故障现象一辆蒙迪欧2.0 L车,累计行驶里程约为16万km,车辆因发动机无法起动进店维修。故障排除接车后,起动发动机时,起动机运转有力,但是接通点火开关时,听不到主继电器吸合的声音,也听不到燃油泵的运转声。仔细检查相关熔丝,发现乘客侧熔丝盒中的熔丝F67(图1)熔断。更换熔丝F67后,试车发现该熔丝再次熔断,怀疑相关线路有短路现象。查看相关电路图后,拔掉熔丝F67,用试灯代替,试灯点亮说明线路确实存在短路现象。断开经过熔 Symptom A Mondeo 2.0 L car, the cumulative mileage of about 160,000 km, the vehicle can not be started because the engine into the store maintenance. Troubleshooting After starting the engine after starting the engine, the starter is powerful, but when the ignition is switched on, the main relay does not hear the sound of the main relay and the operation of the fuel pump can not be heard. Carefully examine the fuse and find fuse F67 (Figure 1) in the passenger-side fuse box blown. Replace the fuse F67, the test found that the fuse blown again, suspected short circuit related lines. See the relevant circuit diagram, unplug the fuse F67, with the test light instead, the test light is lit, indicating that the circuit does exist short-circuit phenomenon. Disconnect through the melt