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故障现象一辆一汽丰田卡罗拉GL轿车(发动机型号为1ZR),出现发动机故障灯常亮,发动机加速不良,发动机转速被限制在3000 r/min左右(即ECM进入实效保护模式)的现象。故障诊断接车后用故障检测仪读取故障代码,读得的故障代码为P2128,其含义是节气门/加速踏板位置传感器开关E电路高输入。查阅维修手册,得知该故障代码与加速踏板位置传感器及其相关电路有关。加速踏板位置传感器安装在加速踏板支架上,并有2个传感器电路——VPA(主)和VPA2(副)。该传感器为非接触型,使用霍尔元件,以便在极端的行驶条件下(例如高速及
Fault phenomenon A FAW Toyota Corolla GL sedan (engine model 1ZR), the engine fault light always bright, poor engine acceleration, the engine speed is limited to 3000 r / min or so (that ECM into the actual protection mode) phenomenon. Fault Diagnosis After reading the car with a fault detector to read the fault code, read the fault code P2128, the meaning of the throttle / accelerator pedal position sensor switch E circuit high input. Check out the service manual and learn that the fault code is related to the accelerator pedal position sensor and its associated circuitry. The accelerator pedal position sensor is mounted on the accelerator pedal bracket and has two sensor circuits - VPA (main) and VPA2 (secondary). The sensor is non-contact type, using Hall elements, so that under extreme driving conditions (such as high-speed and