案例1迈腾轿车行驶中EPC灯点亮,急加速反应慢,缓加速尚可故障现象一辆迈腾轿车,行驶中EPC灯点亮(图1),急加速反应慢,缓加速尚可。故障诊断检查发现,发动机控制单元(J623)中存储有故障代码08504(图2),其含义是节气门/加速踏板位置传感器/开关D/E电压相关性。断开电子节气门体导线连接器,系统报的故障是开关A/B低信号;断开加速踏板位置传感器导线连接器,系统报的故障是开关D/E低信号,这说明 Case 1 MAGOTAN car driving EPC lamp lit, rapid acceleration response slow, slow acceleration can still breakdown phenomenon A MAGOTAN car, running EPC lamp light (Figure 1), rapid acceleration response is slow, slow acceleration is acceptable. The troubleshooting check shows that the engine control unit (J623) has stored fault code 08504 (Figure 2), which implies the throttle / accelerator pedal position sensor / switch D / E voltage dependency. Disconnect the electronic throttle body wire connector, the system reported fault is the switch A / B low signal; disconnect the accelerator pedal position sensor wire connector, the system reported fault is the switch D / E low signal, indicating that