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故障现象:一辆2014款别克君越轿车,行驶里程8?659km,客户反映TC灯点亮,牵引力控制系统失效。故障诊断与排除:连接MDI诊断仪,打开GDS2软件,调取DTC信息如表1所示,发现DTC全是和底盘CAN网络总线有关的故障码。断开蓄电池负极电缆,用万用表测量DLC(诊断接口)的12#和13#之间的电阻为120Ω,正常情况下应为60Ω。说明电路中有一侧的终端电阻断路,查阅相关电路(图1),决定从方向盘转角位置传感器处进行侵入式诊断。
Symptom: A 2014 Buick LaCrosse sedan, mileage 8? 659km, the customer reflects the TC lights, traction control system failure. Fault diagnosis and troubleshooting: connect the MDI diagnostic tool, open the GDS2 software, retrieve the DTC information as shown in Table 1 and find that the DTC is all the fault code related to the CAN network bus of the chassis. Disconnect the battery negative cable and measure the resistance between 12 # and 13 # of the DLC (diagnostic interface) with a multimeter to 120Ω, which should normally be 60Ω. Description of the circuit side of the terminal resistance circuit, refer to the relevant circuit (Figure 1), the decision from the steering wheel position sensor for invasive diagnosis.