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故障现象一辆2008款凯迪拉克CTS轿车(装备2.8L发动机),客户反映在正常行驶时驾驶人信息中心(DIC)显示“SERVICE STEERING SYS”(维修转向系统),并且出现转向沉重的现象,但将发动机熄火后再重新起动,上述故障现象就会消失。故障诊断首先用TECH 2进入EBCM(电子制动控制模块)内读取故障代码,调出的故障代码为C0450 OB——转向助力控制执行器电路电流高于阈值,当时故障为通过。再次进入冻结数据内查看,发现此故障一共出现了8次,故障出现时车速都在40km/h以上。
Symptom A 2008 Cadillac CTS sedan (equipped with a 2.8L engine) was reflected in the DIC showing “SERVICE STEERING SYS” during normal driving and heavy steering, However, the engine flameout and then restart, the above symptoms will disappear. Fault diagnosis First read the fault code with TECH 2 into the EBCM (Electronic Brake Control Module) and call out the fault code C0450 OB - The power steering actuator circuit current is above the threshold and the fault is passed. Check again into the frozen data and found that the failure occurred a total of 8 times, the speed of failure occurs at 40km / h or more.