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故障现象一辆2006款日产天籁J31轿车(搭载2.3 LV6发动机),累计行驶里程约为18.5万km,出现在行驶过程中车速里程表不工作的故障的现象。故障诊断首先分析该款天籁车的车速里程表的工作原理。该车的ABS轮速传感器传送一个轮速信号给ABS控制单元,并通过CAN通讯线路向一体化仪表和A/C放大器提供一个车速信号。一体化仪表和A/C放大器接收到车速信号后,将此信号转变为一个8脉冲信号,并将这个8脉冲信号提供给仪表中的车速里程表。接车后首先进行试车,发现故障现象确实存在。接着按
Trouble phenomenon A 2006 Nissan Teana J31 sedan (equipped with 2.3 LV6 engine), the cumulative mileage of about 185000 km, appeared in the driving speedometer does not work the phenomenon of failure. Fault diagnosis First of all, analyze the working principle of the speedometer of this car. The car’s ABS wheel speed sensor transmits a wheel speed signal to the ABS control unit and provides a speed signal to the integrated meter and A / C amplifier via the CAN communication line. Upon receipt of the vehicle speed signal from the integrated meter and A / C amplifier, the signal is converted into an 8-pulse signal and the 8-pulse signal is provided to the speedometer in the meter. Take the car after the first test drive and found the fault does exist. Then press