous emergence of new vehicle models, each sensor with the same function has various differences in appearance. Coupled with increasingly stringent measurement indicators and production environment requirements, traditional single test workbenches cannot accommodate such diverse sensor production.