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一辆欧曼GTL牵引车,配备康明斯ISM11E4发动机,出现故障代码1699——尿素液位传感器数据不稳定、间断或不正确,且SCR系统关闭、停止尿素喷射。断开尿素液位传感器连接器,接通点火开关,测量尿素液位传感器的端子1和端子2之间的电压,为0V(正常应为5 V±0.25 V),说明有导线断路或ECM内部故障。进一步检测相关导线的导通性,正常;断开ECM连接器,检测端子ECM/53对搭铁的电阻为∞;检查ECM搭铁良好。经以上检测确认ECM内部下拉电阻断路。康明斯ISM 11E4发动机配备了SCR(选择性还原尾气
An Auman GTL Tractor with Cummins ISM11E4 engine, error code 1699 - Urea level sensor data is unstable, intermittent or incorrect, and the SCR system is shut down to stop urea injection. Disconnect the urea level sensor connector and turn the ignition switch on to measure the voltage between terminals 1 and 2 of the urea level sensor at 0V (5 V ± 0.25 V, as normal), indicating a wire break or internal ECM malfunction. Further test the continuity of the relevant wire, normal; Disconnect the ECM connector, the resistance of the terminal ECM / 53 to ground is ∞; check the ECM to ground well. After the above test to confirm ECM internal pull-down resistance circuit. Cummins ISM 11E4 engine is equipped with SCR (selective reduction tail gas