宇通客车发动机限转速故障排除

Troubleshooting of Engine Limiting Speed for Yutong Coaches

某型宇通客车因发动机限转速而工作无力,经排查是ECU程序的问题,复制同样车型的ECU程序后,又发现高压共轨上的泄压阀有故障,更换共轨总成后才彻底解决了故障。

A Type of Yutong coach lacks force when working due to its engine speed limiting.Through the screening,it is an ECU program problem.After copying the ECU program from the same type coach,the authors withal find the pressure relief valve on the common rail has fault.The fault is completely resolved after the common rail assembly replaced.