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故障现象:一辆奔驰S320轿车,装用全电控自动变速器。在使用中却出现仅能一挡行驶故障,发动机工作正常。故障检查:由于该车仅能处于一挡模式,首先检查了自动变速器油无异常发现。接着用HHT检测仪进行检测,发现故障码的含义为转速传感故障。根据技术资料得知转速传感为霍尔感应式速度传感器,一般情况下,这种传感器工作信号稳定,性能可靠,不易造成故障。因此,先对外围线路做静态检查,结果外部无异常。
Symptoms: a Mercedes-Benz S320 sedan, equipped with full electronic control automatic transmission. In use, there is only one stop driving fault, and the engine is working normally. Troubleshooting: As the car can only be in a block mode, first check the automatic transmission oil found no abnormalities. Then use the HHT detector for testing and found that the meaning of the fault code for speed sensing fault. According to the technical information that the speed sensor Hall sensor speed sensor, under normal circumstances, the sensor signal stability, reliable performance, easy to cause failure. Therefore, the first static inspection of the external circuit, the results of the external no exception.